[Mrun25]

File symlinks were falling through the directory check and being treated as source files. A link to source outside the workspace would then be read by buildFullMap, so unrelated files could enter the map and later chat context. Dangling links were also returned by the scan.

Only include regular files after handling directories. This skips file and directory symlinks without changing normal extension filtering or ignored directories.

Added a real temporary-filesystem regression covering external file links, internal aliases, dangling links, directory links, nested regular files, and the resulting full map.

Verification:

• Before the fix: 43 passed, 3 new regression assertions failed.
• After the fix, on the committed branch: npm test - 46 passed, 0 failed.
• node --check on both changed files and git diff --check pass.
• No API calls or paid services used. Tested locally on Linux; Windows symlink permissions were not tested.

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