Show mechanism graphs as diagrams alongside evidence tables

[realmarcin]

Summary

Record mechanism sections currently show edge tables without a graph visualization. Add build-time SVG with labeled nodes, directed arrows, predicates, hover/focus details and fit/full-size controls. Keep the evidence tables below each diagram.

Regenerate 361 graph-bearing record pages from the templates.

The renderer uses no external graph library or browser JavaScript. It retains isolated nodes, cycles, parallel edges and explicit placeholders for unresolved endpoints. Corpus records and scientific claims are unchanged.

Validation

• Focused SVG tests cover graph integrity, escaping, keyboard access and independent markers for multiple graphs.
• Generated-site drift check passes; Chromium confirms visible nodes/arrows and working fit/full-size controls.
• Changed Python files pass Ruff; git diff checks pass.

Part of the fleet graph visualization audit: existing TraitMech causal diagrams, CommunityMech interaction networks and the other existing corpus maps were verified in Chromium.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.