fix(hive): keep HITL notification classification type-aware

[HsienW]

What & why

WorkerWake and the renderer currently classify Notification hooks independently, which allows mixed HITL and idle wording to fall through as idle when no authoritative notification type is available.

This change moves notification classification into a shared helper, treats known structured notification types as authoritative, and uses HITL first message heuristics only when the type is missing or unknown. It also passes notification_type through to WorkerWake and safely handles non string runtime values without changing the existing NDJSON framing or provider behavior.

Closes #676

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Docs
• Build / CI

Evidence

Before

The same mixed Notification is classified as idle on main:

Event:    Notification
Message:  Permission required — waiting for your input
Actual:   idle
Expected: needsHuman

After

The same Notification is classified as needsHuman after the fix:

Event:    Notification
Message:  Permission required — waiting for your input
Actual:   needsHuman
Expected: needsHuman

The focused WorkerWake regression suite also passes with all 22 tests:

tests 22
pass 22
fail 0

How I tested it

• OS: Windows 11
• Steps:
  1. Reproduced the current main behavior with the mixed Notification and confirmed it returns idle.
  2. Ran the same reproduction on this branch and confirmed it returns needsHuman.
  3. Ran:

     node --test test/worker-wake.test.cjs

     Result: 22/22 passed.
  4. Ran:

     npm run typecheck

     Result: both node and web typechecks passed.
  5. Ran:

     git diff --check

     Result: passed.
  6. Ran:

     npm run test:focused

     Result: 967 tests total, 924 passed, 29 failed, and 14 skipped. The remaining failures are existing Windows specific symlink, Electron only, CRLF regex, external data, and concurrency failures. No WorkerWake tests failed, and this branch introduced no new failures relative to the Windows baseline.

No Electron launch was required for the reproduction or focused verification.

Checklist

• Before and after evidence is attached above, under both headings.
• npm run typecheck passes.
• npm run test:focused passes.
• npm run build succeeds.
• This PR is one change. Unrelated fixes belong in their own PR.
• I read the diff myself before opening this, and there is no debug output,
  commented-out code, or unrelated formatting churn in it.
• Any new UI derives from DESIGN.md / tokens.ts — no ad-hoc colors,
  spacing, or fonts.
• If I added art, it's my own or compatibly licensed, and listed in
  ATTRIBUTION.md.