feat(events): form-library & non-JSX event adapters (B7/B8)

[officialCodeWork]

Step 3.4 — Form libraries & non-JSX events

Failure modes B7/B8. Events no longer have to be JSX on* props to be discovered.

• react-hook-form — <form onSubmit={handleSubmit(onValid)}> unwraps to the real handler onValid (the wrapped arg, not the handleSubmit() call); event sourced form.
• Formik — onSubmit on a <Formik>/<Form> tag treated as a submit handler.
• addEventListener — window.addEventListener("keydown", onKey) in an effect → event sourced effect.
• Hotkey libs — useHotkeys("ctrl+s", fn) (and useKeyboardShortcut/useKey/…) → event sourced hotkey, keyed by the shortcut.
• Unknown — an unresolvable event type is flagged unscanned-events, never dropped.

All routes funnel through one registerEvent helper that queues the handler for the existing effect-mining pass, so form/effect/hotkey handlers get the same navigate/fetch/dispatch/setState effect edges as JSX handlers.

Schema

EventNode gains optional source: "jsx" | "form" | "effect" | "hotkey"; JSON schema regenerated (drift gate green).

Eval

• b8-react-hook-form — handleSubmit(onValid) → POST /api/signup.
• b7-effect-listeners — keydown listener and ctrl+s hotkey → /api/save.

Verification

• 87 parser + 29 core tests pass (3 new event-source tests).
• pnpm eval: green, precision/recall 1.000.

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