FastStrata v0.3.0

A new engine: with LODESTAR on, a turn's prompt is read in 7.7 s where it took 19.3 (the user's own OpenCode session
replayed on the 6 GB test laptop, the ready-made engines of v0.2.0 and of this release). The ready-made engine of this
release is a new file, strata-poly-windows-x64-59a3ba3a4a47ac90.zip (RTX 20 to RTX 50, CUDA 13.0).

• --prompt-cache-message N (step 11 of docs/OPTIMIZATION_LOG.md): the engine also keeps a checkpoint where the
  prompt's last message begins. The gateway's LODESTAR frame ends every prompt and the next prompt leaves it out; the
  Qwen3.6 model's recurrent layers could only go back to an older checkpoint, so every turn read 11,541 tokens again
  on that session, and now 2,640. Without LODESTAR the time is the same (5.0 s a turn). Off unless given; setup writes
  --prompt-cache-message 2048 on NVIDIA.
• Without the option the engine takes every prompt up where v0.2.0's does and reads the same tokens.