docs: evaluate optional visual cockpit (emdash) over headless pipeline

[robercano-ghbot]

Summary

Adds docs/COCKPIT_EVALUATION.md, a decision note evaluating emdash (YC W26, Apache-2.0) — a desktop GUI for running multiple coding agents in parallel git worktrees — against this harness.

Covers:

1. Integration seam — both tools drive git worktrees directly; the rule is one driver per session (either emdash or the harness, never both concurrently against the same repo).
2. CI-check surfacing — depends on server-side gates (a GitHub Actions workflow publishing checks via the Checks API), not on the GUI itself. This harness's gates currently run locally and don't post GitHub checks; that's the scope of the separate CI-workflow effort (issue Run the self-adapter gates in CI on PRs to this repo #25).
3. What the harness keeps that no GUI replaces — gates-as-code, defined roles (orchestrator/implementer/reviewer/test-runner), adversarial multi-lens review, and headless autonomy (cron poll + scheduled wakeups, no human/GUI required).
4. Recommendation — emdash as an optional cockpit (front-end); this harness as the engine (orchestration + gating substrate). Complementary, not substitutes. No code integration recommended at this time.

This is a documentation/decision note only — no code changes.

Closes #10

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