fix: sort glob results for deterministic file order

Problem

fast-glob returns files in arbitrary filesystem traversal order, which varies across runs on the same directory. This causes the bash tool's description string to differ between calls — the "Available files" section lists up to 8 files sampled from the front of the array, so a different ordering produces a different prompt, breaking prompt cache hits.

From the fast-glob README:

results are returned in arbitrary order

Fix

Sort the foundPaths array returned by fg() in both streamFiles and getFilePaths in src/files/loader.ts. This gives stable lexicographic order regardless of OS or filesystem traversal behavior.

The change is minimal — a single .sort() chained on each fg() call — and has no functional impact beyond ordering.

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