build(cli): shrink publish artifact to unblock build-vscode download

The kilo-cli artifact ballooned from ~1 GB to 1.83 GB after the codebase
indexing PR started emitting external sourcemaps and copying tree-sitter
wasms per target. The resulting 1.83 GB artifact triggered a silent
partial-extract in actions/download-artifact@v4 during build-vscode,
causing the 2026-04-29 publish run to fail with 'CLI binary not found'.

- Skip external sourcemaps in release builds (~620 MB saved across
  12 targets); dev builds still emit maps for local debugging.
- Exclude any stray .map files from the CI artifact and skip zstd
  compression on binaries (saves ~60 s on upload and reduces the
  chance of partial-extract bugs on the download side).

Refs: PR #6966 (commit f74d54c4), run 25096325401

.github/workflows/publish.yml

@@ -96,7 +96,12 @@ jobs:
       - uses: actions/upload-artifact@v4
         with:
           name: kilo-cli
-          path: packages/opencode/dist
+          path: |
+            packages/opencode/dist
+            !packages/opencode/dist/**/*.map
+          # Binaries don't compress meaningfully; skip the ~60s zstd pass and
+          # reduce the chance of partial-extract bugs on the download side.
+          compression-level: 0
 
     outputs:
       version: ${{ needs.version.outputs.version }}