refactor(tutor): decouple tools from Supabase via TutorPersistence

[Peleke]

Summary

• Extract TutorPersistence interface + TutorPersistenceSupabase class (lib/services/tutor-persistence.ts) — all DB queries in clean, injectable methods
• Each of the 7 DB-touching tutor tools now exports a pure core function (accepts TutorPersistence + userId) alongside the existing LangChain tool() shim
• tutor-supabase.ts rewired to use core functions with injected persistence — no more tool.invoke() pass-through, ServiceContext actually used now
• All 8 API routes in app/api/tutor/ migrated from direct tool imports to createServices() service bus

Why

Tools were hardwired to Supabase (createClient() + auth.getUser() in every tool), blocking backend switching (Qortex), making LLM logic untestable without Supabase, and duplicating auth across 8 files. The service bus wrapper was a no-op pass-through.

Test plan

• npm run type-check — zero errors in changed files
• npx vitest run lib/services/__tests__/tutor.integration.test.ts — 16 tests pass (added mock persistence tests)
• Manual E2E: tutor dialog start/continue, roleplay start/continue, analyze, overview, review
• Verify Qortex backend still works (JWT forwarding unchanged)

Closes #256

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[claude]

Code Review: refactor(tutor): decouple tools from Supabase via TutorPersistence

Overall assessment: The architectural direction is sound and the motivation is clear, but the PR as submitted has several issues that need resolution before merging.

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Scope Mismatch

The title and description describe extracting TutorPersistence (the final commit), but the branch contains 25 commits spanning 6+ phases: a full lib/ai/ rewrite, LangGraph migration, processor refactoring, a complete service bus for all API routes, and only finally the TutorPersistence extraction. This makes atomic review difficult and increases risk considerably.

The core files described in the PR summary — lib/services/tutor-persistence.ts, lib/services/tutor-supabase.ts, lib/services/__tests__/tutor.integration.test.ts — don't appear in the 100-file diff because they were introduced in earlier commits in the branch and aren't deltas relative to staging. Reviewers can't verify the central claimed change without checking the branch tree directly.

Recommendation: Consider splitting this into smaller PRs scoped to each phase, or at minimum update the PR description to accurately document the full scope of changes.

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CI Failure

The Quality Checks job is failing. The local test results mentioned in the PR test plan (npm run type-check clean, 16 tests pass) don't reflect CI state. This needs to be green before merging.

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Test Coverage Regression — Odin Subsystem

Two test files have been nearly entirely deleted without explanation:

• hooks/__tests__/useOdinSpeak.test.ts: 856 lines deleted, 5 remaining
• components/odin/__tests__/OdinLiveHead.test.tsx: 708 lines deleted, 5 remaining

That's ~1,564 lines of test coverage for the Odin/audio subsystem removed. The PR description doesn't mention this. Are these being replaced elsewhere? Moved? Deprecated because the component changed? This needs explanation. If the tests are genuinely obsolete (e.g., the components were refactored), that should be documented explicitly. If they're not, restoring coverage is a prerequisite for merging.

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Integration Test Gaps

The commit history notes 77/91 integration tests passing, with 14 failures attributed to schema gaps (dictionary_entries table, preferred_image_provider column). These are described as "pre-existing" but they're failing against code in this PR. Options:

1. Fix the schema gaps in this PR (preferred)
2. Add explicit .skip with a linked tracking issue for each failure
3. Document them as blocked by a specific pending migration PR

Merging with known test failures — even "pre-existing" ones — sets a bad precedent and makes future regressions harder to detect.

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Positive Observations

Good fixes included in this PR:

• Auth hardening in tutor-qortex.ts: Failing fast when session JWT is missing prevents silently sending unauthenticated requests to Qortex. This was a real vulnerability.
• Race condition fix in lessons.ts: Using upsert with ignoreDuplicates for lesson completion prevents TOCTOU double-awarding of XP on concurrent requests. Correct pattern.
• Architectural direction: The TutorPersistence interface + injectable persistence is the right design. Decoupling LLM logic from Supabase auth calls makes the tutor testable without a live DB and enables backend switching (Qortex).
• Service bus consolidation: The route simplifications (e.g., lesson routes going from 127 to 19 lines) show the service bus is doing real work, not just indirecting.
• Test additions: The new lib/ai/__tests__/ suite adds substantial coverage for the model factory, processors, graphs, and prompt rendering.

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Minor Issues

• app/api/v1/content/generate/route.ts is entirely deleted (97 lines). If this endpoint was public or used anywhere, callers need to be notified or redirected. Confirm no external consumers.
• The docs/odin/VIDEO_SCRIPTS.md addition (+84 lines) appears unrelated to the stated refactor — consider whether this belongs in a separate PR or commit.
• components/reader/TextRenderPanel.tsx (+33/-18) is also unrelated to the tutor persistence decoupling.

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Summary

Area	Status
Architectural direction	✅ Correct
PR scope vs. description	❌ Significant mismatch
CI	❌ Quality Checks failing
Odin test deletions	❌ ~1,564 lines unexplained
Integration test failures	⚠️ 14 known failures need resolution/tracking
Security fixes (JWT, race condition)	✅ Good
Base branch (staging)	✅ Correct

Blockers before merge:

1. Fix CI failures
2. Explain and resolve the Odin test deletions (restore or document retirement)
3. Resolve the 14 integration test failures or add tracked skips with linked issues

🤖 Generated with Claude Code