docs(plan): sync to v0.5.1345 — the 2026-08-07/08 wave

[proggeramlug]

Docs only. Adds a one-table summary of the v0.5.1324 → v0.5.1345 wave to docs/engine-plan.md, updates the sync date, names the remaining top levers in priority order, and lists the open gate debt — including the ordering constraint that #7554 (the gc-ratchet CI repair) must precede the next GC-pacing change, since #7594/#7596 both had to substitute hand-run both-arms A/Bs for the broken official gate.

Also records the now-named fix pattern for the "declared type as layout proof" bug class (#7573/#7603): runtime-funnel brand checks alone are insufficient — #7603 proved the inline-store codegen tiers never reach the runtime, so the pattern is funnel + codegen guards, verified by family A/B.

check_file_size.sh clean.

Summary by CodeRabbit

• Release

  • Updated the product version to 0.5.1346.

• Documentation

  • Added release notes covering recent engine synchronization, performance improvements, memory-safety fixes, and tooling updates.
  • Refreshed the engine plan with the latest synchronization status, measured results, completed work, and remaining items.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 16cab759-1d15-407c-8691-497941417245

📥 Commits

Reviewing files that changed from the base of the PR and between 53c118d and 45cb8e3.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• CLAUDE.md
• Cargo.toml
• changelog.d/7607-plan-sync-aug8.md
• docs/engine-plan.md

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📝 Walkthrough

Walkthrough

The project version was updated to 0.5.1346. The changelog and engine plan documentation now record the v0.5.1345 synchronization status, completed merges, performance priorities, and open infrastructure debt.

Changes

Version and engine plan synchronization

Layer / File(s)	Summary
Version marker updates CLAUDE.md, Cargo.toml	The documented and workspace package versions were incremented from 0.5.1345 to 0.5.1346.
Engine plan status record changelog.d/7607-plan-sync-aug8.md, docs/engine-plan.md	The changelog and engine plan document record the synchronization results, performance priorities, resolved issues, and open infrastructure debt.

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

Possibly related PRs

• PerryTS/perry#7345 — Updates the GC and engine plan status in docs/engine-plan.md.
• PerryTS/perry#7482 — Updates docs/engine-plan.md and related changelog documentation.
• PerryTS/perry#7534 — Updates the workspace version and engine plan documentation.

Suggested reviewers: jdalton, thehypnoo

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/plan-sync-aug8

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