feat: add Convex-backed manual inference prepopulation

[anand-testcompare]

Summary

• add a new manualInferenceSessions Convex workflow with full lifecycle APIs (ensureSession, patchDraft, submitPrompt, answerQuestion, resetSession)
• add deterministic + optional LLM merge logic to prepopulate manual-entry fields and optionally ask focused follow-up questions
• wire Manual Entry UI to Convex realtime session state, including infer/reset actions, follow-up answer actions, and resilient draft syncing
• improve client resilience for transient Convex transport failures (timeouts, reconnect drops) so edits are not silently lost or stuck indefinitely
• add unit + integration tests for manual inference logic and session flow

Validation

• bun x ultracite check
• bun test packages/backend/convex/*.test.ts
• bun test apps/web/src/lib/*.test.ts
• bun run check-types
• bun run build
• coderabbit review --prompt-only -t uncommitted (completed once, findings fixed)

Notes

• d3k + agent-browser validation was run against http://localhost:5173 and the new Manual Entry controls/rendering and action wiring are in place.
• In the d3k browser environment specifically, Convex websocket reconnect churn (closed with code 1000) can cause transport timeouts unrelated to feature logic. This PR now uses bounded request timeout + retry/recovery handling instead of indefinite hangs.

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Project	Deployment	Actions	Updated (UTC)
cable-intel-web	Ready	Preview, Comment	Feb 24, 2026 2:50am