Remove remaining references to repositories this project does not publish #260

Problem

After the aictrl.dev link move, some references still point at repositories and services this project does not publish:

• packages/cli/src/installation/index.ts: Homebrew detection and upgrade use the anomalyco/tap/aictrl formula. No Homebrew formula is published from this repository.
• script/sync-zed.ts targets anomalyco/zed-extensions.
• .opencode/tool/github-triage.ts targets anomalyco/aictrl and assigns issues from a hard-coded list of another project's maintainers. It is disabled in .opencode/opencode.jsonc; it probably should be deleted rather than repointed.
• packages/containers/tauri-linux/Dockerfile defaults to ghcr.io/anomalyco.
• flake.nix calls ./nix/aictrl.nix, which does not exist, and nix/desktop.nix builds a desktop app that is not in this repository.

Proposed change

For each item, either point it at aictrl-dev/cli / aictrl.dev or delete it when nothing uses it. Brew: remove the tap upgrade branch unless a formula is published.

Acceptance criteria

• grep -rn anomalyco returns nothing outside history-only files.
• aictrl upgrade never runs a command against a formula, tap or script this project does not publish.
• CLI tests and typecheck pass.