docs(plan): add plan.md for qwen_llama_grok_followup_20260611
The follow-up track had a spec but no plan. The plan is the executable artifact — it specifies file:line refs, exact code to type, TDD steps, and per-file atomic commits. Without the plan, the next agent cannot implement from the spec alone. Plan structure (5 phases, ~40 tasks): - Phase 1: Tool loop lift (5 Red tests + helper + apply to 8 vendors + audit script) - Phase 2: PROVIDERS move (decide location + move + update 4 import sites + audit script) - Phase 3: UX adaptations 2-9 (8 separate applications of the pattern established in parent Phase 5) - Phase 4: Local-first + matrix v2 (12 new fields + native Ollama adapter + Meta Llama API + Local Model GUI badge) - Phase 5: Anthropic / Gemini / DeepSeek migration (matrix entries for the 3 remaining providers + docs update) Each task has: - WHERE: exact file and (where applicable) line range - WHAT: the specific change - HOW: TDD step ordering (Red then Green) - SAFETY: thread-safety, dependency-ordering, and project-invariant constraints The plan models the parent track's plan structure (2177 lines, 2-5 minute steps, per-file atomic commits).
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