diamond hunt: godot-0009/0010 + meson-0002 + typeorm-0004/0005 + ts-0003; count 629→635

New diamond recursion defects (O(2^D) → O(N)):
- godot-0009: Font::_is_cyclic no visited set — CJK fallback diamond, 2648x at F=4,D=8
- godot-0010: Font::_update_rids_fb no visited set — duplicate RIDs + O(N^2) hot path
- meson-0002: get_internal_static_libraries_recurse link_whole guard missing — 132x at D=10
- typescript-0003: hasBaseType inner check() no visited set — 1024x at D=10; hot on instanceof

New O(N²) defects:
- typeorm-0004: SubjectTopologicalSorter Array.indexOf dedup — 200x at N=400
- typeorm-0005: DepGraph.createDFS result.indexOf + addDependency edge dedup — 300x at N=600

CLEAN confirmed (diamond recursion sweep): bazel, cargo, cmake, composer, dgl, diesel,
doctrine-orm, efcore, helm, mybatis, networkx-deeper, ninja, npm-arborist, peewee, pip,
rubygems, seaorm, sqlalchemy, swift

UNDF: 571→578 assigned; MOAD count: 629→635

defects/helm/patch/helm-diamond-recursion-CLEAN.md

@@ -0,0 +1,26 @@
+## Diamond Recursion Scan — CLEAN
+
+**Scan date:** 2026-03-29
+**Pattern:** Recursive cycle/dependency check without visited set (CWE-407 diamond recursion, O(2^D))
+
+### Files examined
+
+- `pkg/chart/v2/util/dependencies.go` — `processDependencyEnabled`, `processDependencyImportValues`
+- `internal/chart/v3/util/dependencies.go` — same (v3 equivalent)
+- `pkg/chart/v2/lint/rules/dependencies.go` — `validateDependenciesUnique`
+- `pkg/engine/engine.go` — `recAllTpls`, `allTemplates`
+- `pkg/action/install.go` — `CheckDependencies`
+
+### Findings
+
+**processDependencyEnabled:** Recurses into sub-charts. However, Helm charts embed their dependencies as nested tarballs — the dependency tree is structurally a tree (each chart is a separate embedded copy), not a DAG with shared references. Diamond graphs are impossible in this structure. CLEAN.
+
+**recAllTpls:** Recurses through `accessor.Dependencies()` — same tree structure argument applies. No shared nodes, no diamond. CLEAN.
+
+**CheckDependencies:** O(R×D) nested loop — no recursion. CLEAN.
+
+**validateDependenciesUnique:** Iterates flat arrays, no recursion. CLEAN.
+
+Note: `helm-0001` through `helm-0003` cover pre-existing CWE-407 defects in release filtering and repo update operations.
+
+### Verdict: CLEAN — no diamond recursion CWE-407 found (Helm chart structure is a tree, not a DAG)