docs(effort-log): mirror the Muse Code completion row

[jaywedgeworth22]

Docs-only mirror of the live effort-log completion row for board c4548ce2 / merged 1a4f69298 (#864), per the effort-log protocol.

Summary

• Adds a completion entry to docs/EFFORT-LOG.md for the Muse Code engine work merged in PR Add Muse Code engine, and hold the capability matrix to the drivers #864 as commit 1a4f69298.
• Records the successful squash/auto-merge and the green hosted validation gates across macOS, Ubuntu, Windows, smoke, lint, security, control-plane, package, Swift/iOS, and classification jobs.
• Documents the review corrections: removal of the unsupported max effort level and correction of the “Why This Engine” layout regression.
• Captures the merge-gate lesson that unresolved review threads can block a fully green pull request, along with notes about removing Playwright artifacts and avoiding branch changes during test runs.
• Notes the isolated local test failure as a load-related timing flake, while leaving the unverified real Muse Code turn and future adapter ownership decision explicitly open for follow-up.

This change updates the effort log only and does not alter application behavior.

[kody-ai]

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