[Vivswan]

What this changes

nodesOf, a hand-rolled recursive generator  ->  estree-walker's walk(), through a six-line typed adapter

differential, old against new, visit order as (type, start, end):
  536 repository files        584,305 nodes    0 mismatches
  5,000 generated modules     258,520 nodes    0 mismatches (977 refused by both, same message)
negative control: an injected text -> problem import is refused identically

How

• The adapter exists because walk() is typed to estree's Node with no generic, so the oxc program crosses that boundary with one cast, the pattern refusal-messages.test.ts already uses.
• importSpecifiers passes its body as the visit callback; every thrown message is unchanged.
• Library: estree-walker 3.0.3, already a declared devDependency, covers the walk.

Proof

• Tests: arch-lint, gen-docs, and docs-registry suites, 88 pass; bun run lint:arch gives the same verdict.
• Gates: typecheck, fleet biome 0, member-shape 0, line cap.

Technical details

• Recorded, not built: oxc-parser 0.152 ships a typed Visitor (a per-node-type handler table, no casts); it would restructure isModuleLoad's switch into handler keys.
• Files: .github/scripts/arch-lint.ts.

[github-actions]

File size check

0 over a hard cap (fails), 6 warning(s).

File	Size	Tier	Cap
src/engine/diff.ts:56	11 comment lines	warn	10
src/github/api-error.ts:9	11 comment lines	warn	10
src/problem.ts:73	18 comment lines	warn	10
src/sections/contract/errors.ts:13	11 comment lines	warn	10
src/sections/contract/module.ts:55	12 comment lines	warn	10
src/sections/shared/list/decl.ts:265	14 comment lines	warn	10

Split the file, wrap the line, shorten or exempt the comment, or list the path in .file-size-allow.local with a # reason.

5 managed file(s) skipped; repo-platform owns them.

[Copilot]

🟢 Approval recommended

The focused refactor has no identified blocking defects, with existing coverage and reported differential checks supporting behavior preservation.

No open issues 🎉

What changed in this PR

Replaces arch-lint's custom recursive AST traversal with estree-walker, simplifying import analysis without changing its intended behavior.

Changes:

• Adds a typed adapter between oxc-parser nodes and estree-walker.
• Converts import collection to a visit callback, preserving filtering and refusal messages.

File	Description
.github/​scripts/​arch-lint.ts	Replaces nodesOf with the eachNode adapter and updates import collection.

_{Review effort: Balanced}