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/README.md

@@ -12,7 +12,8 @@ This directory contains working examples of autonomous agents using the Issue Co
 
 2. **Configure backend** (one-time setup):
    ```bash
-   export GITEA_API_TOKEN="your-token"
+   export FORGEJO_TOKEN="your-token"
+   # Deprecated alias: GITEA_API_TOKEN
    issue backend add myproject gitea
    # Enter: URL, owner, repo when prompted
    issue backend set-default myproject
@@ -20,10 +21,11 @@ This directory contains working examples of autonomous agents using the Issue Co
 
 3. **Set environment variables** for scripts:
    ```bash
-   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
+   # Deprecated aliases: GITEA_URL, GITEA_TOKEN, GITEA_OWNER, GITEA_REPO
    ```
 
 ## Examples
@@ -212,7 +214,7 @@ issue backend add myproject gitea
 ### "Authentication failed"
 ```bash
 # Check token is valid
-curl -H "Authorization: token $GITEA_TOKEN" $GITEA_URL/api/v1/user
+curl -H "Authorization: token $FORGEJO_TOKEN" $FORGEJO_URL/api/v1/user
 ```
 
 ### "No issues found"