Inconsistent counter naming: `executeCount` (AsyncBatcher, AsyncQueuer) vs `executionCount` (everywhere else)

Describe the bug

All sync utilities (Batcher, Queuer, Debouncer, Throttler, RateLimiter) and AsyncRetryer expose an executionCount field in their state, but AsyncBatcherState and AsyncQueuerState alone call the same concept executeCount:

This looks like an accidental divergence introduced in #54 (where the field was first added) rather than a deliberate distinction. Grammatically executionCount ("number of executions") is also the natural noun compound, consistent with the related maybeExecuteCount fields which are named after the maybeExecute method.

One could argue executeCount was meant to be distinct because it increments at execution start (and doubles as the key for the internal asyncRetryers map / getAbortSignal()), while the sync executionCount increments after completion. However, AsyncRetryerState.executionCount also increments at execution start yet uses the executionCount name — so the async utilities are inconsistent even among themselves, which suggests accidental divergence. If maintainers do consider the start/completion distinction meaningful, it would be worth documenting explicitly instead — either way the current state is confusing.

Proposal

Rename executeCount → executionCount in AsyncBatcherState and AsyncQueuerState (pure rename, no behavior change). Since Pacer is pre-1.0, this could ship as a minor with a changelog note calling out the rename.

Affected:

• packages/pacer/src/async-batcher.ts (state field, getAbortSignal(executeCount?) parameter, internals)
• packages/pacer/src/async-queuer.ts (same)
• Framework guide docs referencing executeCount (async-batching / async-queuing guides for react, preact, solid, angular, vanilla)

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Start in packages/pacer/src/async-batcher.ts and packages/pacer/src/async-queuer.ts, inspecting the state field, getAbortSignal parameter, and internal references. Update the async-batching and async-queuing framework guide references, then add the proposed changelog note. Done means all affected references use executionCount with no behavior change.