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fix: Pre-fill reader buffer on initialization (#11)

* feat: Pre-fill reader buffer on initialization

Implement initial pre-filling logic for `runeReader` buffers to
improve startup performance.

*   Bounded buffers pre-fill 25% of capacity.
*   Unbounded buffers pre-fill up to 64KB (2^16 runes).

Also adds tests for `State.Remaining()` behavior concerning the
newly introduced pre-filling step.

* Update parser/reader.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* fix: Correctly calculate prefillCount

The previous implementation used the bitwise XOR operator (`^`)
instead of the left shift operator (`<<`) to calculate 2^16.
Using `1 << 16` ensures the pre-fill count is correctly set to
65536 (64Kb).

* test: Check error returned by state Rollback

Adds an assertion to ensure that `st.Input.Rollback` returns
no error during the state ring buffer test execution.

Removes an unused constant `prefill`.

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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