diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..e1946ec
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,8 @@
+{
+  "[json]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true },
+  "[jsonc]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true },
+  "[typescript]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true },
+  "[typescriptreact]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true },
+  "[javascript]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true },
+  "[javascriptreact]": { "editor.defaultFormatter": "dprint.dprint", "editor.formatOnSave": true }
+}
diff --git a/docs/data-model-mapping.md b/docs/data-model-mapping.md
new file mode 100644
index 0000000..b794a92
--- /dev/null
+++ b/docs/data-model-mapping.md
@@ -0,0 +1,34 @@
+# Data Model Mapping
+
+This document maps the public AT Protocol Lexicon records to our internal SQL database schema.
+
+## Principles
+
+1. **Separation of Concerns**
+   We store "my view" of the world (private state) separate from "the network's view" (public records).
+2. **Hydration**
+   We allow hydrating public records into local DB rows for efficient query/indexing, but the source of truth for the record itself is the signed commit in the repository.
+3. **Private State**
+   User progress, scheduling, and local-only drafts live ONLY in the internal DB.
+
+## Mapping Table
+
+| Public Lexicon                 | Internal DB Table(s) | Notes                                                          |
+| :----------------------------- | :------------------- | :------------------------------------------------------------- |
+| `app.malfestio.deck`           | `decks`              | Public metadata.                                               |
+| `app.malfestio.card`           | `cards`              | Content.                                                       |
+| `app.malfestio.note`           | `notes`              | Standalone notes.                                              |
+| `app.malfestio.source.*`       | `sources`            | Metadata for articles/lectures.                                |
+| `app.malfestio.collection`     | `collections`        |                                                                |
+| `app.malfestio.thread.comment` | `comments`           |                                                                |
+| _(None)_                       | `reviews`            | **Private**. Logs of every review event.                       |
+| _(None)_                       | `study_progress`     | **Private**. Current SRS state for a card (box/interval/ease). |
+| _(None)_                       | `user_settings`      | **Private**. Daily goals, UI references.                       |
+| _(None)_                       | `drafts`             | **Private**. Content being authored before publishing.         |
+
+## Sync Strategy
+
+- **Publishing**:
+  Write to `drafts` -> User clicks "Publish" -> Sign record -> Push to PDS -> Move `drafts` content to `decks`/`cards` tables (or mark as synced).
+- **Consuming**:
+  Pull from PDS (firehose or direct sync) -> Validate signature -> Upsert into local tables.
diff --git a/docs/publish-pipeline.md b/docs/publish-pipeline.md
new file mode 100644
index 0000000..768366f
--- /dev/null
+++ b/docs/publish-pipeline.md
@@ -0,0 +1,38 @@
+# Publish Pipeline Spec
+
+This document defines the lifecycle of content from draft to published record.
+
+## Lifecycle States
+
+1. **Draft** (Local Only)
+    - Stored in local SQL/captured in UI state.
+    - Not visible to PDS or other users.
+    - Mutable without restriction.
+    - IDs are local UUIDs or temporary placeholders.
+
+2. **Published** (Public / Unlisted / Shared)
+    - Signed and committed to the AT Protocol repository.
+    - Assigned a permanent `at://` URI.
+    - stored in Lexicon-compliant format.
+    - **Edits**: Append a new commit replacing the record. History is technically preserved in the repo log but UI typically shows latest.
+
+3. **Deprecated / Tombstoned**
+    - User "deletes" the content.
+    - **Action**: We replace the record with a minimal "tombstone" or actually delete the record from the repo (RepoOp `delete`).
+    - *Note*: Aggregators may still have cached copies.
+
+## Protocol Flow
+
+1. **Auth**: User logs in via OAuth (or app app-password initially).
+2. **Format**: App converts internal `Draft` model -> `Lexicon` JSON.
+3. **Sign & Commit**:
+    - App constructs a repository operation (create/update).
+    - Sends to PDS (Personal Data Server).
+4. **Confirm**: PDS confirms commit CID.
+5. **Index**: App updates local distinct "published" view to match confirmed state.
+
+## Versioning Content
+
+- No git-like branching for content *history* in the MVP.
+- "Edit" = "Overwrite".
+- Collaborative editing (forking) = "Copy & Publish New".
diff --git a/docs/todo.md b/docs/todo.md
index c60ff9f..c90b919 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -37,39 +37,9 @@
 
 ## Roadmap Milestones
 
-### Milestone A - Product Spec + IA + UX Flows
+- **(Done) Milestone A**: Defined core user journeys, information architecture, and privacy rules for the platform.
 
-#### Deliverables
-
-- Core user journeys (5):
-    - Import source -> generate notes/cards -> publish deck
-    - Daily study -> review queue -> grade -> progress view
-    - Follow curator -> discover deck -> fork -> contribute improvements
-    - Discuss a card/deck -> moderation/report flow
-    - Lecture workflow -> outline -> timestamps -> linked cards
-- Information architecture + navigation map
-- "Share vs private" rules doc (what becomes public records; what never does)
-
-#### Acceptance
-
-- Every screen maps to a backend capability + a data model entity.
-
-### Milestone B - Lexicon Design Kit + Data Model Mapping
-
-#### Deliverables
-
-- Lexicon repo folder with:
-    - record schemas for note/card/deck/article/lecture/collection/comment
-    - schema evolution notes (what can change, what cannot)
-- Mapping doc:
-    - Public record (lexicon) <-> internal DB row(s)
-- Minimal "publish pipeline" spec (draft->published->deprecated)
-
-#### Acceptance
-
-- You can create a deck and serialize it into a stable record shape.
-- Follow Lexicon rules; prefer additive evolution.
-- Review Bluesky "custom schemas" patterns for compatibility expectations.
+- **(Done) Milestone B**: Designed AT Protocol Lexicons for all core types and documented data model mapping + publishing pipeline.
 
 ### Milestone C - Foundations: Repo, CI, Axum API Skeleton, Solid Shell
 
diff --git a/dprint.json b/dprint.json
new file mode 100644
index 0000000..764a77d
--- /dev/null
+++ b/dprint.json
@@ -0,0 +1,6 @@
+{
+  "typescript": { "preferSingleLine": true, "jsx.bracketPosition": "sameLine" },
+  "json": { "preferSingleLine": true, "lineWidth": 121, "indentWidth": 2 },
+  "excludes": ["**/node_modules"],
+  "plugins": ["https://plugins.dprint.dev/typescript-0.95.8.wasm", "https://plugins.dprint.dev/json-0.20.0.wasm"]
+}
diff --git a/lexicons/README.md b/lexicons/README.md
new file mode 100644
index 0000000..317292c
--- /dev/null
+++ b/lexicons/README.md
@@ -0,0 +1,11 @@
+# Lexicon Schemas
+
+This directory contains the Lexicon definitions for the malfestio's public records.
+
+## Evolution Rules
+
+1. **Additive Changes Only**: You can add new optional fields to existing records.
+2. **No Renaming**: Do not rename fields.
+   If a semantic change is needed, add a new field and deprecate the old one.
+3. **No Type Changes**: Once published, a field's type is fixed.
+4. **Version by Copying**: If a breaking change is absolutely required, create a new Lexicon with a new major version or a new name (e.g., `app.malfestio.noteV2`).
diff --git a/lexicons/app/malfestio/card.json b/lexicons/app/malfestio/card.json
new file mode 100644
index 0000000..baa53ce
--- /dev/null
+++ b/lexicons/app/malfestio/card.json
@@ -0,0 +1,59 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.card",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A flashcard for spaced repetition study.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["deckRef", "front", "back", "createdAt"],
+        "properties": {
+          "deckRef": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "Reference to the deck this card belongs to."
+          },
+          "front": {
+            "type": "string",
+            "format": "markdown",
+            "maxLength": 10000,
+            "description": "Content on the front of the card."
+          },
+          "back": {
+            "type": "string",
+            "format": "markdown",
+            "maxLength": 10000,
+            "description": "Content on the back of the card."
+          },
+          "cardType": {
+            "type": "string",
+            "knownValues": ["basic", "cloze"],
+            "default": "basic",
+            "description": "Type of the card (e.g., basic or cloze deletion)."
+          },
+          "hints": {
+            "type": "array",
+            "items": { "type": "string" },
+            "description": "Optional hints to display before revealing the answer."
+          },
+          "media": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "required": ["uri", "kind"],
+              "properties": {
+                "uri": { "type": "string", "format": "uri" },
+                "kind": { "type": "string", "knownValues": ["image", "audio"] },
+                "alt": { "type": "string" }
+              }
+            },
+            "description": "Multimedia attachments for the card."
+          },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/collection.json b/lexicons/app/malfestio/collection.json
new file mode 100644
index 0000000..9cf52a2
--- /dev/null
+++ b/lexicons/app/malfestio/collection.json
@@ -0,0 +1,34 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.collection",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A curated collection or learning path.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["title", "createdAt"],
+        "properties": {
+          "title": { "type": "string", "maxLength": 300 },
+          "description": { "type": "string", "maxLength": 3000 },
+          "items": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "required": ["type", "ref"],
+              "properties": {
+                "type": { "type": "string", "knownValues": ["deck", "note", "article", "lecture"] },
+                "ref": { "type": "string", "format": "at-uri" },
+                "note": { "type": "string", "description": "Curator's note about this item." }
+              }
+            },
+            "description": "Ordered items in the collection."
+          },
+          "tags": { "type": "array", "items": { "type": "string" }, "maxLength": 64 },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/deck.json b/lexicons/app/malfestio/deck.json
new file mode 100644
index 0000000..aeb82d0
--- /dev/null
+++ b/lexicons/app/malfestio/deck.json
@@ -0,0 +1,32 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.deck",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A collection of flashcards and sources.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["title", "createdAt"],
+        "properties": {
+          "title": { "type": "string", "maxLength": 300, "description": "Title of the deck." },
+          "description": { "type": "string", "maxLength": 3000, "description": "Description of the deck context." },
+          "tags": { "type": "array", "items": { "type": "string" }, "maxLength": 64 },
+          "cardRefs": {
+            "type": "array",
+            "items": { "type": "string", "format": "at-uri" },
+            "description": "Ordered list of references to cards in this deck."
+          },
+          "sourceRefs": {
+            "type": "array",
+            "items": { "type": "string", "format": "at-uri" },
+            "description": "References to source materials (articles, lectures) used in this deck."
+          },
+          "license": { "type": "string", "description": "License for the deck content." },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/note.json b/lexicons/app/malfestio/note.json
new file mode 100644
index 0000000..4f61f22
--- /dev/null
+++ b/lexicons/app/malfestio/note.json
@@ -0,0 +1,51 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.note",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A standalone note containing rich text, tags, and links.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["title", "body", "createdAt"],
+        "properties": {
+          "title": { "type": "string", "maxLength": 300, "description": "Title of the note." },
+          "body": {
+            "type": "string",
+            "format": "markdown",
+            "maxLength": 100000,
+            "description": "The body content of the note in Markdown format."
+          },
+          "tags": {
+            "type": "array",
+            "items": { "type": "string" },
+            "maxLength": 64,
+            "description": "Tags associated with the note."
+          },
+          "links": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "required": ["uri"],
+              "properties": {
+                "uri": { "type": "string", "format": "uri" },
+                "title": { "type": "string" },
+                "type": { "type": "string", "description": "Type hint for the linked resource." }
+              }
+            },
+            "description": "External or internal links referenced in the note."
+          },
+          "createdAt": { "type": "string", "format": "datetime", "description": "Timestamp of creation." },
+          "updatedAt": { "type": "string", "format": "datetime", "description": "Timestamp of last update." },
+          "visibility": {
+            "type": "string",
+            "knownValues": ["private", "unlisted", "public"],
+            "default": "private",
+            "description": "Visibility setting for the note."
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/source/article.json b/lexicons/app/malfestio/source/article.json
new file mode 100644
index 0000000..b5c90a5
--- /dev/null
+++ b/lexicons/app/malfestio/source/article.json
@@ -0,0 +1,43 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.source.article",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A reference to an article used as source material.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["url", "title", "createdAt"],
+        "properties": {
+          "url": { "type": "string", "format": "uri", "description": "URL of the article." },
+          "title": { "type": "string", "description": "Title of the article." },
+          "author": { "type": "string", "description": "Author of the article." },
+          "publishedAt": {
+            "type": "string",
+            "format": "datetime",
+            "description": "Original publication date of the article."
+          },
+          "extractedTextRef": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "Optional reference to a blob or record containing the extracted text."
+          },
+          "highlights": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "properties": {
+                "quote": { "type": "string", "maxLength": 5000 },
+                "start": { "type": "integer", "description": "Character start offset." },
+                "end": { "type": "integer", "description": "Character end offset." }
+              }
+            },
+            "description": "User highlights from the article."
+          },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/source/lecture.json b/lexicons/app/malfestio/source/lecture.json
new file mode 100644
index 0000000..aeea89e
--- /dev/null
+++ b/lexicons/app/malfestio/source/lecture.json
@@ -0,0 +1,38 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.source.lecture",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A reference to a lecture or video used as source material.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["url", "title", "createdAt"],
+        "properties": {
+          "url": { "type": "string", "format": "uri", "description": "URL of the lecture (e.g., YouTube link)." },
+          "title": { "type": "string", "description": "Title of the lecture." },
+          "creator": { "type": "string", "description": "Creator or channel name." },
+          "timestamps": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "required": ["t", "label"],
+              "properties": {
+                "t": { "type": "integer", "description": "Time in seconds." },
+                "label": { "type": "string", "description": "Description of the timestamp." },
+                "noteRef": {
+                  "type": "string",
+                  "format": "at-uri",
+                  "description": "Optional reference to a note taken at this timestamp."
+                }
+              }
+            },
+            "description": "Important timestamps or chapters in the lecture."
+          },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/app/malfestio/thread/comment.json b/lexicons/app/malfestio/thread/comment.json
new file mode 100644
index 0000000..acf9fa4
--- /dev/null
+++ b/lexicons/app/malfestio/thread/comment.json
@@ -0,0 +1,21 @@
+{
+  "lexicon": 1,
+  "id": "app.malfestio.thread.comment",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A comment on a deck, card, or note.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["subjectRef", "body", "createdAt"],
+        "properties": {
+          "subjectRef": { "type": "string", "format": "at-uri", "description": "The root subject being commented on." },
+          "replyTo": { "type": "string", "format": "at-uri", "description": "The parent comment if this is a reply." },
+          "body": { "type": "string", "format": "markdown", "maxLength": 5000, "description": "The comment text." },
+          "createdAt": { "type": "string", "format": "datetime" }
+        }
+      }
+    }
+  }
+}