DP-56 Add discovery update and force write semantics

[StiensWout]

Summary

• Adds discover code write protection for existing .dp.yaml outputs.
• Adds explicit --force replacement and --update ID-preserving source refresh modes.
• Moves generated discovery source/update reconciliation into core and adds CLI planning coverage plus smoke coverage.

Validation

• npm test
• npm run audit:fallow
• npm run audit:fallow:changed
• npm run check:release-version
• npm run check:package-readiness
• npm run check:package-size-budgets
• git diff --check

Linear: DP-56

[linear-code]

DP-56

[vercel]

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Project	Deployment	Actions	Updated (UTC)
diagram-pilot-website	Ready	Preview, Comment	Jun 16, 2026 8:16am