recipe-maintainer: public snapshot (secrets + deployment plans removed, single commit)

Sanitized single-commit public mirror of recipe-maintainer.
- Removed test-ssh/.testenv (live creds); added test-ssh/.testenv.example placeholders.
- Removed plans/ and planned-updates/ (deployment-planning docs) so no client/
  deployment domains appear in the public repo.
- All other secret stores were already gitignored.
- docs.coopcloud.tech retained as a submodule (public upstream).

recipe-info/hedgedoc/test.md

@@ -0,0 +1,20 @@
+# HedgeDoc Tests
+
+## Target
+
+- **URL:** https://hedgedoc.<DOMAIN_SUFFIX>
+
+## Automated Checks
+
+Run the scripts in `tests/` to perform automated testing:
+
+- `health_check.py` — Confirms the instance is reachable and returns HTTP 200.
+- `create_note.py` — Creates a note via the API, downloads it, and verifies the content matches. Covers note creation and persistence.
+- `websocket_check.py` — Verifies the Socket.IO transport is responding with a valid handshake.
+
+## Manual Verification
+
+Full UI/UX testing (visual rendering, interactive editing experience) still benefits from human browser testing:
+
+1. Open https://hedgedoc.<DOMAIN_SUFFIX> in a browser.
+2. Confirm the HedgeDoc landing page loads without errors.