backend-infra-engineer: Post v0.3.9-hotfix7 snapshot (build cleanup)

docs/internal/agents/archive/large-ref-docs/initiative-test-slimdown.md

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+# Initiative: Test Suite Slimdown & Gating
+
+## Goal
+Reduce test bloat, keep high-signal coverage, and gate optional AI/ROM/bench suites. Deliver lean default CI (stable + smokes) with optional nightly heavy suites.
+
+## Scope & Owners
+- **test-infrastructure-expert**: Owns harness/labels/CTests; flake triage and duplication removal.
+- **ai-infra-architect**: Owns AI/experimental/ROM gating logic (skip when keys/runtime missing).
+- **docs-janitor**: Updates docs (test/README, CI docs) for default vs optional suites.
+- **backend-infra-engineer**: CI pipeline changes (default vs nightly matrices).
+- **imgui-frontend-engineer**: Rendering/UI test pruning, keep one rendering suite.
+- **snes-emulator-expert**: Consult if emulator tests are affected.
+- **GEMINI_AUTOM**: Quick TODO fixes in tests (small, low-risk).
+
+## Deliverables
+1) Default test set: stable + e2e smokes (framework, dungeon editor, canvas); one rendering suite only.
+2) Optional suites gated: ROM-dependent, AI experimental, benchmarks (off by default); skip cleanly when missing ROM/keys.
+3) Prune duplicates: drop legacy rendering/e2e duplicates and legacy dungeon_editor_test if v2 covers it.
+4) Docs: Updated test/README and CI docs with clear run commands and labels.
+5) CI: PR/commit matrix runs lean set; nightly matrix runs optional suites.
+
+## Tasks
+- Inventory and prune
+  - Keep integration/dungeon_object_rendering_tests_new.cc; drop older rendering integration + e2e variants.
+  - Drop/retire dungeon_editor_test.cc (v1) if v2 covers current UI.
+- Gating
+  - Ensure yaze_test_experimental and rom_dependent suites are off by default; add labels/presets for nightly.
+  - AI tests skip gracefully if AI runtime/key missing.
+- CI changes
+  - PR: stable + smokes only; Nightly: add ROM + AI + bench.
+- Docs
+  - Update test/README.md and CI docs to reflect default vs optional suites and commands/labels.
+- Quick fixes
+  - Triage TODOs: compression header off-by-one, test_editor window/controller handling; fix or mark skipped with reason.
+
+## Success Criteria
+- CTest/CI default runs execute only stable + smokes and one rendering suite.
+- Optional suites runnable via label/preset; fail early if pre-reqs missing.
+- Documentation matches actual behavior.
+- No regressions in core stable tests.
+
+## Coordination
+- Post progress/hand-offs to coordination-board.md.
+- Use designated agent IDs above when claiming work.