[maztah1]

Implements batched realtime subscriptions, cross-tab event fan-out, generated OpenAPI validators, and data freshness indicators across the landing and provider views.

• Coalesces topic subscribe/unsubscribe operations into bounded microtask batches, with immediate sends available for boundary-sensitive frames.
• Elects a WebSocket leader per app instance, forwards validated state/events, and promotes a follower after the lease expires.
• Generates stable realtime TypeScript types and Zod validators from the checked-in OpenAPI schemas, with a CI drift check.
• Adds per-view freshness labels and reconnect grace handling, and restores the oracle, claims, and pool data hooks.

Closes #265
Closes #266
Closes #267
Closes #264

Validation: generated-file drift check passed; focused realtime tests passed (9 tests); scoped TypeScript compilation passed; git diff --check passed. Full repository checks remain blocked by existing issues in the base branch: the TypeScript check reports JSX parse errors in src/app/cover/page.tsx, ESLint fails on the Literal[value=1e7] selector in .eslintrc.json, and package-lock.json is malformed so npm ci cannot run.

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