Update Atlassian skill prereq checks

docs/ATLASSIAN.md

@@ -23,6 +23,8 @@ pnpm --dir skills/atlassian/shared/scripts sync:agents
 - `ATLASSIAN_EMAIL`
 - `ATLASSIAN_API_TOKEN`
 
+The `ATLASSIAN_*` values may come from the shell environment or a `.env` file in the installed agent-specific `scripts/` folder.
+
 Optional:
 
 - `ATLASSIAN_JIRA_BASE_URL`
@@ -121,9 +123,7 @@ Run in the installed `scripts/` folder:
 
 ```bash
 node -e "require.resolve('commander');require.resolve('dotenv');console.log('OK: runtime dependencies installed')"
-test -n \"$ATLASSIAN_BASE_URL\"
-test -n \"$ATLASSIAN_EMAIL\"
-test -n \"$ATLASSIAN_API_TOKEN\"
+node -e 'require("dotenv").config({ path: ".env" }); const required = ["ATLASSIAN_BASE_URL", "ATLASSIAN_EMAIL", "ATLASSIAN_API_TOKEN"]; const missing = required.filter((key) => !(process.env[key] || "").trim()); if (missing.length) { console.error("Missing required Atlassian config: " + missing.join(", ")); process.exit(1); } console.log("OK: Atlassian config present")'
 pnpm atlassian health
 ```