chore(repo-hygiene): fix the 3 issues the audit framework's Tier-1 surfaced

- T1.2: LFS-track 40-data/information_source_map.json (2.9MB) +
eval/info_source_map.json (1.6MB) — were plain blobs in the HF Space
repo (1GB cap / pre-receive-hook risk). Content unchanged; now pointers.
- T1.4: add slash-less `tools/.pdf_text_cache` to .gitignore (the
trailing-slash file-vs-dir gap class that caused this session's symlink
build break).
- T1.5: untrack frontend/tsconfig.tsbuildinfo (regenerated build artifact)
+ gitignore *.tsbuildinfo.
Local only — not pushed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -137,3 +137,5 @@ rag/corpus/star-health/star-comprehensive__wordings.pdf filter=lfs diff=lfs merg
 rag/corpus/star-health/star-hospital-cash__brochure.pdf filter=lfs diff=lfs merge=lfs -text
 rag/corpus/regulatory/irdai-health-insurance-regulations-2016.pdf filter=lfs diff=lfs merge=lfs -text
 frontend/public/insurer-logos/*.png filter=lfs diff=lfs merge=lfs -text
+40-data/information_source_map.json filter=lfs diff=lfs merge=lfs -text
+eval/info_source_map.json filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -103,3 +103,5 @@ rag/extracted
 
 # local-only backup of pre-transparency logo originals
 _logo_originals_backup/
+tools/.pdf_text_cache
+*.tsbuildinfo