Rebased onto next post-#1278. README + skills/mosaic-forge/SKILL.md document the FORGE_NO_EXECUTOR fail-closed rule + --simulate (fast-follow to RI-2-001, now merged). TASKS.md rows updated to measured state: RI-0-001/RI-1-001/RI-1-002/RI-2-001 done (merged with reviews+CI evidence); RI-2-002/RI-3-001/RI-4-001/RI-5-001 in-progress (PRs open, approved, merge-queued); RI-3-002/RI-V-001 not-started.
Squash-merged by topher (jarvis principal) via break-glass: pr-merge.sh hard-codes main-only merge targets and cannot express this repo's next trunk. Gates: CI 2475 green at head 758659dd, review 176 APPROVED (fred) at pinned head.
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