chore(main): release 0.4.0

[github-actions]

🤖 I have created a release beep boop

0.4.0 (2026-09-15)

Features

• default guidance.routingSkill to true (opt-out) — the always-on card ships by default, hiding its deeper layer by default was inconsistent; the skill is advisory, lazy, ready-gated, and self-limiting (d1cf0ed)
• layer a bounded CGC HTTP API registry probe ahead of the cgc list fallback for marker-less indexedness (03d1e37)
• user-executable routing skill — discovery without the readiness race; agent-side pointer stays per-turn; PI_CODING_AGENT_DIR-aware global config (291ee70)

Bug Fixes

• classify indexedness via the CGC repository registry when the filesystem marker is absent (biome-formatted) (2dfd9f8)
• npm publish rides the Release Please run — GITHUB_TOKEN-created releases do not fire release-event workflows, so the publish is gated on the post-merge invocation's releases_created (release-publish.yml remains for manually-created releases) (3d15ced)
• SAFETY comments on the extension-API seam casts and the registry memoization (review-pass sweep of the pi-lens findings) (1c38756)

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[github-actions]

🤖 Created releases:

• v0.4.0

🌻