fix(updater): repair dependencies during reinstall

[robbyczgw-cla]

Summary

Make the full hound --reinstall path process the dependencies declared by hound-mcp[all], so the repair command can restore missing core, browser, and OCR packages instead of reinstalling only the Hound wheel.

Type of change

• Bug fix (non-breaking)
• Reliability / hardening

Checklist

• The change is functional, not a cosmetic re-label of an existing capability.
• pytest tests/ passes locally: 765 passed, 5 deselected.
• New behavior has a test that fails without the production change.
• No new heavy module-level import in server.py.
• CHANGELOG.md updated under ## [Unreleased].
• No README, tool-schema, or configuration change is required.
• Package version surfaces are unchanged because this is not a release commit.

Notes for review

The patch is limited to the full reinstall command and its detached-helper equivalent. Normal updates and the lighter self-heal path keep their existing behavior.

Regression coverage checks that both direct and helper-generated full reinstalls allow pip to resolve [all] dependencies.

Fixes #30