[rekram1-node]

Problem

packages/core had a few things nothing uses anymore, plus a stray one-line editor prompt (src/effect/dfdf) that got committed by mistake.

Change

Deletion only. I grepped the whole repo (all packages, tests, scripts, the ./* export pattern) before removing each one.

 packages/core/src/
-├── effect/dfdf                  # stray editor prompt
-├── public-event-manifest.ts     # never imported
 ├── shell.ts
-│   └── killTree()               # plus its now-unused imports and timeout const
 └── util/
     ├── binary.ts
-    │   └── Binary.insert()
     ├── hash.ts
-    │   └── Hash.sha256()
     └── path.ts
-        └── getFileExtension()

I also dropped the unused imports oxlint flags in packages/core (src and test). Bun strips unused imports at runtime and in bun build, even with verbatimModuleSyntax, so none of these were loading anything. I checked that with a tiny side-effect repro.

Out of scope

Unused variables oxlint reports in core (like aisdk and plugin). I only touched imports.

Verification

• bun typecheck in packages/core, packages/opencode, packages/app and packages/session-ui: pass
• bun test test/shell.test.ts test/npm.test.ts test/project.test.ts in packages/core: 21 pass