feat(mcp): Add basic Docker MCP support

[shivasurya]

Summary

Extend MCP's find_symbol tool to recognize Docker node types, enabling basic Docker file queries.

Changes

• Add dockerfile_instruction and compose_service to validTypes map
• Add LSP Symbol Kind mapping for Docker types
• Include Docker statistics in get_index_info response

Testing

100% coverage, manual MCP queries verified with test Docker files

Depends On

None (foundation PR)

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.78%. Comparing base (b3dad5b) to head (1014ea8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   82.75%   82.78%   +0.02%     
==========================================
  Files         133      133              
  Lines       15666    15692      +26     
==========================================
+ Hits        12965    12991      +26     
  Misses       2221     2221              
  Partials      480      480              

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[github-actions]

Code Pathfinder Security Scan

Findings

Severity	File	Line	Issue
🟠 High	sast-engine/testdata/docker-project/Dockerfile	1	Missing Image Version	🔗
🟡 Medium	sast-engine/testdata/docker-project/Dockerfile	11	Multiple CMD Instructions	🔗
🟡 Medium	sast-engine/testdata/docker-project/Dockerfile	4	Sudo Usage in Dockerfile	🔗
🟡 Medium	sast-engine/testdata/docker-project/Dockerfile	6	Sudo Usage in Dockerfile	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	1	Dockerfile Source Not Pinned	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	4	Nonsensical Command	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	6	Nonsensical Command	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	4	Nonsensical Command	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	6	Nonsensical Command	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	4	Prefer apt-get over apt	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	6	Prefer apt-get over apt	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	11	Prefer JSON Notation for CMD/ENTRYPOINT	🔗
🔵 Low	sast-engine/testdata/docker-project/Dockerfile	2	Use Absolute Path in WORKDIR	🔗

Metric	Value
Files Scanned	4
Rules	38

---

_{Powered by Code Pathfinder}

[shivasurya]

• feat(mcp): Add Docker dependency graph mapping #535
• feat(mcp): Add semantic Docker query tools #534
• feat(mcp): Add basic Docker MCP support #531 👈 (View in Graphite)
• main

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