feat(install): add CodeBuddy Code support

[tirth8205]

Summary

Ports the viable CodeBuddy Code integration from #584 onto the current installer while preserving the original contributor's attribution.

• registers the official project .mcp.json / mcpServers contract and keeps the current JSONC-safe, no-data-loss merge behavior
• deduplicates only the exact Claude Code / CodeBuddy shared contract; unrelated clients that happen to share a path are still processed
• writes CODEBUDDY.md and .codebuddy/skills/<name>/SKILL.md
• installs .codebuddy/settings.json hooks for Edit|Write|Bash, preserving user settings and resolving the repository at hook runtime rather than embedding an install-machine path
• adds current CLI dispatch, installer regression coverage, and user/architecture documentation

The layout is checked against CodeBuddy's current official MCP, skills, and hooks documentation.

Attribution

Source contribution: #584 by @chuckiefan, exact reviewed head b92f4bd69b9aa7fed0873acad187daeb808535b3.

The implementation commit includes:

Co-Authored-By: Chuckiefan <chuckiefan@163.com>

Validation

• TDD: the nine new CodeBuddy contract tests failed before implementation and passed afterward
• focused installer/CLI/docs: 184 passed
• complete Python suite: 1492 passed, 2 xpassed
  • on macOS, the installed native FSEvents extension bus-faults during watcher teardown; the complete run used watchdog's polling observer as a test-only backend and exercised all watcher tests
• changed-file Ruff: clean
• git diff --check: clean
• graph review: risk 0.40, no affected execution flows

[github-actions]

code-review-graph review

Overall risk: 0.80 (HIGH) — 24 changed function(s)/class(es), 0 affected flow(s), 13 test gap(s)

Risk-scored changes

Risk	Level	Symbol	Location	Tested
0.80	high	code_review_graph/cli.py::_handle_init	code_review_graph/cli.py:189	no
0.65	medium	code_review_graph/skills.py::_merge_hooks_into_settings	code_review_graph/skills.py:889	no
0.55	medium	code_review_graph/skills.py::install_codebuddy_hooks	code_review_graph/skills.py:948	no
0.40	medium	code_review_graph/skills.py::install_platform_configs	code_review_graph/skills.py:412	no
0.40	medium	code_review_graph/skills.py::_record_configured	code_review_graph/skills.py:459	no
0.40	medium	code_review_graph/skills.py::install_hooks	code_review_graph/skills.py:930	no
0.30	low	code_review_graph/skills.py::install_codebuddy_skills	code_review_graph/skills.py:1327	no
0.30	low	tests/test_cli_install.py::_generate_skills	tests/test_cli_install.py:130	no
0.30	low	tests/test_cli_install.py::_install_codebuddy_skills	tests/test_cli_install.py:134	no
0.30	low	tests/test_cli_install.py::_install_codebuddy_hooks	tests/test_cli_install.py:138	no

Test gaps

• code_review_graph/cli.py::_handle_init (code_review_graph/cli.py:189)
• code_review_graph/skills.py::install_platform_configs (code_review_graph/skills.py:412)
• code_review_graph/skills.py::_record_configured (code_review_graph/skills.py:459)
• code_review_graph/skills.py::_merge_hooks_into_settings (code_review_graph/skills.py:889)
• code_review_graph/skills.py::install_hooks (code_review_graph/skills.py:930)
• ...and 8 more without direct tests

Token savings: this graph-backed report used ~62,262 fewer tokens (~93%) than reading every changed file in full (estimated, chars/4 approximation).

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