docs(ISSUE-WP-0006): Forgejo-only language and projection boundary

Prefer Forgejo as the self-hosted forge product. Keep Gitea only as the
Gitea-compatible API identifier (module backends/gitea, type string
gitea). FORGEJO_TOKEN is preferred; GITEA_* remains a deprecated alias.

INTENT/SCOPE quote ACT-ADR-005: issue-core is not the fleet ops claim
queue. Connector docs describe repo work record → hub index → optional
Forgejo projection, not activity-core → issue-core → harness.

Assistant: grok
Assistant-Session: 01a09dc6-3f0d-7c93-8b11-8e83c0623d49

examples/agents/monitoring_agent.py

@@ -9,10 +9,10 @@ This agent monitors issue health and sends alerts:
 - Reports on project velocity and bottlenecks
 
 Usage:
-    export GITEA_URL=https://gitea.example.com
-    export GITEA_TOKEN=your-token
-    export GITEA_OWNER=your-org
-    export GITEA_REPO=your-repo
+    export FORGEJO_URL=https://forgejo.example.com
+    export FORGEJO_TOKEN=your-token
+    export FORGEJO_OWNER=your-org
+    export FORGEJO_REPO=your-repo
 
     python monitoring_agent.py [--stale-days=7] [--check-interval=3600]
 """
@@ -42,11 +42,11 @@ class MonitoringAgent:
         self.backend = None
 
     def connect(self):
-        """Connect to backend."""
-        base_url = os.environ['GITEA_URL']
-        token = os.environ['GITEA_TOKEN']
-        owner = os.environ['GITEA_OWNER']
-        repo = os.environ['GITEA_REPO']
+        """Connect to Forgejo backend."""
+        base_url = os.environ.get('FORGEJO_URL') or os.environ['GITEA_URL']
+        token = os.environ.get('FORGEJO_TOKEN') or os.environ.get('FORGEJO_API_TOKEN') or os.environ['GITEA_TOKEN']
+        owner = os.environ.get('FORGEJO_OWNER') or os.environ['GITEA_OWNER']
+        repo = os.environ.get('FORGEJO_REPO') or os.environ['GITEA_REPO']
 
         self.backend = GiteaBackend()
         self.backend.connect({