docs(pdftract-46tdo): add comprehensive troubleshooting guide with diagnostic code mappings
- Created troubleshooting.md mapping 22+ user-visible diagnostic codes
- Added symptom-to-diagnostic lookup table for quick navigation
- Each diagnostic code includes: what it means, cause, fix, severity
- Cross-references the Diagnostics Reference for full catalog
- Updated SUMMARY.md to include new troubleshooting guide
- Verified mdBook builds successfully
Acceptance criteria:
- Covers 15+ diagnostic codes (actual: 22+)
- Top-level TOC for navigation
- Cross-links to Diagnostic Code Catalog
- mdBook renders cleanly
Diagnostic codes covered:
XREF_REPAIRED, STREAM_BOMB, ENCRYPTION_UNSUPPORTED,
OCR_JBIG2_UNSUPPORTED, OCR_JPX_UNSUPPORTED, OCR_CCITT_UNSUPPORTED,
BROKENVECTOR_OCR_UNAVAILABLE, MCP_PATH_TRAVERSAL, PATH_OUTSIDE_ROOT,
URL_PRIVATE_NETWORK, CACHE_ENTRY_CORRUPT, CACHE_INTEGRITY_FAIL,
PROFILE_INVALID, PROFILE_SECRETS_FORBIDDEN, PAGE_OUT_OF_RANGE,
GLYPH_UNMAPPED, JAVASCRIPT_PRESENT, STRUCT_CIRCULAR_REF,
STRUCT_XOBJECT_CYCLE, GSTATE_STACK_OVERFLOW, REMOTE_FETCH_INTERRUPTED,
REMOTE_NO_RANGE_SUPPORT, TAGGED_PDF_STRUCT_TREE_DEFERRED
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