[rekram1-node]

Problem

A few exports in packages/opencode/src have no callers anywhere in the repo, and a bunch of files carry imports they never use.

Change

Cleanup only, no behavior change.

 installation/index.ts
-  getReleaseType, isPreview, ReleaseType
 util/repository.ts
-  isRepositoryError, RepositoryError
 util/filesystem.ts
-  readArrayBuffer
 server/shared/ui.ts
-  DEFAULT_CSP
 config/markdown.ts
-  fallbackSanitization

ReleaseType and RepositoryError were only used by the removed functions. I grepped the whole repo for each name first.

For unused imports I only removed two kinds, since verbatimModuleSyntax keeps value imports at runtime:

Kind	Removed?
import type { X } with no use	yes, erased at runtime anyway
unused name inside an import that keeps other names	yes, module still loads
whole value import with no other names	no, dropping it can change module load order

Out of scope

The whole value imports (for example MessageV2 in session/retry.ts, SessionV2 in session/session.ts) are left alone. patch/, acp/ and tool/tool.ts are untouched.

Verification

• bun typecheck in packages/opencode passes
• bun test test/tool/glob.test.ts test/tool/grep.test.ts test/tool/write.test.ts test/agent/agent.test.ts in packages/opencode: 66 pass