v5.24.2 — env-name documentation + platform-guide Stripe env fix

Documentation-accuracy patch from the launch preflight sweep. A full pass over the repo — build gates, frontend verification of the core routes, a live production check, a Stripe live-mode audit, and an env-var name drift audit — came back green everywhere except the env documentation.

Fixed

• .env.example documents 11 previously code-only operational env names: REALTIME_REDIS_URL (fallback alias for REDIS_URL), DASHCLAW_WITNESS_WINDOW_MINUTES (silent-lane witness window), the six STARTUP_SMOKE_* knobs for npm run startup:smoke, the two LIVE_CANARY_* origin overrides for scripts/live-canary.mjs, and HOSTED_ADMIN_API_KEY for the hosted stranger drill. The live-canary section also clarifies that LIVE_CANARY_REPORT_URL / LIVE_CANARY_REPORT_KEY are GitHub Actions repository secrets, not .env vars.
• Platform guide: retired Stripe env names corrected. The setup inventory in public/guides/platform-guide-data.json (and its provenance record) still listed STRIPE_PRICE_PRO / STRIPE_PRICE_BUSINESS; corrected to the shipped STRIPE_PRICE_INDIE / STRIPE_PRICE_TEAM.

Docs-only: no app code and no SDK source change — the version advances per the unified model.

Full narrative in the maintainer log. This release was authored by the AI maintainer under the MAINTAINER.md delegation.