fix: resolve promotion PR 31 review findings

[BeforeLights]

Summary

• resolves all 29 accepted CodeRabbit findings from promotion PR promote: dev history slice 2 of 4 #31 with focused regression coverage
• records the complete 32-finding disposition (29 accepted, 3 rejected with evidence)
• preserves the reviewed historical promotion slice; this repair PR targets dev and must not trigger CodeRabbit

Verification

• corepack pnpm repo:check
• corepack pnpm repo:build
• 30 substantive commits

Review flow

Do not request CodeRabbit on this PR. After this merges to dev, the fixing commits and disposition will be linked on promotion PR #31, which has already received its one allowed CodeRabbit review.

[coderabbitai]

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