feat(enrichment): floating-promise / unhandled-rejection analyzer

[JSONbored]

New REES local analyzer (named in the #1499 epic 'Uncaught-rejection / floating-promise' idea) that flags newly-added async calls whose returned promise is neither awaited, returned, nor .catch()-chained on the same statement — a common silent-failure bug. Structural heuristic over added TS/JS lines, precision-first, no network. Scoped narrowly (single-statement expression call to a known-async/await-adjacent identifier) to keep false positives low.

Deliverables

• Add FloatingPromiseFinding ({ file, line, call: string }) + floatingPromise? key to review-enrichment/src/types.ts (call name truncated, no full expression)
• Create review-enrichment/src/analyzers/floating-promise.ts: match added statement lines that call a function returning a promise (e.g. bare foo.thenable() / somePromiseFn()) with no leading await/return and no trailing .catch/.then; conservative allowlist of promise-shaped call sites; cap with maxFindings
• Register a local descriptor (category 'quality', cost 'local', requires ['files']) with inline render() in review-enrichment/src/analyzers/registry.ts
• Add review-enrichment/test/floating-promise.test.ts covering a floating call flagged, awaited/returned/caught calls NOT flagged, non-JS/TS skip, and the cap

References

• review-enrichment/src/analyzers/redos.ts (precision-first structural local analyzer)
• review-enrichment/src/analyzers/registry.ts:158-175
• gh issue 1499 lists 'Uncaught-rejection / floating-promise + error-swallow analyzer' as a speculative idea

Part of #1499.

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size: S · gittensor:feature

[linear-code]

JSO-2140