fix: install SDK into CLAUDE_PLUGIN_ROOT for reliable ESM resolution

ESM import resolves packages relative to the importing file, not via
NODE_PATH. Previous approach (SDK in CLAUDE_PLUGIN_DATA with NODE_PATH)
failed because ESM ignores NODE_PATH.

New approach: SessionStart hook runs npm install in CLAUDE_PLUGIN_ROOT
itself, placing node_modules/ next to cli.mjs. ESM standard resolution
finds SDK naturally. Simpler bin wrapper, no NODE_PATH hacks.

Docs confirm CLAUDE_PLUGIN_ROOT is writable (but doesn't survive
plugin updates — SDK re-installs on update, which is fine).

Verified: LLM scan works (21 decisions, 8 from LLM, $0.39).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: George-iam

build.mjs

@@ -68,15 +68,6 @@ await build({
 mkdirSync("dist/plugin/bin", { recursive: true });
 writeFileSync("dist/plugin/bin/axme-code", `#!/bin/bash
 PLUGIN_DIR="\$(cd "\$(dirname "\$0")/.." && pwd)"
-if [ -n "\$CLAUDE_PLUGIN_DATA" ]; then
-  DATA_DIR="\$CLAUDE_PLUGIN_DATA"
-else
-  # Find plugin data dir by pattern (name varies: axme-code, axme-code-inline, etc.)
-  DATA_DIR="\$(ls -d \$HOME/.claude/plugins/data/axme-code* 2>/dev/null | head -1)"
-fi
-if [ -n "\$DATA_DIR" ]; then
-  export NODE_PATH="\$DATA_DIR/node_modules:\$NODE_PATH"
-fi
 exec node "\$PLUGIN_DIR/cli.mjs" "\$@"
 `);
 chmodSync("dist/plugin/bin/axme-code", 0o755);
@@ -105,9 +96,6 @@ writeFileSync("dist/plugin/.mcp.json", JSON.stringify({
     axme: {
       command: "node",
       args: ["${CLAUDE_PLUGIN_ROOT}/server.mjs"],
-      env: {
-        NODE_PATH: "${CLAUDE_PLUGIN_DATA}/node_modules",
-      },
     },
   },
 }, null, 2) + "\n");
@@ -119,7 +107,7 @@ writeFileSync("dist/plugin/hooks/hooks.json", JSON.stringify({
     SessionStart: [{
       hooks: [{
         type: "command",
-        command: "diff -q ${CLAUDE_PLUGIN_ROOT}/package.json ${CLAUDE_PLUGIN_DATA}/package.json >/dev/null 2>&1 || (mkdir -p ${CLAUDE_PLUGIN_DATA} && cp ${CLAUDE_PLUGIN_ROOT}/package.json ${CLAUDE_PLUGIN_DATA}/ && cd ${CLAUDE_PLUGIN_DATA} && npm install --omit=dev --ignore-scripts 2>/dev/null) ; NODE_PATH=${CLAUDE_PLUGIN_DATA}/node_modules node ${CLAUDE_PLUGIN_ROOT}/cli.mjs check-init",
+        command: "test -d ${CLAUDE_PLUGIN_ROOT}/node_modules/@anthropic-ai/claude-agent-sdk || (cd ${CLAUDE_PLUGIN_ROOT} && npm install --omit=dev --ignore-scripts 2>/dev/null) ; node ${CLAUDE_PLUGIN_ROOT}/cli.mjs check-init",
         timeout: 30,
       }],
     }],