fix(hooks): recognize absolute-path rtk hook claude in settings.json

[syf2211]

Summary

• Add claude_hook_command_matches() so hook detection recognizes absolute-path commands like /opt/homebrew/bin/rtk hook claude
• Use the helper in hook_check::binary_hook_registered and init::hook_already_present

Fixes #2884

Motivation

Users on macOS often configure Claude Code hooks with an absolute path to rtk because hook commands run under /bin/sh without Homebrew on PATH. rtk gain and rtk init -g incorrectly warned "No hook installed" even when the hook was active and tracking commands.

Changes

• src/hooks/hook_check.rs: new matcher + unit test; binary_hook_registered delegates to it
• src/hooks/init.rs: hook_already_present uses the shared matcher

Tests

• cargo fmt --all && cargo clippy --all-targets — passed
• cargo test hooks::hook_check — passed (14 tests)
• composer-2.5 review: APPROVE

Notes

Uninstall path (remove_hook_from_json) still uses exact matching for removal; detection is fixed here. A follow-up could reuse the helper for uninstall symmetry.

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[syf2211]

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[syf2211]

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