docs: clarify state input reentry

[davidkpiano]

Summary

• clarify that transition input only applies when the target state is entered
• distinguish non-reentering preservation from reenter: true replacement
• make the state-input cheatsheet explicitly reenter before replacing input

Validation

• vitest --config packages/core/vitest.config.mts run packages/core/test/stateInput.test.ts (49 passed)
• git diff --check
• repository-local Markdown link scan (known docs-sync routes unchanged)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 071532b

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