feat(results): simplify project + results config to one flat symmetric schema

[christso]

Summary

Replaces the dual flat/nested project + results config with one flat symmetric schema shared by the project source repo and the results block. Hard cut — no back-compat (per maintainer decision).

projects:
  - id: agentv
    name: AgentV
    repo: https://github.com/EntityProcess/agentv.git   # slug or URL, optional
    path: /home/entity/projects/EntityProcess/agentv     # local checkout
    branch: main
    results:
      repo: https://github.com/EntityProcess/agentv.git  # optional; defaults to source repo
      path: .                                            # existing checkout OR clone dest
      branch: agentv/results/v1
      auto_push: true

Removed wire fields (now fail validation)

results.remote, repo_url, repo_path, nested repo: / results.repo: objects, ref/source, results.sync.* (use flat auto_push), branch_prefix, push_conflict_policy, require_push.

The internal NormalizedResultsConfig still derives repo_url/repo_path and a remote='origin' alias — only the YAML wire surface is simplified. --results-require-push remains a per-run CLI override.

Rationale

• results is nearly always a repo, so a flat shape is sufficient — nesting added no value.
• Drops the misleading remote field (name-vs-URL ambiguity). Like beads, the git remote name is repo-owned state; AgentV assumes origin and never runs git remote add/set-url.
• Symmetric source/results shape is easier for humans and agents to author.

Changes

• packages/core — ProjectResultsConfig, ResultsConfig wire type, parseResultsConfig, fromYaml/toYaml, normalizeResultsConfig, validation.
• apps/cli results/run-eval mapping; apps/dashboard types/status.
• Docs (dashboard.mdx, results.mdx, running-evals.mdx) incl. a migration section.
• Tests updated for the new shape.

Verification

• bun run build ✅ bun run lint ✅
• Core schema tests (projects, config-loader, results-repo, config-validator): 180 pass
• CLI/dashboard touched tests: 27 pass
• Migrated real ~/.agentv/config.yaml; new build loads all 9 projects correctly.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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