Complete TypeScript facts extraction

[pdd27673]

Summary

• resolve configured tsconfig.json baseUrl and paths aliases in modules, re-exports, and test attribution
• add a representative TypeScript and TSX fixture repository that passes refresh and check end to end
• require tsconfig.json for automatic TypeScript detection and refuse ambiguous Python/TypeScript initialization
• report unparseable TypeScript modules and canonical module-ID collisions instead of silently omitting them
• move Tree-sitter into the optional systemap[typescript] extra and document installation

Stack

• Depends on Add TypeScript language adapter #10
• Implements the TypeScript facts piece of Support non-Python projects, starting with TypeScript #9
• TypeScript-specific delta and history expansion remains for the third PR

Verification

• uv run pytest -q (387 passed)
• uv run pre-commit run --all-files
• uv run systemap refresh
• uv run systemap check
• uv run systemap judgement
• git diff --check

[0xfauzi]

This PR is reviewed as part of #12. #12 contains this PR's commits, so the review is in one place: see the comment there.

I suggest closing this PR and continuing in #12. The layers of the stack change each other's behaviour. For example, #11 makes tsconfig.json required to detect a TypeScript repository, which #10 did not. So merging this layer on its own would ship a state that the next layer replaces.

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