Codemble v0.21.0: learn-as-you-explore galaxy

[udhawan97]

Outcome

• adds free-explore or guided First Flight launch, explicit planet landing, Easy/Expert briefs, and the existing graph-derived quiz route
• deepens deterministic galaxy and planet rendering with reduced-motion and disposal coverage
• adds conservative Ruby and PHP parsers, semantic-oracle cases, and pinned Rails/Laravel corpus evidence
• rebuilds the bundled SPA, product captures, public guides, and reproducible v0.21.0 release facts

Verified

• 542 pytest cases and Ruff
• full web contract/build and docs check/build
• 48 Chromium/WebKit user-flow journeys, compact/reflow/reduced-motion gates
• 5,000-module backend/browser scale gate
• two council rounds plus targeted blocker closure
• reproducible wheel and sdist with matching SHA-256 manifests

Native Safari is not claimed: ScreenCaptureKit prevented the acceptance capture; WebKit evidence is recorded separately.