fix(results): ignore unrelated files during remote sync

[christso]

Summary

Remote results sync now stays scoped to AgentV result artifacts. If the results repo has unrelated local files such as package.json or package-lock.json, the dashboard sync path no longer treats them as metadata errors; it pulls remote updates when possible, stages only .agentv/results/**, and pushes only commits whose changed paths are still result artifacts.

This preserves the safety guard against pushing non-result files while allowing normal run/result sync to continue after accidental local junk appears in the results repo.

Verification

• Red-path evidence from dogfood: POST /api/projects/financial-research-agent/remote/sync returned block_reason: "Results repo has non-results working tree changes" with dirty_paths: ["package-lock.json", "package.json"]; dashboard screenshot saved at /tmp/agentv-sync-error.png.
• bunx biome check packages/core/src/evaluation/results-repo.ts packages/core/test/evaluation/results-repo.test.ts
• bun test packages/core/test/evaluation/results-repo.test.ts — 16 pass
• bun --filter @agentv/core typecheck
• Pre-push hook also ran workspace typecheck and biome check . successfully.

Post-Deploy Monitoring & Validation

• Watch dashboard/API logs for /api/projects/:projectId/remote/sync responses containing block_reason, last_error, or sync_status: "dirty".
• Healthy signal: projects with unrelated untracked files in the results repo still return clean/synced status after safe result artifacts are pulled/pushed.
• Failure signal: sync is blocked solely by non-result untracked files, or remote repos receive commits containing paths outside .agentv/results/**.
• Validation window: first dogfood sync after deploy; owner: AgentV maintainer running the remote-sync dogfood bead.

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