fix(razor): resolve @inject types across files

[hopstreax]

Summary

Fixes #3187.

Blazor .razor and .cshtml @inject directives were previously emitted as file-local imports stubs and never reached the C# cross-file type resolver. This caused each Razor file to create a duplicate node for the same project-defined service.

This change:

• Emits @inject as a references edge with C# resolver metadata.
• Creates unresolved @inject stubs without a Razor-local source_file.
• Allows .razor and .cshtml files to participate in the existing C# type-resolution pass.
• Preserves @using as an imports edge while adding the metadata required for namespace scoping.
• Protects Razor C# references from premature generic stub rewiring.
• Adds end-to-end regression tests for single and multiple Razor consumers, C# consumers, explicit @using, and qualified namespaces.

Validation

• tests/test_dotnet.py tests/test_csharp_type_resolution.py — 84 passed
• tests/test_languages.py -k "razor or csharp" — 20 passed
• tests/test_extract.py — 201 passed, 1 known Windows MAX_PATH failure
• git diff --check — clean

The known tests/test_extract.py failure is Windows-specific (MAX_PATH) and unrelated to this change.

[graphify-labs]

Graphify reviewed this change.

Worth a look — the grounded gate found no coupling regressions or blocking issues, but 2 advisory finding(s) below merit a look before merge.

---

Graphify review — findings

Extends .NET cross-file type resolution to treat .razor and .cshtml files as C# sources, so their inherits/implements/references edges get re-pointed and rewired to real definitions instead of dangling on shadow stubs. Reworks Razor @using to emit structured imports edges carrying using_kind/alias/target_fqn metadata (namespace, static, or alias forms), and changes @inject to produce a sourceless references node keyed by the injected type's ref token so it resolves to the project-defined service.

Worth a look

• @using regex now matches directive lines that are not namespace imports (e.g. @using var x = ...) — graphify/extractors/razor.py:41 · Escalate · medium
  • agreed by 2 of 2 members but NOT verified (no proof, no reproducing execution) — consensus is not a verdict; needs human review
• Razor using blocks are misclassified as namespace imports — graphify/extractors/razor.py:41 · Escalate · medium
  • agreed by 2 of 2 members but NOT verified (no proof, no reproducing execution) — consensus is not a verdict; needs human review

Analysis details — impact, health, verification

Impact & health

Graphify review

Impact — 1732 functions depend on the 308 functions this change touches.

Health — this change adds coupling hotspots:

• new: extract() — 504 callers, 42 callees
• new: _rebuild_code() — 98 callers, 50 callees
• new: extract_xaml() — 19 callers, 17 callees
• new: extract_js() — 85 callers, 3 callees
• new: dispatch_command() — 2 callers, 122 callees
• new: _get_extractor() — 26 callers, 6 callees
• new: run_pipeline() — 8 callers, 13 callees
• new: collect_files() — 17 callers, 6 callees
• …and 25 more — each is listed as a finding

Verification — 1732 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: 1575 function(s) in the blast radius were not formally verified this run

· 1 grounded finding(s) anchored inline below; 32 more finding(s) on lines outside this diff (see the check run).

[graphify-labs]

⚠️ Health regression — extract_razor()

14 callers depend on it (afferent coupling).

Grounded coupling-delta finding (deterministic), not an LLM guess.

[safishamsi]

Shipped in v0.9.52 via authorship-preserving cherry-pick. Thanks @hopstreax! This partially addresses #3187 (cross-file @Inject now resolves); a bare @Inject of a file-scoped-namespace type still dangles, so #3187 stays open for that follow-up. Release: https://github.com/Graphify-Labs/graphify/releases/tag/v0.9.52