fix: complete work session intelligence port

[Steffen025]

Summary

Fixes #24 — Work sessions were empty shells: no assistant responses, always-empty ISC.json, truncated user messages, no effort classification.

This PR ports the work session intelligence from Daniel Miessler's original PAI system to PAI-OpenCode.

Changes (5 Phases)

Phase 1: Trivial Message Filtering

• Added isTrivialMessage() — regex-based filtering for greetings, acknowledgments, ratings, farewells
• Both session creation paths gated (min 25 chars + pattern matching)
• Commands (/) and code snippets bypass filtering

Phase 2: Assistant Response Capture

• Full assistant responses now appended to THREAD.md as **Assistant:** {content}
• Gated by active session check — no writes without a session

Phase 3: ISC Criteria Bridge

• algorithm-tracker.ts now calls updateISC() from work-tracker.ts when TodoWrite fires
• Criteria automatically separated into criteria and anti_criteria based on ISC-A naming
• ISC.json now tracks total, completed, and updated_at

Phase 4: Effort Level in META

• Detects effort level on session creation using existing detectEffortLevel()
• Writes effort_level: and effort_budget: to session META.yaml
• Example: effort_level: Standard / effort_budget: <2min

Phase 5: Full User Messages

• Removed .substring(0, 200) truncation from both THREAD.md append sites
• User messages now captured in full

Before vs After

Data	Before	After
User messages	Truncated to 200 chars	Full content
Assistant responses	Not captured	Full response in THREAD.md
ISC criteria	Always empty []	Populated from Algorithm's TodoWrite
Effort level	Not recorded	Written to META.yaml
Trivial filtering	No filtering (empty sessions)	Greetings/ratings/farewells skipped

Files Changed

• .opencode/plugins/pai-unified.ts — Phases 1, 2, 4, 5
• .opencode/plugins/handlers/work-tracker.ts — Phase 1 (isTrivialMessage) + Phase 3 (updateISC enhancement)
• .opencode/plugins/handlers/algorithm-tracker.ts — Phase 3 (ISC bridge)

Testing

All changes are non-blocking (try/catch with fileLog). Bun build passes clean for all 3 files. No new dependencies added.

Thanks to @Deezinor for the detailed issue report and phased proposal.