feat(skill): install bundled agent skill

[samzong]

What's changed?

• Add kitup 0.1.1 as the bundled skill installer dependency.
• Add recall skill install with --scope, --agent, --dry-run, and --yes support.
• Embed the existing Recall skill bundle and cover the new CLI parsing path.

Why

• Let Recall install its bundled Agent Skill through kitup's conflict-safe ownership workflow.

Verification

• cargo search kitup --limit 1
• cargo check
• cargo run -- skill install --scope user --agent codex --dry-run --yes with a temporary HOME
• cargo test cli::tests::skill_install_accepts_kitup_flags
• cargo test cli::tests
• make check
• /pre-ship --committed (MUST-FIX 0, deferred 0)

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Honor explicit --scope before prompting

When recall skill install --scope project is used, this still passes scope_set: false, so kitup is told the user did not provide a scope even though scope is Some("project"). Because the workflow is also configured with default_scope: User and prompt_scope: true, explicit non-default scope selection can be re-prompted or treated as policy/default-selected rather than user-selected; set this from whether the CLI scope argument was present before moving scope into the flag parser.

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