chore(release): public-release readiness fixes for 1.1.18

- CHANGELOG.md now embeds full app-level release notes for submodule bumps.
- .env.example uses explicit CHANGE-ME placeholders instead of realistic-looking defaults.
- config.example comments describe the actual CONF_SECRETS mechanism.
- setup.sh summary no longer prints generated passwords to stdout.
- bootstrap.js fails hard instead of falling back to weak default passwords.

Note: submodule pins will be updated to v1.1.16 after the app PRs merge.

Co-Authored-By: Claude <noreply@anthropic.com>

config.example/sso-secrets.js.example

@@ -4,8 +4,8 @@
 // `./setup.sh` generates ./config/sso-secrets.js for you on first run; this file
 // documents the shape for manual editing / reference.
 //
-// The SSO app reads this via @simpleworkjs/conf (docker-entrypoint.sh symlinks
-// it to /app/conf/secrets.js). The app ignores the extra stack/bootstrap/
+// The SSO app reads this via @simpleworkjs/conf (docker-entrypoint.sh sets
+// CONF_SECRETS to point at it). The app ignores the extra stack/bootstrap/
 // serviceAccountPass keys (read by the orchestrator). Back this up off-host —
 // it holds all SSO secrets. Never commit ./config/.