Technical-Debt Sweep — Remaining Work

The 2026-06 repo-wide technical-debt sweep (type safety, pattern coherence, logging coverage, duplication, layering, naming) landed across six waves; see git history for the full remediation record. One item from that sweep remains open.

Open: src/types/ filename-per-symbol alignment

OQ2 resolved that every concrete data-shape type alias ends *Type; that half is lint-enforced (type-alias-must-end-type in eslint-rules/noocodec.mjs). The second half — each file named for the single symbol it exports, mirroring the rule already enforced for src/interfaces/ (filename-matches-export) — is not yet applied or lint-enforced for src/types/.

Current state: 179 of 219 files under src/types/ end in Type.ts; 40 do not. Independent of naming, 38 files export more than one type from a single file (e.g. Compiler.ts, GraphEngine.ts, Registry.ts, Compose.ts, Infer.ts) and would need splitting, or an explicit allowlist predicate distinguishing a file's primary concrete type from generic/mapped helper types that may legitimately share its file, before a filename-matches-export rule could apply to src/types/** the way it already does to src/interfaces/**.