[rubas]

Drops the kagi agent skill. Release 0.6.0.

Before

install.sh installs ~/.agents/skills/kagi and links it into ~/.claude/skills, ~/.codex/skills, ~/.gemini/antigravity-cli/skills, and ~/.pi/agent/skills. The Home Manager module does the same.

Problem

• Our agents already have a search skill for the whole search CLI family, and the two skills pointed at each other.
• Two skills for one family split the knowledge and cost context on every session.

After

• The repo ships the three CLIs only. Releases, task install, and the Home Manager module no longer carry a skill.
• install.sh removes the skill and its links that releases up to 0.5.4 installed, together with the v0.4 per-binary dirs it already removed.
• The release smoke test checks that removal.

Details

• Deleted: skills/kagi/SKILL.md, its flag test in tests/cli.rs, the skill staging in release.yml and Taskfile.yml, postInstall and mkSkillFiles in flake.nix, and the docs.
• Version 0.5.4 to 0.6.0 in Cargo.toml, Cargo.lock, and flake.nix, so the next install.sh run on each machine removes the skill.
• task ci passed locally (fmt, lint with zizmor, tests, release check, nix build, machete, deny).
• install.sh v0.6.0 against a local archive in a scratch HOME with an old skill dir and two links: all removed, CLIs installed; a second run prints kagi 0.6.0 is current.
• Merges after the babel release that carries the merged search skill is installed.