[codex] Add channel output tone and grammar fixer

[crazygo]

Summary

Adds the channel-level output tone and input grammar fixer architecture discussed in the product design thread.

• Adds channel output tone storage with Direct, Socratic, Rhetorical, and Custom settings.
• Injects the current channel output tone into the default/local model system prompt.
• Adds channel grammar fixer enable/disable state and display-only grammar check metadata.
• Adds system tools so the model can update output tone, custom output tone, and grammar fixer settings.
• Updates the mobile channel settings UI, user-bubble grammar indicators, tests, docs, backlog, migration, and code maps.

Product Notes

Output tone is channel state, not a per-response model invocation. Grammar fixer does not rewrite the main user input; it only updates user-message metadata with accepted/suggested UI feedback.

Reply action buttons are intentionally out of this PR and captured in backlog.

Validation

• cd apps/node_backend && npm run type-check
• cd apps/node_backend && npm test -- src/services/chatRouterService.test.ts src/services/localAgentLoopService.test.ts src/routes/chat.test.ts
• cd apps/mobile_chat_app && flutter analyze
• cd apps/mobile_chat_app && flutter test
• Code maps parsed with local apps/node_backend/node_modules/js-yaml

Full backend npm test still requires database env and currently stops at src/app.test.ts when no DATABASE_URL / Postgres URL is configured.

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Project	Deployment	Actions	Updated (UTC)
bricks	Ready	Preview, Comment	Jun 17, 2026 9:50am