Simplify private cases and add Dokploy GitHub retrieval

[tanglearncode]

Summary

• reduce each private investigation case to one best-effort case.md file
• add an explicitly installed, read-only NeatContext extension for public Dokploy/dokploy evidence
• retrieve issues/comments, pull requests/files, releases, commits, comparisons, and version-pinned source line ranges
• bind the Dokploy domain profile to the extension's exact read capabilities
• document the trust boundary, unauthenticated GitHub rate limit, and step-by-step setup
• validate the extension package and private single-file boundary in CI

Safety

• hardcodes https://api.github.com and Dokploy/dokploy
• sends GET requests only and has no credential connection
• rejects cross-repository URLs, path traversal, unsafe refs, oversized responses, and binary/oversized source files
• keeps Team Library extension source inert until the user explicitly trusts and installs a managed snapshot
• labels retrieved GitHub content as untrusted evidence

Validation

• npm test — 16 tests pass; Team Library validator passes
• NeatContext native profile.inspect accepts profiles/dokploy.md
• packaged MCP process passes initialize and tools/list smoke test (8 tools)
• live smoke test retrieves issue #4898 and application.ts lines 94–100 at v0.29.13