docs(roadmap): overdue RustyNES lockstep re-check (v2.1.5 -> v2.1.10)

[doublegate]

Summary

Docs-only. Runs to-dos/LOCKSTEP-CHECKLIST.md's own process for the first time since its initial baseline entry (2026-07-11) — 8 RustySNES releases (v1.5.0-v1.12.0) had landed with no re-check in between.

• Appends a Lockstep-log row covering RustyNES v2.1.6-v2.1.10.
• Flags two items in to-dos/ROADMAP.md's "Milestones beyond the phases" for a maintainer go/no-go, per the checklist's own "don't silently cram it in" rule:
  • A GIF/WAV screen+audio capture subsystem (RustyNES v2.1.9) — no RustySNES equivalent anywhere in the roadmap.
  • CRT shader-preset depth — RustyNES ported 3 marquee libretro-slang presets vs. RustySNES's own single scanline+mask filter.
• Everything else (raw NTSC composite decode, a SIMD blitter/wasm-size pass, browser RA + Vs. DualSystem libretro) classified already-covered, small-catch-up (noted for v1.19.0), or correctly out of scope — detail in the log row itself.

No code changes, no roadmap commitments made — this only surfaces findings for a future decision.

Test plan

• markdownlint-cli2 on both touched docs — identical error count (10) vs. origin/main baseline, zero new findings

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request updates the project's roadmap and lockstep checklist documentation based on a re-check against RustyNES releases up to v2.1.10. Specifically, it logs new findings in to-dos/LOCKSTEP-CHECKLIST.md and flags two new features—a GIF/WAV capture subsystem and CRT shader-preset depth—in to-dos/ROADMAP.md as requiring a maintainer decision before being assigned to a roadmap rung. There are no review comments to address, and I have no additional feedback to provide.

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[Copilot]

Pull request overview

Docs-only update that re-runs the RustyNES↔RustySNES lockstep checklist and records the findings, surfacing potential roadmap gaps without committing to new scope.

Changes:

• Appends a 2026-07-12 entry to the lockstep log covering RustyNES v2.1.6–v2.1.10, with dispositions for each new item.
• Adds a flagged roadmap note calling out two RustyNES additions (capture subsystem + CRT preset depth) that don’t currently map to an existing RustySNES rung and need a maintainer go/no-go.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
to-dos/ROADMAP.md	Adds a “flagged by lockstep re-check” milestone note for maintainer decision-making on newly observed RustyNES scope.
to-dos/LOCKSTEP-CHECKLIST.md	Adds a new lockstep log row documenting the 2026-07-12 re-check and its dispositions.