Refactor code structure for improved readability and maintainability; removed redundant code blocks and optimized function calls.

docs/reachability/corpus-plan.md

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+# Reachability Corpus Plan (QA-CORPUS-401-031)
+
+Objective
+- Build a multi-runtime reachability corpus (Go/.NET/Python/Rust) with EXPECT.yaml ground truths and captured traces.
+- Make fixtures CI-consumable to validate reachability scoring and VEX proofs continuously.
+
+Scope & deliverables
+- Fixture layout: `tests/reachability/corpus/<language>/<case>/`
+  - `expect.yaml` — states (`reachable|conditional|unreachable`), score, evidence refs.
+  - `callgraph.*.json` — static graphs per language.
+  - `runtime/*.ndjson` — traces/probes when available.
+  - `sbom.*.json` — CycloneDX/SPDX slices.
+  - `vex.openvex.json` — expected VEX statement.
+- CI integration: add corpus harness to `tests/reachability/StellaOps.Reachability.FixtureTests` to validate presence, schema, and determinism (hash manifest).
+- Offline posture: all artifacts deterministic, no external downloads; hashes recorded in manifest.
+
+MVP slice (proposed)
+- Go: `go-ssh-CVE-2020-9283-keyexchange`
+- .NET: `dotnet-kestrel-CVE-2023-44487-http2-rapid-reset`
+- Python: `python-django-CVE-2019-19844-sqli-like`
+- Rust: `rust-axum-header-parsing-TBD`
+
+Work plan
+1) Define shared manifest schema + hash manifest (NDJSON) under `tests/reachability/corpus/manifest.json`.
+2) For each MVP case, add minimal static callgraph + EXPECT.yaml with score/state and evidence links. (DONE: stub versions committed)
+3) Extend reachability fixture tests to cover corpus folders (presence, hashes, EXPECT.yaml schema). (DONE)
+4) Wire CI job to run the extended tests in `tests/reachability/StellaOps.Reachability.FixtureTests`. (TODO)
+5) Replace stubs with real callgraphs/traces and expand corpus after MVP passes CI. (TODO)
+
+Determinism rules
+- Sort JSON keys; round scores to 2dp; UTC times only if needed.
+- Stable ordering of files in manifests; hash with SHA-256.
+- No network calls during test or generation.