Docs: Sync docs/roadmap-wave3.md to 12/13 language — only #1354 open

[PurHur]

Problem

docs/roadmap-wave3.md still lists 3 open language rows (#1354, #1360, #1366) and #1378 debug_backtrace as open. On master (May 2026 batch 67):

• Language: readonly classes (PHP 8.2+) #1360 readonly ✅, Language: WeakReference and WeakMap #1366 WeakMap ✅, Stdlib: debug_backtrace() — VM + LLVM JIT/AOT #1378 debug_backtrace ✅
• Only Language: PHP 8 attributes (#[Attr] on classes, methods, properties) #1354 attributes remains open

php script/check-wave3-roadmap-sync.php (#1802 ✅) fails until the doc matches reality. #1380 umbrella and #1751 close-out depend on accurate counts.

Goal

Refresh docs/roadmap-wave3.md:

Track	Target
Language (#1354–#1366)	11 closed, 1 open (#1354)
Stdlib (#1367–#1379)	13 closed, 0 open
M2 spine footnote	573/586 (compiler_lib_spine_smoke)

Regenerate capability footers if needed: php script/capability-syntax.php.

Implementation hints

Step	Command / file
Run checker	php script/check-wave3-roadmap-sync.php (must exit 0)
Edit summary table	docs/roadmap-wave3.md lines 9–16
Mark rows closed	#1360, #1366, #1378 → Closed + PR links
Spine count	grep -c '^require_once' test/selfhost/compiler_lib_spine_smoke/main.php
Umbrella	Comment on #1380 with new summary

Acceptance criteria

• php script/check-wave3-roadmap-sync.php exits 0
• test/unit/Wave3RoadmapSyncTest.php green
• Roadmap wave 3: full PHP language + stdlib gaps tracker (#1354–#1379) #1380 body or comment reflects 12/13 language + 13/13 stdlib

Verification (local / Docker only)

docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  php script/check-wave3-roadmap-sync.php
docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  ./script/ci-fast.sh --filter Wave3RoadmapSyncTest

No GitHub Actions.

Dependencies

• CI: Wave 3 roadmap drift guard (docs/roadmap-wave3.md vs #1380) #1802 ✅ — checker landed
• Wave 3 close-out: land remaining language + debug_backtrace (#1380 finish line) #1751 — wave 3 finish line (attributes)
• DevEx: check-m2-spine-issue-hygiene.php — close stale m2-spine-unit issues (#1808) #1812 — default-on ci-fast gate (after this doc PR)

Links

• Umbrella Roadmap wave 3: full PHP language + stdlib gaps tracker (#1354–#1379) #1380
• ROADMAP 🗺️ ROADMAP: Self-host + web-capable PHP subset (living) #78