plans/x265: record PROBE-RDO-ARBITER results — the self-optimizing axis, measured

[AdaWorldAPI]

Doc-only. Records the PROBE-RDO-ARBITER measurement in the x265 plan file — a commit that was pushed to this branch but never opened as a PR, so it has been sitting unmerged since 2026-07-19. Found by a stranded-work audit while shipping lance-graph#862.

What was measured: a free-energy mode arbiter dispatches MortonShift-vs-Residual per region by content (64/64 correct), and the adaptive composite beats the fixed pipeline by 36% after signal overhead. "Self-optimizing" becomes a number rather than a claim.

Full write-up lives on the lance-graph board as E-X265-RDO-ARBITER-1; this PR is the ndarray-side plan record only.

🤖 Generated with Claude Code

https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki

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Generated by Claude Code

Summary by CodeRabbit

• Documentation
  • Added a plan documenting a self-optimizing mode-selection probe for compression.
  • Recorded successful dispatch validation and adaptive mode-selection results.
  • Documented measured savings and the resulting PASS status.
  • Noted current modeling limitations and enhancements planned for a future version.

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 06d757e and cfe7991.

📒 Files selected for processing (1)

• .claude/plans/x265-sprite-replay-probe-v1.md

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📝 Walkthrough

Walkthrough

The probe plan adds a PROBE-RDO-ARBITER section with adaptive dispatch results, measured byte metrics, and a PASS→[H] verdict. It also documents v2 limitations around modeled residual rates and deferred rate-distortion exploration.

Changes

RDO arbiter probe

Layer / File(s)	Summary
Probe results and v2 caveat .claude/plans/x265-sprite-replay-probe-v1.md	Documents the three-axis arbiter model, dispatch outcomes, adaptive savings ratio, mode selection behavior, PASS→[H] result, and deferred real entropy-coder and larger-search-window work.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: claude

Poem

A rabbit watched the modes align,
Through Morton paths and μ-time fine.
The arbiter chose with nimble cheer,
Saving bytes as goals drew near.
“PASS!” I twitch—then plan v2!

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