chore(claude-md): add step 14 hypothesis check for CI/external-deps fixes

[nayrosk]

Summary

• Add Step 14 (HYPOTHESIS CHECK) to CLAUDE.md workflow: mandate explicit declaration of assumptions, pre/post-merge validation, and rollback contingency for CI/workflow changes depending on undocumented third-party service behavior.
• Renumber subsequent steps 14-20 → 15-21; update internal references.
• Governance requirement flagged by @it-consultant retrocontrol (issue ci(release): restore default GHCR install hint to real image tags #74, PR fix(ci): promote all image tags after attestation for GHCR UI #75).

Type of change

• docs

Changes

• CLAUDE.md: Added Step 14 HYPOTHESIS CHECK; renumbered Steps 15-21; updated Step 20 RETRO to audit Step 14 clauses.

Testing

• N/A — documentation-only change; no code, tests, or linter impact.

Breaking changes

None — adds new required declaration in PR bodies for CI/workflow changes; existing changes already merged are grandfathered under retrocontrol audit (issue #74).

Related

• Roadmap: N/A — governance change
• Closes docs(claude-md): add step 14 hypothesis check for CI/external-deps fixes #76

[coderabbitai]

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