Mechanical install-command + hint-string sweep (packaging split stage 4). Retire the `solstone[journal]` extras spelling and the `--with-executables-from solstone-journal-host` / `--include-deps` exposure flags in favor of the leaf distributions: `solstone-journal`, `solstone-journal-cuda`, and the thin `solstone` client. - INSTALL.md, README.md, CONTRIBUTING.md: install/upgrade/uninstall trios retokenized to the canonical set; exposure passages reshaped to the pip-native-vs-two-tools story; false "journal is becoming its own package" notes dropped; INSTALL.md gains a pre-split migration subsection. - docs/DOCTOR.md, docs/SOLCLI.md: host-deps guidance + distribution facts aligned to the new HOST_DEPENDENCY_REINSTALL_GUIDANCE. - docs/environment.md, docs/FIELD_JOURNAL.md: packaged install refs canonicalized. - solstone/think/doctor.py: HOST_DEPENDENCY_REINSTALL_GUIDANCE updated. - solstone/observe/model_assets.py + tests/test_model_assets.py: missing-models hint -> `pip install solstone-journal`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>