When stale cache retries exhaust (3 attempts), clear the expired entry
from localStorage and retry once without the expired_handle param.
Since handles are never reused (SPEC.md S0), the fresh response gets a
new handle and bypasses stale detection. This prevents shapes from being
permanently unloadable when a proxy strips cache-buster query params.

Also documents the server handle uniqueness guarantee (S0) in the spec,
updates the loop-back table for the new self-healing path, and resets
the recovery guard on up-to-date so self-healing remains available for
long-lived streams.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

The #expiredShapeRecoveryKey guard was only cleared in #onMessages when
an up-to-date batch arrived. The 204 backward-compatibility path
transitions directly to LiveState without going through #onMessages
(empty body → batch.length === 0 → early return), leaving the guard
stuck. This prevented a second self-healing cycle on the same stream
instance.

Clear the guard in #onInitialResponse when the response transitions
directly to live (action=accepted, state=live), covering the 204 path.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…test

The caughtError===null assertion was environment-sensitive: the fast-loop
detector's 500ms window can catch more requests on slower machines,
firing a 502 that's orthogonal to the recovery guard bug being tested.

The precise signal is selfHealCount===2: if the guard is stuck, the
code throws 502 *before* incrementing, so selfHealCount stays at 1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Two orthogonal CI fixes for the expired-shapes-cache test suite:

1. Silence stderr noise: many tests in this suite intentionally trigger
   stale-cache scenarios that produce expected console.warn output.
   Install a shared beforeEach spy that mocks console.warn for all
   tests (tests that need to assert on warnings still can, via
   warnSpy.mock.calls).

2. Prevent unhandled FetchError(502) from fast-loop detector:
   - "CDN always returns stale handle" test: add onError handler and
     poll until self-heal fires, then abort explicitly so the stream
     can't loop in the background until #checkFastLoop throws.
   - "204 recovery guard" test: add onError handler so the fast-loop
     detector (which the test's own comment acknowledges may race
     on slow runners) can't leak as an unhandled rejection.

Both tests still assert the same signals — this change affects test
plumbing only.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Package-local prettier 3.3.3 and root prettier 3.6.2 format markdown
blank-lines-before-lists differently. CI runs root prettier (strips the
line); the pre-commit hook picks up package-local prettier (re-adds it),
causing lint-staged to think the commit is empty when trying to fix CI.

Changesets auto-generates CHANGELOG files, so formatting them manually
isn't needed anyway.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Package-local prettier 3.3.3 formats markdown blank-lines-before-lists
differently than root prettier 3.6.2. CI runs root prettier; the pre-commit
hook picks up package-local prettier — they disagreed, causing lint-staged
to think every changelog fix was an empty commit.

- Bumped prettier to ^3.6.2 in experimental, react-hooks, start,
  typescript-client, y-electric, burn/assets, and redis packages
  (aligning with root 3.6.2; identified via sherif).
- Reverted the temporary CHANGELOG.md entry in .prettierignore now that
  the root cause is fixed.
- Reformatted both package CHANGELOG files with 3.6.2 to match CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Using bare "prettier --write" in lint-staged lets nano-spawn's PATH
resolution pick up globally-installed prettier (e.g. ~/.bun/bin/prettier
3.4.2) over the workspace's 3.6.2. That global version disagrees with CI
on markdown list formatting, causing the pre-commit hook to silently
revert the fix and then fail with "empty commit". Pointing explicitly at
node_modules/.bin/prettier guarantees lint-staged uses exactly the
version pnpm installed.

Also reformats the two CHANGELOGs that CI's format:check flagged.