fix(results): push same-repo results to project origin, not a synthesized URL

[christso]

Problem

For a project whose results live in the same repo (results.repo_path: ., remote: origin), clicking Push results (or auto-push) fails:

git push --porcelain origin refs/heads/agentv/results/v1:...
remote: Not Found
fatal: repository 'https://github.com/..git/' not found

Even after git remote set-url origin <correct>, the push still targets https://github.com/..git — AgentV re-derives and rewrites the remote itself.

Root cause

resolveResultsRepoUrl() synthesized a GitHub URL from any non-URL string:
return \https://github.com/${repo}.git\`` (packages/core/src/evaluation/results-repo.ts). With repo_path: ., normalizeResultsConfig sets repo = '.', so resolveResultsRepoUrl('.') → https://github.com/ + . + .git = https://github.com/..git. That value is then written via ensureResultsRepoRemote() (git remote set-url), clobbering the correct origin.

Fix (packages/core/src/evaluation/results-repo.ts)

• resolveResultsRepoUrl() only expands genuine GitHub owner/repo shorthand (/^[A-Za-z0-9_.-]+\/[A-Za-z0-9_.-]+$/); explicit URLs pass through; local paths (incl. .) are returned unchanged.
• ensureResultsRepoRemote() refuses to rewrite an existing remote to a non-URL value, so same-repo results keep using the project's real origin. Separate-repo (repo_url) behaviour is preserved.

Validation

• bun run --filter @agentv/core typecheck → ✓
• bun test packages/core/test/evaluation/results-repo.test.ts → 56 pass, 0 fail (3 new regression tests)

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