[TheFabFab]

Rebases the documentor-pg fork (Postgres core, ACP/session patches) from upstream v1.18.34 onto v1.19.3, the latest 1.x release. Upstream now cuts 1.x from its v1 branch; dev is OpenCode 2.

Do not squash-merge. This PR is here to run documentor-ci. It lands by force-pushing this branch to documentor-pg, so the upstream history stays intact. Then tag v1.19.3-documentor-pg.1.

What upstream brings (67 commits)

Configured reasoning options become model variants (anomalyco#55854), xAI receives images in tool results (anomalyco#53549), a Copilot reasoning fix (anomalyco#54207), session sharing is discontinued (anomalyco#55718), a new /update dialog and upgrade --major. The rest is console, docs and stats work.

Rebase

• All 42 fork commits applied with no conflicts. Upstream changed no schema or database files, so no migration needed porting.
• Effect is still 4.0.0-beta.83, so the patch stays as is (_deferredInterrupt present after install).
• The base version in documentor-ci.yml and FORK.md is bumped to 1.19.3.

Local checks (dev container, embedded Postgres 18, run as root)

• bun turbo typecheck: 31/31 pass
• documentor: tests (FORK.md step 7): 52/52 pass
• binary-smoke.sh against a --single build: passes
• bun turbo test: 8 failures, all environmental:
  • 4 are the known root-only cases in FORK.md
  • 2 migrateAll selection cases pass when the file runs alone; another package's throwaway schemas were being dropped during the scan
  • 2 timeouts (collation, 520-message session-messages) pass with a longer timeout on this WSL disk

🤖 Generated with Claude Code

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• PR description is missing required template sections. Please use the PR template.

Please edit this PR description to address the above within 72 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

Hey! Your PR title Rebase documentor-pg onto upstream v1.19.3 (do not squash) doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.