feat(rust): add Rust language parser support (#224)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: gadievron <gadi@unpromptedcon.org>

Author: 3 people

ARCHITECTURE.md

@@ -28,7 +28,7 @@ flowchart TB
     subgraph py["Python engine — libs/openant-core"]
         cli["openant/cli.py<br/>argparse + cmd_* entry points"]
         scanner["core/scanner.py<br/>orchestration"]
-        parsers["parsers/&lt;lang&gt;/<br/>7 language front-ends"]
+        parsers["parsers/&lt;lang&gt;/<br/>9 language front-ends"]
         ctx["context/<br/>app context + threat model"]
         prompts["prompts/<br/>Stage 1 + Stage 2 prompt construction"]
         llm["utilities/llm/<br/>provider adapters, rate limit, cost"]

README.md

@@ -33,6 +33,7 @@ To submit your repo for scanning:
 - Ruby (beta)
 - Zig (beta)
 - Swift (beta)
+- Rust (beta)
 
 ## Credits
 
@@ -219,7 +220,7 @@ Things on the list, in no particular order:
 - **More provider adapters.** Ollama (local models), vLLM, Cohere, Mistral, Groq, Amazon Bedrock, Azure OpenAI — each is a small Python adapter recipe (plus a few Go wizard/probe touch-points if you want it offered by `openant setup llm`) per the contributor guide. Lower the barrier to local / on-prem inference.
 - **Subscription-based auth.** ChatGPT / Codex, Claude Pro / Max, and Gemini Advanced subscriptions don't currently grant API quota — users have to maintain a separate API-tier key per provider. OAuth-based adapters that ride the consumer subscription would close that gap.
 - **Cross-provider tool-call quirks.** All three shipped adapters support tool calling, but the long tail (parallel tool calls, strict-mode schema enforcement, retry semantics on partial JSON) behaves differently per provider. Real-world scans surface these — PRs welcome.
-- **More languages.** The supported-languages list above is current coverage. Rust, Java, C#, and Swift come up frequently.
+- **More languages.** The supported-languages list above is current coverage. Java and C# come up frequently.
 - **Hosted scan service.** Knostic offers free scans for OSS projects today via the form linked above; a self-serve API for trusted partners is a future possibility.
 
 PRs welcome on any of these — open an issue first if the scope is non-trivial so we can align before you build.