agent-task-management: add stalled-worker recovery procedure

Multiple ior/player tasks had a worker stall or get interrupted mid-edit,
leaving broken, uncommitted partial file edits with no documented recovery
path. Add references/6-recover-stalled-task.md covering detect -> assess ->
revert -> resume: how to spot a partial/interrupted edit (dirty worktree,
broken build, half-applied diffs), assess dirty changes against the task
annotations (keep in-scope WIP vs. discard broken edits vs. preserve unrelated
user changes), revert cleanly with scoped git checkout/stash WITHOUT destroying
unrelated work, then re-read annotations, resume from the last known-good
point, and annotate the recovery.

Wire the new reference into SKILL.md's 'When to load what' table and cross-ref
it from 2-start-task.md when picking up an already-started task. Commit
discipline is cross-referenced to 3-complete-task.md rather than duplicated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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