Fix WarpGrep final result handling and bundle Morph SDK for OpenCode

[WDDGDA]

Summary

This fixes two OpenCode integration issues on Windows/local plugin installs:

• switch Morph SDK imports to narrow entrypoints instead of the root package
• bundle the Morph SDK compatibility layer with tsup
• avoid WarpGrep's streaming execution path for local codebase search in OpenCode, because the final streamed result can become unusable even when a direct execute succeeds

Root cause

warpgrep_codebase_search was using the streaming WarpGrep path. In OpenCode, that path could surface as:

Search failed: search returned no error details.

even though a direct WarpGrepClient.execute() on the same query and repo returned valid contexts.

The plugin now uses the non-streaming path for local WarpGrep execution, which preserves correct final results in OpenCode.

Changes

• replace root Morph SDK imports with narrow entrypoints
• call applyEdit directly for morph_edit
• change local WarpGrep execution to non-streaming
• build with tsup and noExternal for @morphllm/morphsdk
• add regression coverage for the import/build/runtime choices above

Verification

• npm run typecheck
• npm run build
• bun test
• verified real opencode run tool invocation for:
  • warpgrep_codebase_search
  • morph_edit