feat: validate bmods with the shared BMAD-METHOD Action and drop the forked stamper

[bmadcode]

CIS stops carrying its own copy of the bmod checks and uses the shared ones from BMAD-METHOD (bmad-code-org/BMAD-METHOD#2996).

Changes

• The bmod CI job runs BMAD-METHOD's composite Action, pinned to a commit SHA. It replaces the full clone of BMAD-METHOD@dev and the local stamper check.
• Deletes the forked tools/stamp_release.py. Its generic rules and --check mode are now in the shared stamper and validator.
• npm test drops test:bmod. The CI job is the gate.
• tools/release.md stamps with the shared stamper from a temporary BMAD-METHOD clone at the pinned SHA, so the release and CI apply the same checks.

Before merge

The pin points at the #2996 branch commit. Once #2996 merges, move the pin to the merge commit on BMAD-METHOD dev. After 6.13.0 is tagged, pin to a release commit.

Testing

• npm test passes.
• The shared validator passes against this tree: 10 skills, 1 module record.

🤖 Generated with Claude Code

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