fix(results): keep dashboard status read-only for repo paths

[christso]

Summary

• Prevent getResultsRepoSyncStatus() from fetching configured storage branches for repo_path/same-checkout results configs.
• Add a regression proving status inspection leaves both the existing origin URL and missing refs/remotes/origin/agentv/results/v1 untouched.

Root cause / investigation

• Current Dashboard startup, /api/config, /api/remote/status, and /api/projects/:id/remote/status did not rewrite a disposable repo origin to https://github.com/..git.
• The historical https://github.com/..git corruption path was PR fix(results): push same-repo results to project origin, not a synthesized URL #1502-era results sync code: resolveResultsRepoUrl('.') synthesized the placeholder URL and ensureResultsRepoRemote() ran git remote set-url. That path is already removed on current main.
• A remaining Dashboard read path was still not read-only: remote status for results.repo.path: . fetched the storage branch into the source checkout on page-load status polling. This did not rewrite origin, but it did mutate source checkout Git refs from a read-only Dashboard status request.

Red / green evidence

• Red regression before fix: bun test ./packages/core/test/evaluation/results-repo.test.ts --test-name-pattern "does not fetch a repo_path storage branch during status inspection" failed because refs/remotes/origin/agentv/results/v1 became present.
• Green after fix: the same regression passes.
• Disposable Dashboard UAT after rebuild:
  • Before startup: origin URL correct, remote results ref absent.
  • After startup and GET /api/remote/status: origin URL unchanged, remote results ref still absent, run_count 0.
  • After explicit POST /api/remote/sync: origin URL unchanged, remote results ref present, run_count 1.

Verification

• bun test ./packages/core/test/evaluation/results-repo.test.ts --test-name-pattern "does not fetch a repo_path storage branch during status inspection"
• bun test ./packages/core/test/evaluation/results-repo.test.ts
• bun test ./apps/cli/test/commands/results/serve.test.ts --test-name-pattern "remote/status|remote/sync|project-scoped remote status"
• bun --filter @agentv/core typecheck
• bun --filter @agentv/core lint
• bun run build
• Verified git remote -v in both worker and primary checkout remained https://github.com/EntityProcess/agentv.git for fetch/push.

Bead: av-0p9

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