What Problem This Solves

The private browser plugin implementation still exported 15 declarations that have no consumers outside their defining modules. Those exports expanded the apparent internal API without providing a supported package surface.

Why This Change Was Made

Localize the unused declarations at their ownership sites across eight browser implementation modules. The browser plugin's package barrels and runtime API continue to expose the same supported surface.

This is an export-only cleanup: 15 declarations changed from exported to module-local, with 15 insertions and 15 deletions.

User Impact

None expected. Runtime behavior, public browser plugin APIs, and package exports are unchanged.

Evidence

• Base: 9dbb1ed3d24655a144be1fe58a652f13ebe9f311
• Head: e260600c10667a9c302dd959b0db0ba69813a4b7
• Codebase graph after the change: 21,043 files, 281,319 nodes, 1,138,868 edges, zero extraction errors.
• Repository-wide AST and text searches found no consumers for the 15 removed exports.
• OPENCLAW_TESTBOX=1 pnpm check:changed: passed for extensions and extensionTests, including extension typechecks, changed-file lint, guards, and import-cycle checks.
• Targeted browser Testbox lane: 11 files passed, 358 tests passed.
• Full browser shard on this branch: 5 files and 13 tests failed, with 128 files and 1,522 tests passing and 1 skipped.
• The identical full browser shard on a clean detached checkout of the current base failed in the same 5 files and 13 tests, including stale SSRF expectations and Response.arrayBuffer mock gaps. These failures are current-main drift and unrelated to this export-only diff.
• Fresh local autoreview: clean, 0.91 confidence.
• Fresh committed-branch autoreview: clean, 0.90 confidence.
• git diff --check: passed.

AI Assistance

AI-assisted code search, editing, review, and validation were used. No agent transcript is attached.