Define v0.5 public evidence benchmark workflow

[ehsanestaji]

Summary

• Add a v0.5 public evidence workflow page for local smoke runs and public NCBI assembly evidence.
• Enrich the public assembly manifest with evidence role, expected scale, and downstream route fields.
• Carry those manifest fields through collect_evidence.py into evidence_summary.json and evidence_summary.tsv.
• Add guard tests for the public evidence manifest, doc page, and summary metadata columns.

Verification

• Red tests failed before implementation for missing manifest metadata, missing v0.5 evidence doc, and missing summary columns.
• python3 -m unittest discover -s tests/python
• cargo test --locked
• git diff --check
• git diff --cached --check
• Public wording scan for disallowed development-tool naming returned no matches.
• Local evidence smoke run: python3 scripts/collect_evidence.py --binary target/release/fastaguard --out-dir target/evidence/v0.5-local-smoke --local-only
• NCBI source URL checks returned HTTP 200 for GCF_000005845.2 and GCF_000182925.2.