feat: make dispatch plan dynamically sized

[0ax1]

Replace the fixed-size DynamicDispatchPlan struct with a variable-length packed byte buffer, removing the MAX_STAGES and MAX_SCALAR_OPS limits.

[codspeed-hq]

Merging this PR will degrade performance by 15.51%

❌ 2 regressed benchmarks
✅ 1104 untouched benchmarks
⏩ 1522 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	bitwise_not_vortex_buffer_mut[128]	317.8 ns	376.1 ns	-15.51%
❌	Simulation	bitwise_not_vortex_buffer_mut[1024]	477.2 ns	535.6 ns	-10.89%

---

_{Comparing ad/check-max-shared-limit (b340968) with develop (6fade3c)}

Footnotes

1. 1522 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩