diff --git a/archive/genai-toolkit/agy-chat-export-202609251720.md b/archive/genai-toolkit/agy-chat-export-202609251720.md
new file mode 100644
index 0000000..31ca30b
--- /dev/null
+++ b/archive/genai-toolkit/agy-chat-export-202609251720.md
@@ -0,0 +1,847 @@
+# Antigravity CLI Transcript
+
+### Developer (9/25/2026, 9:18:21 AM)
+
+
+I am trying to run @[java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java] in Google Cloud Shell Editor via the Java extension but I am getting the following errors, can you help me debug the problem?
+
+Exception in thread "main" java.lang.Error: Unresolved compilation problems:
+ The constructor BSTNode() is undefined
+ The method BSTNode(BSTNode) is undefined for the type BST
+ The method BSTNode(BSTNode) is undefined for the type BST
+
+ at dev.andreijiroh.studentops.projects.dsaLabs.BST.(BST.java:10)
+ at dev.andreijiroh.studentops.projects.dsaLabs.BSTMain.main(BSTMain.java:11)
+
+
+The current local time is: 2026-09-25T09:18:21Z.
+
+The user has mentioned some items in the form @[ITEM]. Here is extra information about the items that were mentioned by the user, in the order that they appear:
+
+@[java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java] is a [File]:
+/home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
+
+
+The user changed setting `Model Selection` from None to Gemini 3.8 Flash (High). No need to comment on this change if the user doesn't ask about it. If reporting what model you are, please use a human readable name instead of the exact string.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:26 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:26 AM)
+
+Created At: 2026-09-25T09:18:26Z
+Completed At: 2026-09-25T09:18:27Z
+Found 3 results
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:40 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:40 AM)
+
+Created At: 2026-09-25T09:18:40Z
+Completed At: 2026-09-25T09:18:41Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java`
+Total Lines: 97
+Total Bytes: 1893
+Showing lines 1 to 97
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: /**
+4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+5: *
+6: * @author Andrei Jiroh Halili (STI College Meycauayan)
+7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+8: */
+9: class BST {
+10: BSTNode root = new BSTNode();
+11:
+12: public void insert(int key) {
+13: root = insertRec(root, key);
+14: }
+15:
+16: private BSTNode insertRec(BSTNode n, int k) {
+17: if (n == null) {
+18: return new BSTNode(k);
+19: };
+20:
+21: if (k < n.key) {
+22: n.left = insertRec(n.left, k);
+23: } else if (k > n.key) {
+24: n.right = insertRec(n.right, k);
+25: };
+26:
+27: return BSTNode(n);
+28: }
+29:
+30: public boolean search(BSTNode n, int k) {
+31: if (n == null) {
+32: return false;
+33: }
+34:
+35: if (n.key == k) {
+36: return true;
+37: }
+38:
+39: if (k < n.key) {
+40: return search(n.left, k);
+41: } else {
+42: return search(n.right, k);
+43: }
+44: }
+45:
+46: public void deleteKey(int key) {
+47: root = deleteRec(root, key);
+48: }
+49:
+50: private BSTNode deleteRec(BSTNode n, int k) {
+51: if (n == null) {
+52: return new BSTNode(k);
+53: };
+54:
+55: if (k < n.key) {
+56: n.left = deleteRec(n.left, k);
+57: } else if (k > n.key) {
+58: n.right = deleteRec(n.right, k);
+59: } else {
+60: if (n.left == null) {
+61: return n.right;
+62: }
+63:
+64: if (n.right == null) {
+65: return n.left;
+66: }
+67:
+68: n.key = minValue(n.right);
+69:
+70: n.right = deleteRec(n.right, n.key);
+71: };
+72:
+73: return BSTNode(n);
+74: }
+75:
+76:
+77: private int minValue(BSTNode n) {
+78: while (n.left != null) {
+79: n = n.left;
+80: }
+81:
+82: return n.key;
+83: }
+84:
+85: public void inorderPrint() {
+86: inorder(root);
+87: System.out.println();
+88: }
+89:
+90: private void inorder(BSTNode n) {
+91: if (n != null) {
+92: inorder(n.left);
+93: System.out.print(n.key + " ");
+94: inorder(n.right);
+95: }
+96: }
+97: }
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:57 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:18:57 AM)
+
+Created At: 2026-09-25T09:18:57Z
+Completed At: 2026-09-25T09:19:01Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java`
+Total Lines: 20
+Total Bytes: 509
+Showing lines 1 to 20
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: /**
+4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+5: *
+6: * @author Andrei Jiroh Halili (STI College Meycauayan)
+7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+8: */
+9: class BSTNode {
+10: int key;
+11: BSTNode left;
+12: BSTNode right;
+13:
+14: BSTNode(int key) {
+15: this.key = key;
+16: left = null;
+17: right = null;
+18: }
+19: }
+20:
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:03 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:03 AM)
+
+Created At: 2026-09-25T09:19:03Z
+Completed At: 2026-09-25T09:19:03Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java`
+Total Lines: 21
+Total Bytes: 572
+Showing lines 1 to 21
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: /**
+4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+5: *
+6: * @author Andrei Jiroh Halili (STI College Meycauayan)
+7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+8: */
+9: public class BSTMain {
+10: public static void main(String[] args) {
+11: BST t = new BST();
+12: int[] vals = {50,30,70,20,40,60,80};
+13:
+14: for (int v : vals) {
+15: t.insert(v);
+16: }
+17:
+18: t.inorderPrint();
+19: }
+20: }
+21:
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:08 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:08 AM)
+
+Created At: 2026-09-25T09:19:08Z
+Completed At: 2026-09-25T09:19:08Z
+Found 74 results
+ComProg1.iml
+build
+build.xml
+manifest.mf
+nbproject
+nbproject/build-impl.xml
+nbproject/genfiles.properties
+nbproject/private
+nbproject/private/private.properties
+nbproject/private/private.xml
+nbproject/project.properties
+nbproject/project.xml
+src
+src/dev
+src/dev/andreijiroh
+src/dev/andreijiroh/studentops
+src/dev/andreijiroh/studentops/archive
+src/dev/andreijiroh/studentops/archive/BloodData.java
+src/dev/andreijiroh/studentops/archive/RunBloodData.java
+src/dev/andreijiroh/studentops/archive/main2_20260326.java
+src/dev/andreijiroh/studentops/archive/main_20260326.java
+src/dev/andreijiroh/studentops/projects
+src/dev/andreijiroh/studentops/projects/BarbershopService.java
+src/dev/andreijiroh/studentops/projects/CarDemo.java
+src/dev/andreijiroh/studentops/projects/ComProg2_Lab1.java
+src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v1.java
+src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v2.java
+src/dev/andreijiroh/studentops/projects/ComProg2_Lab2_v3.java
+src/dev/andreijiroh/studentops/projects/ComProg2_Lab3_p1.java
+src/dev/andreijiroh/studentops/projects/ComProg2_PT1_v1.java
+src/dev/andreijiroh/studentops/projects/ComProg2_PT1_v2.java
+src/dev/andreijiroh/studentops/projects/ComProgActivity1.java
+src/dev/andreijiroh/studentops/projects/ComProgActivity2.java
+src/dev/andreijiroh/studentops/projects/ComProgPETA_netPay.java
+src/dev/andreijiroh/studentops/projects/CreateBarbershop.java
+src/dev/andreijiroh/studentops/projects/DivideDemo.java
+src/dev/andreijiroh/studentops/projects/DivideDemo_v2.java
+src/dev/andreijiroh/studentops/projects/DivisionMistakeCaught.java
+src/dev/andreijiroh/studentops/projects/PETA_6_20260416.java
+src/dev/andreijiroh/studentops/projects/PETA_labs_20260326_activity1.java
+src/dev/andreijiroh/studentops/projects/PETA_labs_20260326_activity2.java
+src/dev/andreijiroh/studentops/projects/ThreadActivity.java
+src/dev/andreijiroh/studentops/projects/calucatorPrompts.java
+src/dev/andreijiroh/studentops/projects/dsaLabs
+src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
+src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java
+src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java
+src/dev/andreijiroh/studentops/projects/dsaLabs/Node.java
+(...24 more results not shown)
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:11 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:11 AM)
+
+Created At: 2026-09-25T09:19:11Z
+Completed At: 2026-09-25T09:19:12Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java`
+Total Lines: 63
+Total Bytes: 1399
+Showing lines 1 to 63
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: import java.util.ArrayDeque;
+4: import java.util.ArrayList;
+5: import java.util.List;
+6: import java.util.Queue;
+7:
+8: /**
+9: * @author Andrei Jiroh Halili (STI College Meycauayan)
+10: * @see @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BinaryTree.java
+11: */
+12: class BinaryTree {
+13: Node root;
+14:
+15: public void inorder(Node n, List out) {
+16: if (n == null) {
+17: return;
+18: }
+19: inorder(n.left, out);
+20: out.add(n.data);
+21: inorder(n.right, out);
+22: }
+23:
+24: public void preorder(Node n, List out) {
+25: if (n == null) {
+26: return;
+27: }
+28: out.add(n.data);
+29: preorder(n.left, out);
+30: preorder(n.right, out);
+31: }
+32:
+33: public void postorder(Node n, List out) {
+34: if (n == null) {
+35: return;
+36: }
+37: postorder(n.left, out);
+38: postorder(n.right, out);
+39: out.add(n.data);
+40: }
+41:
+42: public List levelOrder (Node n) {
+43: List out = new ArrayList<>();
+44: if (n == null) {
+45: return out;
+46: };
+47:
+48: Queue q = new ArrayDeque<>();
+49: q.add(n);
+50:
+51: while (!q.isEmpty()) {
+52: Node cur = q.remove();
+53: out.add(cur.data);
+54: if (cur.left != null) {
+55: q.add(cur.left);
+56: }
+57: if (cur.right != null) {
+58: q.add(cur.right);
+59: }
+60: }
+61: return out;
+62: }
+63: }
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:16 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:16 AM)
+
+Created At: 2026-09-25T09:19:16Z
+Completed At: 2026-09-25T09:19:26Z
+
+The command exited with code 1.
+Output:
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:10: error: constructor BSTNode in class BSTNode cannot be applied to given types;
+ BSTNode root = new BSTNode();
+ ^
+ required: int
+ found: no arguments
+ reason: actual and formal argument lists differ in length
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:27: error: cannot find symbol
+ return BSTNode(n);
+ ^
+ symbol: method BSTNode(BSTNode)
+ location: class BST
+java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java:73: error: cannot find symbol
+ return BSTNode(n);
+ ^
+ symbol: method BSTNode(BSTNode)
+ location: class BST
+3 errors
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:32 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:33 AM)
+
+Created At: 2026-09-25T09:19:33Z
+Completed At: 2026-09-25T09:19:33Z
+
+The command exited with code 0.
+Output:
+On branch main
+Your branch is up to date with 'origin/main'.
+
+Untracked files:
+ (use "git add ..." to include in what will be committed)
+ IncidentManagement.java
+ java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+ java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
+ java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+
+nothing added to commit but untracked files present (use "git add" to track)
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:38 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:39 AM)
+
+Created At: 2026-09-25T09:19:39Z
+Completed At: 2026-09-25T09:19:39Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java`
+Total Lines: 41
+Total Bytes: 1230
+Showing lines 1 to 41
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: import java.util.ArrayList;
+4: import java.util.List;
+5:
+6: /**
+7: * @author Andrei Jiroh Halili (STI College Meycauayan)
+8: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BTMain.java
+9: */
+10: public class BTMain {
+11: public static void main(String[] args) {
+12: /**
+13: * Initialize the root node first
+14: */
+15: BinaryTree t = new BinaryTree();
+16: t.root = new Node(10);
+17: t.root.left = new Node(5);
+18: t.root.left.left = new Node(2);
+19: t.root.left.right = new Node(7);
+20: t.root.right = new Node(15);
+21: t.root.right.left = new Node(12);
+22:
+23: /**
+24: * Then the empty lists
+25: */
+26: List in = new ArrayList<>();
+27: List pre = new ArrayList<>();
+28: List post = new ArrayList<>();
+29: List level = new ArrayList<>();
+30:
+31: t.inorder(t.root, in);
+32: t.preorder(t.root, pre);
+33: t.postorder(t.root, post);
+34: level = t.levelOrder(t.root);
+35:
+36: System.out.println("Inorder: "+in);
+37: System.out.println("Preorder: "+pre);
+38: System.out.println("Postorder: "+post);
+39: System.out.println("Level order: "+level);
+40: }
+41: }
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:46 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:19:48 AM)
+
+Created At: 2026-09-25T09:19:48Z
+Completed At: 2026-09-25T09:19:59Z
+The following changes were made by the replace_file_content tool to: /home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java. If relevant, proactively run terminal commands to execute this code for the USER. Don't ask for permission.
+[diff_block_start]
+@@ -7,7 +7,7 @@
+ * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+ */
+ class BST {
+- BSTNode root = new BSTNode();
++ BSTNode root;
+
+ public void insert(int key) {
+ root = insertRec(root, key);
+@@ -23,7 +23,7 @@
+ n.right = insertRec(n.right, k);
+ };
+
+- return BSTNode(n);
++ return n;
+ }
+
+ public boolean search(BSTNode n, int k) {
+@@ -47,7 +47,7 @@
+
+ private BSTNode deleteRec(BSTNode n, int k) {
+ if (n == null) {
+- return new BSTNode(k);
++ return null;
+ };
+
+ if (k < n.key) {
+@@ -67,7 +67,7 @@
+ n.right = deleteRec(n.right, n.key);
+ };
+
+- return BSTNode(n);
++ return n;
+ }
+
+
+[diff_block_end]
+
+Please note that the above snippet only shows the MODIFIED lines from the last change. It shows up to 3 lines of unchanged lines before and after the modified lines. The actual file contents may have many more lines not shown.
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:11 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:11 AM)
+
+Created At: 2026-09-25T09:20:11Z
+Completed At: 2026-09-25T09:20:20Z
+
+The command exited with code 0.
+Output:
+20 30 40 50 60 70 80
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:23 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:23 AM)
+
+Created At: 2026-09-25T09:20:23Z
+Completed At: 2026-09-25T09:20:29Z
+
+The command exited with code 0.
+Stdout:
+
+Stderr:
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:33 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:33 AM)
+
+Created At: 2026-09-25T09:20:33Z
+Completed At: 2026-09-25T09:20:33Z
+
+The command exited with code 0.
+Stdout:
+
+Stderr:
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:36 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:36 AM)
+
+Created At: 2026-09-25T09:20:36Z
+Completed At: 2026-09-25T09:20:36Z
+
+The command exited with code 0.
+Output:
+?? IncidentManagement.java
+?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
+?? java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:39 AM)
+
+undefined
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:39 AM)
+
+Created At: 2026-09-25T09:20:39Z
+Completed At: 2026-09-25T09:20:39Z
+File Path: `file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java`
+Total Lines: 97
+Total Bytes: 1849
+Showing lines 1 to 97
+The following code has been modified to include a line number before every line, in the format: : . Please note that any changes targeting the original code should remove the line number, colon, and leading space.
+1: package dev.andreijiroh.studentops.projects.dsaLabs;
+2:
+3: /**
+4: * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+5: *
+6: * @author Andrei Jiroh Halili (STI College Meycauayan)
+7: * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+8: */
+9: class BST {
+10: BSTNode root;
+11:
+12: public void insert(int key) {
+13: root = insertRec(root, key);
+14: }
+15:
+16: private BSTNode insertRec(BSTNode n, int k) {
+17: if (n == null) {
+18: return new BSTNode(k);
+19: };
+20:
+21: if (k < n.key) {
+22: n.left = insertRec(n.left, k);
+23: } else if (k > n.key) {
+24: n.right = insertRec(n.right, k);
+25: };
+26:
+27: return n;
+28: }
+29:
+30: public boolean search(BSTNode n, int k) {
+31: if (n == null) {
+32: return false;
+33: }
+34:
+35: if (n.key == k) {
+36: return true;
+37: }
+38:
+39: if (k < n.key) {
+40: return search(n.left, k);
+41: } else {
+42: return search(n.right, k);
+43: }
+44: }
+45:
+46: public void deleteKey(int key) {
+47: root = deleteRec(root, key);
+48: }
+49:
+50: private BSTNode deleteRec(BSTNode n, int k) {
+51: if (n == null) {
+52: return null;
+53: };
+54:
+55: if (k < n.key) {
+56: n.left = deleteRec(n.left, k);
+57: } else if (k > n.key) {
+58: n.right = deleteRec(n.right, k);
+59: } else {
+60: if (n.left == null) {
+61: return n.right;
+62: }
+63:
+64: if (n.right == null) {
+65: return n.left;
+66: }
+67:
+68: n.key = minValue(n.right);
+69:
+70: n.right = deleteRec(n.right, n.key);
+71: };
+72:
+73: return n;
+74: }
+75:
+76:
+77: private int minValue(BSTNode n) {
+78: while (n.left != null) {
+79: n = n.left;
+80: }
+81:
+82: return n.key;
+83: }
+84:
+85: public void inorderPrint() {
+86: inorder(root);
+87: System.out.println();
+88: }
+89:
+90: private void inorder(BSTNode n) {
+91: if (n != null) {
+92: inorder(n.left);
+93: System.out.print(n.key + " ");
+94: inorder(n.right);
+95: }
+96: }
+97: }
+The above content shows the entire, complete file contents of the requested file.
+
+
+---
+
+### Antigravity Agent (9/25/2026, 9:20:44 AM)
+
+The errors occurred because of three syntax and logic issues in [BST.java](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java):
+
+---
+
+### Root Cause Analysis
+
+1. **`The constructor BSTNode() is undefined` ([BST.java:10](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L10))**
+ - [`BSTNode`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java#L9) defines [`BSTNode(int key)`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java#L14), so Java does not generate a default no-argument constructor.
+ - An empty Binary Search Tree begins with `root = null` (not an instantiated node). Declaring `BSTNode root = new BSTNode();` would also create a node with key `0` and break insertions.
+
+2. **`The method BSTNode(BSTNode) is undefined for the type BST` ([BST.java:27](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L27) & [BST.java:73](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L73))**
+ - Writing `return BSTNode(n);` is treated by the Java compiler as calling an instance method named `BSTNode(...)` on [`BST`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L9).
+ - In both [`insertRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L16) and [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50), you should return the current node pointer: `return n;`.
+
+3. **Base case in [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50)**
+ - In [`deleteRec`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java#L50), `if (n == null) return new BSTNode(k);` would insert a new node when deleting a non-existent key. It was changed to `return null;`.
+
+---
+
+### Changes Applied to [BST.java](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java)
+
+```diff
+ class BST {
+- BSTNode root = new BSTNode();
++ BSTNode root;
+
+ public void insert(int key) {
+ root = insertRec(root, key);
+ }
+
+ private BSTNode insertRec(BSTNode n, int k) {
+ if (n == null) {
+ return new BSTNode(k);
+ };
+
+ if (k < n.key) {
+ n.left = insertRec(n.left, k);
+ } else if (k > n.key) {
+ n.right = insertRec(n.right, k);
+ };
+
+- return BSTNode(n);
++ return n;
+ }
+
+ public boolean search(BSTNode n, int k) {
+...
+ private BSTNode deleteRec(BSTNode n, int k) {
+ if (n == null) {
+- return new BSTNode(k);
++ return null;
+ };
+
+ if (k < n.key) {
+ n.left = deleteRec(n.left, k);
+ } else if (k > n.key) {
+ n.right = deleteRec(n.right, k);
+ } else {
+...
+ };
+
+- return BSTNode(n);
++ return n;
+ }
+```
+
+### Verification
+
+Running [`BSTMain`](file:///home/ajhalili2006/git/ajhalili2006/labs/studentops-codelab/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java#L9) now compiles and produces the expected sorted in-order traversal:
+
+```text
+20 30 40 50 60 70 80
+```
+
+---
+
diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
new file mode 100644
index 0000000..08eadef
--- /dev/null
+++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
@@ -0,0 +1,102 @@
+package dev.andreijiroh.studentops.projects.dsaLabs;
+
+/**
+ * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+ *
+ * AI use disclosure: Gemini Flash (High) via Google Antigravity CLI was used for debugging
+ * the undefined BSTNode() constructor error at L13 by simply declaring the root variable without
+ * doing new BSTNode() part (which also creates a fresh node with key 0 and breaking future insertions).
+ * See archive/genai-toolkit/agy-chat-export-202609251720.md in the repo root for details.
+ *
+ * @author Andrei Jiroh Halili (STI College Meycauayan)
+ * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+ */
+class BST {
+ BSTNode root;
+
+ public void insert(int key) {
+ root = insertRec(root, key);
+ }
+
+ private BSTNode insertRec(BSTNode n, int k) {
+ if (n == null) {
+ return new BSTNode(k);
+ };
+
+ if (k < n.key) {
+ n.left = insertRec(n.left, k);
+ } else if (k > n.key) {
+ n.right = insertRec(n.right, k);
+ };
+
+ return n;
+ }
+
+ public boolean search(BSTNode n, int k) {
+ if (n == null) {
+ return false;
+ }
+
+ if (n.key == k) {
+ return true;
+ }
+
+ if (k < n.key) {
+ return search(n.left, k);
+ } else {
+ return search(n.right, k);
+ }
+ }
+
+ public void deleteKey(int key) {
+ root = deleteRec(root, key);
+ }
+
+ private BSTNode deleteRec(BSTNode n, int k) {
+ if (n == null) {
+ return null;
+ };
+
+ if (k < n.key) {
+ n.left = deleteRec(n.left, k);
+ } else if (k > n.key) {
+ n.right = deleteRec(n.right, k);
+ } else {
+ if (n.left == null) {
+ return n.right;
+ }
+
+ if (n.right == null) {
+ return n.left;
+ }
+
+ n.key = minValue(n.right);
+
+ n.right = deleteRec(n.right, n.key);
+ };
+
+ return n;
+ }
+
+
+ private int minValue(BSTNode n) {
+ while (n.left != null) {
+ n = n.left;
+ }
+
+ return n.key;
+ }
+
+ public void inorderPrint() {
+ inorder(root);
+ System.out.println();
+ }
+
+ private void inorder(BSTNode n) {
+ if (n != null) {
+ inorder(n.left);
+ System.out.print(n.key + " ");
+ inorder(n.right);
+ }
+ }
+}
\ No newline at end of file
diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
new file mode 100644
index 0000000..c4819f9
--- /dev/null
+++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTMain.java
@@ -0,0 +1,43 @@
+package dev.andreijiroh.studentops.projects.dsaLabs;
+
+/**
+ * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+ *
+ * @author Andrei Jiroh Halili (STI College Meycauayan)
+ * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BST.java
+ */
+public class BSTMain {
+ public static void main(String[] args) {
+ BST t = new BST();
+ int[] vals = {50,30,70,20,40,60,80};
+
+ for (int v : vals) {
+ t.insert(v);
+ }
+ t.inorderPrint();
+
+ if (t.search(t.root, 40)) {
+ System.out.println("Search 40: Found");
+ } else {
+ System.out.println("Search 40: Not Found");
+ }
+
+ if (t.search(t.root, 100)) {
+ System.out.println("Search 100: Found");
+ } else {
+ System.out.println("Search 100: Not Found");
+ }
+
+ t.deleteKey(20);
+ System.out.print("After deleting 20: ");
+ t.inorderPrint();
+
+ t.deleteKey(30);
+ System.out.print("After deleting 30: ");
+ t.inorderPrint();
+
+ t.deleteKey(50);
+ System.out.print("After deleting 50: ");
+ t.inorderPrint();
+ }
+}
diff --git a/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
new file mode 100644
index 0000000..e1e3957
--- /dev/null
+++ b/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
@@ -0,0 +1,19 @@
+package dev.andreijiroh.studentops.projects.dsaLabs;
+
+/**
+ * 03 Laboratory Exercise 2 - Data Strucutres and Algorithms
+ *
+ * @author Andrei Jiroh Halili (STI College Meycauayan)
+ * @see https://gitlab.com/andreijiroh-dev/labs/studentops-codelab/-/blob/main/java/src/dev/andreijiroh/studentops/projects/dsaLabs/BSTNode.java
+ */
+class BSTNode {
+ int key;
+ BSTNode left;
+ BSTNode right;
+
+ BSTNode(int key) {
+ this.key = key;
+ left = null;
+ right = null;
+ }
+}