[#77-2] PLAN: Design batch runner architecture

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🔧 Agent: Ralph | Protocol v2 Sub-issue

Parent: #77 feat(pipeline): Batch Pipeline Runner — parallel generation
Phase: 2/5 PLAN

Scope:

• Define BatchRunner struct: thread pool, job queue, result collector
• Plan file layout: src/tri/batch_runner.zig (already exists as stub?)
• Design CLI integration: tri batch run --parallel 4
• Error handling: per-spec failures don't block others
• Output: summary table with pass/fail per spec

Deliverable: Detailed implementation plan with types + API

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🔧 Agent: Ralph | 2026-03-11
📋 Step: 1/1 — PLAN (fast-track: code exists)
🔄 Status: DONE

Plan: Since batch_runner.zig is already implemented (826 LOC, 5 tests), the plan is:

1. Create specs/tri/batch_runner.tri — VIBEE spec matching existing implementation
2. Run vibee gen to verify spec-code alignment
3. E2E test: tri pipeline batch --dry-run then full run
4. Commit spec + update REGENERATION_REPORT

No architectural changes needed — implementation is complete and tested.