feat(dev-loop): full 10-step autonomous cycle with experience/ source of truth

[gHashTag]

Summary

Implements Issue #420 — the full autonomous agent cycle (10 steps) with experience/ as source of truth and immutable GitHub Issue records.

Changes by file:

• dev_scan.zig — Step 1: Enriches scan results with experience context from .trinity/experience/episodes/. Counts past pass/fail per issue, loads similar_tasks.json index, adds experience-sourced items. New fields: past_attempts, past_pass, past_fail, has_experience.

• dev_pick.zig — Step 2: Enhanced MNL avoidance reads fail counts enriched by experience. Adds experience boost factor (+5 per past success) for tractable tasks. New test: experience_boost, mnl_skips_3x_failed.

• github_commands.zig — Step 3: Adds --phase N/M flag to tri issue comment for dev loop step-tracking format: "{emoji} [{STATUS}] Step {N}/10 — {detail}". Backward-compatible with legacy Protocol v2 format.

• dev_loop.zig — Steps 1-10: Full integration. Each phase posts immutable step comment to GitHub issue. Saves mistakes on test failure (saveMistakeForIssue). Experience save uses JSONL format. Loop decide reads episode energy.

• tri_experience.zig — Step 8: JSONL append-only episode log at activity.jsonl (ESAA pattern). Updates similar_tasks.json index on each episode save. Deduplicates by issue ID.

• heartbeat.zig — Step 10: tri loop decide reads all episodes, calculates energy (pass/total ratio), considers recent failure rate. Thresholds: >50% = CONTINUE, 30-50% = IDLE, <30% = STOP. Saves decision to .trinity/state/loop_state.json.

Architecture (Golden Chain)

tri dev scan          → reads issues + .trinity/experience/similar_tasks.json
tri dev pick --smart  → priority + avoids 3x failed tasks (MNL pattern)
tri issue comment N   → 🔍 [RESEARCH] Step 3/10
tri spec create       → reuse closest template from experience/
tri gen               → .tri → .zig + tri issue comment "⚙️ [CODEGEN]"
tri test              → IF FAIL → save to .trinity/mistakes/
tri verdict --toxic   → compare with past verdicts
tri experience save   → saves JSONL episode + updates similar_tasks.json
tri git commit        → tri issue comment "✅ [DONE]"
tri loop decide       → energy-based continue/stop

Acceptance Criteria

• tri dev scan returns list with experience context
• MNL pattern correctly skips 3x failed tasks
• Each step writes immutable comment to GitHub issue
• tri experience save creates JSONL episode
• tri loop decide reads past episodes and makes decision
• Tests added for all new functionality

Test plan

• zig build compiles without errors
• zig build test — all new tests pass (Episode JSONL fields, experience context, MNL penalty, extractEpisodeVerdict, energy calculation)
• tri dev scan shows experience context in output
• tri dev pick --smart deprioritizes 3+ failure items
• tri issue comment N --phase "3/10" --status RESEARCH --step "agent started" produces step-tracking format
• tri experience save --task "test" --verdict PASS creates episode JSON + appends to activity.jsonl
• tri loop decide shows energy percentage and decision

Closes #420

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