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perf(streaming): batch prop-driven source through rAF scheduler (#327) (#346)

* test(streaming): add red tests for prop-path rAF batching (plan 005)

Four intentionally-failing tests for the prop-driven streaming source
batching work (plan 005 / issue #327). Against current code the prop
path applies synchronously on every source change; these tests assert
the target batched behavior and fail on the batching assertions:

- same-frame append-only prop updates ⇒ one lexAndClean per frame
- non-append (reset) source wins over a pending append-only flush
- token-array source cancels a pending append-only flush
- unmount cancels a pending append-only flush

Red-phase snapshot; implementation follows in a subsequent commit.

Refs #327
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(guard): log plan 005 red-test checkpoint (ON TRACK)

Record guard checkpoint 1 for plan 005 (prop-path rAF batching): the
four red-phase tests fail on the batching assertion (not setup),
map 1:1 onto the plan's test plan and Done criteria, and cover both
assertable criteria. Scope clean; baseline-drift note carried for the
green checkpoint. Anchored to snapshot 57c82b2.

* perf(streaming): batch prop-driven source through rAF scheduler

Route append-only `source` prop growth through the same rAF-coalesced
flush the imperative writeChunk path uses, so N same-frame prop updates
collapse to one parse+diff+render instead of N. Non-append changes
(reset, shrink, token-array) stay synchronous and cancel any pending
prop flush so a stale flush can't clobber a reset.

- Add pendingStreamFullSource; unify append-buffer and full-source
  flushing under one entry point (flushPendingStreamChanges) and the
  existing streamFlushHandle — no second scheduler.
- Imperative writeChunk/applyAppendChunk drain a pending prop flush
  first so mode switches stay correct.
- teardown + $effect cleanup clear the pending full source.

Closes plan 005; resolves #327 pending me... (continued)

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