fix(rivet): resolve 3 duplicate-artifact-id collisions — validate FAIL→PASS

[avrabe]

What

rivet validate was FAIL (3 errors) on duplicate artifact IDs — silent overwrites in the trace graph. All three are genuine ID-namespace collisions:

dup ID	collision	fix
C-1 / C-2	safety-context (safety_case.yaml) vs controller (stpa_controllers_ucas.yaml)	controllers own C-1/C-2 (heavily referenced by UCA target: links) → renamed the safety-contexts to CTX-1/CTX-2 (CTX- was free; SC- is taken by system-constraints)
FV-US-003	two different sw-verifications in verification.yaml (Clippy-lint vs k_object-delegation)	the delegation verification renumbered to the free FV-US-002 (+ its prose ref)

Result

• rivet validate: FAIL (3 errors, 28 warnings) → PASS (30 warnings), 0 broken cross-refs.
• No safety-relevant content changed — only the three colliding IDs (which were silently shadowing each other). The STPA controllers, system-constraints, and the first FV-US-003 keep their IDs; nothing referenced the renamed safety-contexts via links (verified — only a prose mention that was already about the controllers).

The remaining 30 warnings are lifecycle-coverage gaps (311 missing unit/integration/system verification links) — a separate traceability-audit task, not addressed here. The variants/bindings.yaml 'missing field name' warning is a pre-existing rivet variant-config schema mismatch (non-blocking).

🤖 Generated with Claude Code

[codecov]

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