fix(build): externalize @slack/web-api in build:cjs + declare as root dep (#983)

build:cjs bundles the @agent-relay/slack-primitive workspace source, which
imports @slack/web-api. esbuild had to resolve+bundle it, but it isn't installed
in every publish context -> 'Could not resolve @slack/web-api' broke build:cjs
(and the agent-relay publish). Mirror the ssh2/better-sqlite3 pattern:
externalize @slack/web-api (loaded at runtime) AND declare it as a root
agent-relay dependency (^7.16.0, matching slack-primitive) so consumers resolve
it from node_modules. Hoists it to root in the lockfile (7.15.2 -> 7.16.0).

build:cjs now passes; @slack/web-api is a runtime require() in dist/index.cjs.

Co-authored-by: Proactive Runtime Bot <agent@agent-relay.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

package-lock.json

@@ -145,6 +145,7 @@
     "@relaycast/sdk": "^1.1.0",
     "@relayfile/local-mount": "^0.2.2",
     "@relayfile/sdk": "^0.6.0",
+    "@slack/web-api": "^7.16.0",
     "agent-trajectories": "^0.5.8",
     "commander": "^12.1.0",
     "dotenv": "^17.2.3",

package.json

@@ -14,8 +14,12 @@ await build({
   bundle: true,
   target: 'node18',
   logLevel: 'info',
-  // Exclude native dependencies from bundle - they're loaded dynamically at runtime
-  external: ['better-sqlite3', 'ssh2'],
+  // Exclude native dependencies from bundle - they're loaded dynamically at runtime.
+  // @slack/web-api lives in the @agent-relay/slack-primitive workspace (whose
+  // source is bundled here); keep it external + declared as a runtime dep so the
+  // CJS build doesn't have to resolve/bundle the Slack SDK (it isn't installed in
+  // every publish context) and consumers load it from node_modules at runtime.
+  external: ['better-sqlite3', 'ssh2', '@slack/web-api'],
   banner: {
     js: "const import_meta_url = require('node:url').pathToFileURL(__filename).href;",
   },