fix(detect): classify Jinja templates as documents (#3427)

[nikhilsaxena04]

The bug:
Jinja2 templates were completely skipped by Graphify's detection phase because their extensions were not listed in the recognized document extensions. This resulted in the source for generated files being hidden from the graph.

The fix:
Added .j2, .jinja, and .jinja2 to the DOC_EXTENSIONS set in graphify/detect.py.

Tests:
tests/test_detect_jinja.py added to verify the newly added Jinja extensions are accurately recognized as documents. This ensures the bug does not regress in future updates.

[graphify-labs]

Graphify reviewed this change.

Looks safe to merge — no coupling regressions and no blocking issues, checked against the code graph (not a self-assessment).

---

Graphify review — findings

Adds .j2, .jinja, and .jinja2 to DOC_EXTENSIONS so Jinja template files are classified and graphed as documents.

No blocking issues surfaced.

Analysis details — impact, health, verification

Impact & health

Graphify review

Impact — 2164 functions depend on the 121 functions this change touches.

Health — this change adds coupling hotspots:

• new: extract() — 563 callers, 43 callees
• new: _rebuild_code() — 115 callers, 51 callees
• new: detect() — 108 callers, 15 callees
• new: _extract_generic() — 18 callers, 26 callees
• new: save_manifest() — 40 callers, 11 callees
• new: extract_files_direct() — 17 callers, 20 callees
• new: extract_js() — 85 callers, 4 callees
• new: extract_xaml() — 19 callers, 17 callees
• …and 43 more — each is listed as a finding

Verification — 2164 functions in the blast radius were not formally verified this run (proofs are advisory here).

Gate & verification

graphify gate

PASS — objectively clean (no health regressions, tests not run — proofs not run this pass (advisory)). Grounded, not self-assessed.

Advisory (not blocking):

• verification_scope: 762 function(s) in the blast radius were not formally verified this run

Test selection

Test selection

51 of 263 test file(s) selected (19%) via static blast radius.

• tests/test_astro_extraction.py — impact
• tests/test_atomic_writes.py — impact
• tests/test_build.py — impact
• tests/test_charmap_encoding.py — impact
• tests/test_chunking.py — impact
• tests/test_cjs_module_extension.py — impact
• tests/test_claude_cli_backend.py — impact
• tests/test_cpp_nested_and_cli.py — impact
• tests/test_detect.py — impact
• tests/test_detect_jinja.py — changed-test
• tests/test_dotnet.py — impact
• tests/test_evidence_binding.py — impact
• tests/test_extract.py — impact
• tests/test_extract_cli.py — impact
• tests/test_file_slice.py — impact
• tests/test_ignore_file_encoding.py — impact
• tests/test_image_vision.py — impact
• tests/test_import_extension_resolution.py — impact
• tests/test_incremental_mtime_collision.py — impact
• tests/test_indirect_dispatch.py — impact
• tests/test_indirect_dispatch_assign_return.py — impact
• tests/test_indirect_dispatch_getattr.py — impact
• tests/test_js_exported_scalar_bindings.py — impact
• tests/test_languages.py — impact
• tests/test_llm_backends.py — impact
• tests/test_long_path_hashing.py — impact
• tests/test_manifest_ingest.py — impact
• tests/test_mcp_ingest.py — impact
• tests/test_multilang.py — impact
• tests/test_non_regular_files.py — impact
• tests/test_office_incremental.py — impact
• tests/test_office_limits.py — impact
• tests/test_ollama.py — impact
• tests/test_oversized_document_slicing.py — impact
• tests/test_package_json_subpath_imports.py — impact
• tests/test_pdf_slicing.py — impact
• tests/test_pdf_token_estimate.py — impact
• tests/test_phantom_external_import.py — impact
• tests/test_pipeline.py — impact
• tests/test_python_underscore_resolution.py — impact
• tests/test_rationale.py — impact
• tests/test_ruby_resolution.py — impact
• tests/test_scala_self_type.py — impact
• tests/test_stale_prune.py — impact
• tests/test_swift_computed_properties.py — impact
• tests/test_ts_new_expression_calls.py — impact
• tests/test_typescript_module_extensions.py — impact
• tests/test_unmapped_at_alias_resolution.py — impact
• tests/test_vue_extraction.py — impact
• tests/test_watch.py — impact
• … and 1 more

Selection is safe under the controlled-regression assumption; always-run tests + a periodic full run are the backstops. Advisory — it never changes the check verdict.

· 51 more finding(s) on lines outside this diff (see the check run).