fix(extension): bundle bin/axme-code as CJS, not ESM

The bundled binary in extension/bin/ has no file extension (shebang
script). Without a ".mjs" suffix or a sibling package.json declaring
"type":"module", Node loads the file as CJS and explodes on the
first ESM `import` statement at runtime:

  SyntaxError: Cannot use import statement outside a module
      at wrapSafe (node:internal/modules/cjs/loader:1378:20)

Surfaced when sideloading axme-code-dev.vsix into Cursor and trying
to run AXME: Setup or any axme MCP tool — the MCP server failed to
spawn, hooks crashed on first invocation.

Fix: change esbuild output from --format=esm to --format=cjs. The
shebang stays; the binary is now valid CJS that Node executes
without --experimental flags. Tested locally:
  extension/bin/axme-code --version  →  0.5.0  (was: SyntaxError)

Updates the publish-extension.yml CI step that runs the same
esbuild bundle inside the 5-platform matrix, so the Open VSX-
distributed .vsix files don't ship with the same crash.

#!axme pr=130 repo=AxmeAI/axme-code

Author: George-iam

.github/workflows/publish-extension.yml

@@ -65,23 +65,29 @@ jobs:
         shell: bash
         run: |
           mkdir -p extension/bin
-          # Bundle dist/cli.mjs into a single ESM file with everything inlined
-          # except @anthropic-ai/claude-agent-sdk (provided at runtime) and
-          # @cursor/sdk (loaded dynamically at runtime via optional dep).
+          # Bundle dist/cli.mjs into a single CJS file with everything
+          # inlined except @anthropic-ai/claude-agent-sdk (provided at
+          # runtime) and @cursor/sdk (loaded dynamically via optional dep).
+          #
+          # WHY CJS, not ESM: the output is a shebang script with no file
+          # extension (Windows uses .exe — see matrix.extension_bin).
+          # Without ".mjs" extension AND without a sibling package.json
+          # declaring "type":"module", Node loads the file as CJS and
+          # ESM import statements throw at runtime.
           npx esbuild dist/cli.mjs \
             --bundle \
             --platform=node \
             --target=node20 \
-            --format=esm \
+            --format=cjs \
             --external:@anthropic-ai/claude-agent-sdk \
             --external:@cursor/sdk \
-            --outfile=extension/bin/axme-code.mjs
+            --outfile=extension/bin/axme-code.cjs
           # Wrap in a shebang shim so it's executable as a binary.
           {
             printf '#!/usr/bin/env node\n'
-            cat extension/bin/axme-code.mjs
+            cat extension/bin/axme-code.cjs
           } > extension/bin/${{ matrix.extension_bin }}
-          rm extension/bin/axme-code.mjs
+          rm extension/bin/axme-code.cjs
           chmod +x extension/bin/${{ matrix.extension_bin }} || true
 
       - name: Install extension deps