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gsxdsm 2085610e9e FN-6246: move AI merge clean rooms into repo storage

Move AI merge clean-room worktrees into a repo-local ignored root while preserving legacy temp cleanup.

- Add repo-local `.fusion/ai-merge` resolution and ignore handling for AI merge worktrees.
- Sweep both repo-local clean rooms and legacy tempdir worktrees with active-session and age safeguards.
- Prune stale git worktree metadata after cleanup and classify missing clean-room errors as transient.
- Update cleanup tests, architecture docs, and changeset coverage for the relocation.

Files changed:
 .changeset/fn-6246-ai-merge-cleanroom-relocation.md       |   5 +
 AGENTS.md                                          |   2 +-
 docs/architecture.md                               |   6 +-
 .../merger-ai-cleanup-active-session.test.ts       |  22 ++-
 .../engine/src/__tests__/merger-ai-cleanup.test.ts |  48 +++++-
 .../ai-merge-worktree-cleanup.test.ts              |  26 ++-
 .../__tests__/self-healing-tempdir-sweep.test.ts   |  34 ++++
 .../transient-merge-error-classifier.test.ts       |   2 +
 packages/engine/src/merger-ai.ts                   | 144 ++++++++++-------
 packages/engine/src/self-healing.ts                | 180 ++++++++++++---------
 .../engine/src/transient-merge-error-classifier.ts |  14 +-
 11 files changed, 325 insertions(+), 158 deletions(-)

Fusion-Task-Id: FN-6246
Fusion-Task-Lineage: f6fe8ef2-aa7b-4cc3-903f-b7a5cc165487

2026-06-12 06:49:29 -07:00