Submit codeherd to mise official registry

[xico42]

Goal

Register codeherd in the mise official registry so users can install it with mise use codeherd@<version> instead of mise use github:xico42/codeherd@<version>.

Prerequisites

Blocked on #13 (release pipeline). Cannot submit until:

• At least one public GitHub release exists, tagged vX.Y.Z.
• Release assets follow OS+arch naming so mise's autodetection works (e.g. ch-<version>-linux-amd64.tar.gz, ch-<version>-darwin-arm64.tar.gz).
• Archive root contains the ch binary at a predictable path.
• Raw github backend install works end-to-end: mise use github:xico42/codeherd@<version> resolves, downloads, and runs.

Submission steps

1. Verify name availability in jdx/mise:registry/ — confirmed free as of 2026-05-28 for both codeherd.toml and ch.toml. Going with codeherd (descriptive, no squat risk).
2. Fork jdx/mise.
3. Add registry/codeherd.toml:

   backends = ["github:xico42/codeherd"]
   description = "CLI for parallel agentic coding sessions"
   os = ["linux", "macos"]
   test = { cmd = "ch --version", expected = "{{version}}" }

4. Open PR against jdx/mise:main. Reference the codeherd repo, link to a successful release, and mention the tier-1 backend (github).
5. Address review feedback. Common asks: bin name override if ch collides with another tool's binary on PATH, asset pattern override if autodetection picks the wrong archive.
6. Merge → users can mise use codeherd@<version>.

Tier

Tier 1 (github backend). Per mise registry policy, tier-1 submissions are routinely accepted when the release format is mise-friendly.

Acceptance criteria

• registry/codeherd.toml merged into jdx/mise:main.
• mise use codeherd@<latest> installs and ch --version reports the correct version on linux-amd64, linux-arm64, darwin-amd64, darwin-arm64.
• README install snippet updated to mention mise use codeherd@latest (drop the raw github: form once registry is live).