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gsxdsm 283adce4d0 FN-6295: move AI merge clean rooms into worktrees

Move AI-merge clean-room worktrees into the configured worktrees directory while preserving legacy cleanup.

- Resolve AI-merge roots through the configured worktrees directory using a hidden .ai-merge container.
- Keep local git excludes and stale cleanup compatible with legacy .fusion/ai-merge and tmpdir locations.
- Exclude the .ai-merge container from worktree pool and self-healing one-level sweeps.
- Add regression coverage for path resolution, cleanup, orphan reap, and cap enforcement behavior.
- Update architecture and agent guidance for the relocated clean-room root.

Files changed:
 AGENTS.md                                          |  2 +-
 docs/architecture.md                               |  4 +-
 .../engine/src/__tests__/merger-ai-cleanup.test.ts | 50 +++++++++----
 .../__tests__/self-healing-tempdir-sweep.test.ts   | 87 +++++++++++++++++++---
 .../engine/src/__tests__/worktree-paths.test.ts    | 24 ++++++
 .../engine/src/__tests__/worktree-pool.test.ts     | 55 ++++++++++++++
 packages/engine/src/merger-ai.ts                   | 27 +++++--
 packages/engine/src/self-healing.ts                | 25 +++----
 packages/engine/src/worktree-paths.ts              | 17 +++++
 packages/engine/src/worktree-pool.ts               | 10 +--
 10 files changed, 247 insertions(+), 54 deletions(-)

Fusion-Task-Id: FN-6295
Fusion-Task-Lineage: d95d32c2-3253-4964-b68a-252b4cb65109

2026-06-12 12:49:34 -07:00