wright lint package: search, install, list, outdated, update, remove #844

Part of #616. Decisions: see the owner comments there.

Desired behavior

Users can discover, install, list, check, update, and remove lint rule packages from the command line.

Scope

wright lint package <search|install|list|outdated|update|remove>:

• search: GitHub Search API, topic:wrightkit-lint archived:false fork:false, paged; install by explicit repository URL works without the Topic.
• install: fetch into the store only; it does not activate the package in any project.
• list: source repository, path identity, and installed SHA for each stored package.
• outdated: reports unchanged, updated, unavailable, and error per package; applies nothing.
• update: applies one package or all; managed content that was edited locally is not replaced.
• remove: removes managed content only and preserves user-authored rules and unrelated files.
• Results follow the shared result model and renderers (ADR-0030).

Non-goals

Activating a package in a project, background or automatic updates, a hosted registry.

Acceptance criteria

• Each subcommand has a test against recorded responses covering success, unchanged, updated, unavailable, and error states.
• outdated never changes the store; update of one package leaves the others untouched.
• remove and update preserve a user-owned file in the same directory and refuse to replace a locally edited managed file.
• docs/cli/commands.md documents the subcommands.

Dependencies

The package store and fetch sub-issue.