fix(ci): guard eval schema generation

[christso]

Summary

Eval schema drift is now a focused CI failure instead of a late surprise in the broad test job. bun run validate:eval-schema regenerates skills-data/agentv-eval-writer/references/eval.schema.json from the Zod source, fails when that run changes the artifact, and tells workers to commit the generated diff instead of editing JSON by hand.

The root package also has a direct regeneration alias, and the repo verification guidance plus schema source comments now point eval-schema authors at the root guard command.

Validation

• bun install --frozen-lockfile
• bun run validate:eval-schema
• bun test packages/core/test/evaluation/validation/eval-schema-sync.test.ts
• bun x biome check scripts/check-eval-schema.ts package.json .github/workflows/ci.yml .agents/verification.md packages/core/src/evaluation/validation/eval-file.schema.ts packages/core/scripts/generate-eval-schema.ts
• bun run generate:eval-schema
• git diff --check
• Manual review fallback found no actionable issues. The full ce-code-review subagent flow was not run because this tool surface only permits subagents when the user explicitly asks for delegation.

Post-Deploy Monitoring & Validation

No additional operational monitoring required: this change only affects CI and local developer commands.

Healthy signal: PR CI reaches the Check generated eval schema sync step and passes before the broader test suite. Failure signal: that step emits the schema drift error and diff. Mitigation: run bun run validate:eval-schema, review the generated schema diff, and commit it with the Zod schema change. Validation window and owner: the next PR that touches packages/core/src/evaluation/validation/eval-file.schema.ts, owned by that PR's author and reviewer.

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