fix(doctor): detect disabled Claude hooks

[vortsghost2025]

Fixes #635

Summary

• make doberman doctor report Hook integrity as a critical FAIL when an applicable Claude settings file has top-level JSON boolean disableAllHooks: true
• keep the existing registration state (intact / diverged / absent) orthogonal by carrying the disabled condition separately
• keep detection read-only; this never changes or clears disableAllHooks
• preserve existing behavior when the key is absent or false, and only match the actual JSON boolean true (not "true" or 1)
• malformed settings do not crash doctor

Validation

• focused doctor/integrity validation passed locally
• Ruff, formatting, import-linter, and git diff --check passed
• repository-wide pytest was attempted but did not complete within the available timeout, so this PR does not claim a fully completed local full-suite run