Polish cockpit how-question guidance

[RicheyWorks]

Summary

• Polishes /routing-demo.html with dedicated how-question guidance for interpreting routing decisions, reproducing local proof, reading edge cases, strategy-choice effects, and evidence support.
• Adds a browser-local Copy how-to reviewer explanation action with local/demo boundaries and not-proven limits.
• Updates docs/REVIEWER_TRUST_MAP.md discoverability for the cockpit how-question guide.
• Adds/updates guardrail tests for UI text, copied how-to content, trust-map discoverability, local/demo-only boundaries, and no-overclaim limits.

How-question inventory summary

• Already answered before this sprint: selected strategy/backend, input signal summaries, scenario deltas, degradation/recovery notes, evidence path, copy boundaries, and local/demo limits.
• Still unclear before this sprint: a dedicated interpretation sequence, reproduction steps, edge-case reading guide framing, strategy-choice effects, evidence-support meaning, and copyable how-to reviewer explanation.
• This PR fills those gaps while keeping the page static/browser-local and same-origin.

Core scope completed

• Added How to Interpret This Decision guidance.
• Added How to Reproduce This Proof steps.
• Added How to Read Edge Cases guidance.
• Added browser-local Copy how-to reviewer explanation action/text.
• Added tests for interpretation text, reproduction steps, edge cases, copy text/action, and safety boundaries.

Stretch scope completed

• Added How Strategy Choice Matters subsection.
• Added How Evidence Supports the Decision subsection.
• Added Cockpit How-Question Guide discoverability in docs/REVIEWER_TRUST_MAP.md.

Tests run

• mvn -q -Dtest=RoutingDecisionDemoTest,ReviewerTrustMapDocumentationTest,CockpitDiscoverabilityDocumentationTest,EnterpriseReadinessAuditDocumentationTest test - PASS
• mvn -q test - PASS
• mvn -q -DskipTests package - PASS
• mvn -B package - PASS, 1412 tests, 0 failures/errors/skips
• git diff --check - PASS
• scripts/smoke/enterprise-lab-workflow.ps1 -Package - PASS
• Packaged routing-demo.html resource check in target/classes and built JAR - PASS
• Extracted inline script node --check - PASS
• Loopback smoke for /routing-demo.html, linked static evidence pages, and /api/routing/compare - PASS
• Changed-file audits for secrets, unsafe commands, external calls/CDNs/telemetry, upload/share/server-side export/PDF/ZIP behavior, release/signing/registry/cloud/governance mutation commands, overclaims, generated target evidence, and test weakening - PASS

Safety boundaries

• Static dashboard/docs/tests only.
• No Java production/API/server/routing code changed.
• No real routing algorithm, proxy/network, cloud, registry, signing, release, or GitHub settings behavior changed.
• No external calls, CDNs, analytics, telemetry, upload/share endpoints, or server-side export/PDF/ZIP/file generation added.

Not-proven limits

• No production traffic proof.
• No live cloud proof.
• No real tenant proof.
• No registry publication proof.
• No container signing proof.
• No GitHub settings mutation proof.
• No production certification, SLA/SLO proof, or production-readiness claim.

Production code changed

• No.

Runtime behavior changed

• No routing/API/server behavior changed; static reviewer UI/docs/tests only.