feat(catalog): add herdr (agent terminal multiplexer)

[CybotTM]

Summary

• Adds catalog/herdr.json for herdr (Apache-2.0, Rust): a terminal multiplexer that runs coding agents (Claude Code, Codex, …) in panes with idle/working/blocked status.
• Install via github_release_binary: upstream ships raw linux binaries (herdr-linux-x86_64, herdr-linux-aarch64) — no archive, no armv7l build, so arch_map covers those two only.
• bash_completion uses herdr completion bash; guide.order 403 puts it after claude (400), codex (401), gemini (402).

Upstream also offers install.sh, brew, mise, nix and a self-updater (herdr update). The entry installs from GitHub releases so the version is tracked like every other cataloged tool; recorded in notes.

Linked issues / PRs

None.

Type of change

• New feature (feat:)

Test plan

• uv run pytest — 793 passed, 1 skipped
• uv run python -m flake8 cli_audit tests — 9 findings, all pre-existing on main in files this PR does not touch
• ./scripts/test_smoke.sh — [smoke] OK
• Downloaded v0.8.0 and ran the binary: herdr --version → herdr 0.8.0 (parses with default detection, no version_command needed); herdr completion bash emits a valid _herdr() function
• collect_github('herdrdev','herdr') → v0.8.0 via the releases/latest redirect

Checklist

• Conventional Commits (type(scope): description)
• Commits signed (git commit -S --signoff)
• CHANGELOG.md updated for user-visible changes
• Relevant AGENTS.md files updated if structure / commands changed — no structure or command changes
• No secrets, credentials, or PII committed

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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[CybotTM]

Copilot could not review this PR. Both requests against ffe433c came back as an error row, not a review:

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

A quota ceiling does not clear by re-requesting, so no third attempt. Review done by hand instead — what was checked, beyond the test plan in the description:

• Both release asset URLs the template generates return 200: herdr-linux-x86_64, herdr-linux-aarch64 (v0.8.0).
• binary_name: herdr is unique across all 105 catalog entries, so the bash_completion declaration cannot overwrite another tool's completion file.
• guide.order: 403 is free and continues the AI block (claude 400, codex 401, gemini 402).
• install_action: "install" matches the other github_release_binary guide entries (kubectl 203, symfony 265); for this method install and update are the same code path.
• Version detection: the v0.8.0 binary prints herdr 0.8.0, which the installer's default --version path parses — no version_command needed.
• Upstream resolution: collect_github('herdrdev','herdr') returns v0.8.0 via the releases/latest redirect.

Not verified: an end-to-end scripts/install_tool.sh herdr run. It installs into ~/.local/bin plus a completion file into ~/.local/share; every step it performs is covered individually above.

Checks: 20 passed, 0 failed, 4 skipped. Unresolved threads: 0.