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

ReusableCapabilitiesArchitecture.md

@@ -55,7 +55,7 @@ A **Capability Implementation** is a concrete realization of a Capability Family
 
 **Characteristics:**
 - Provides **concrete functionality** (code, CLI, API)
-- May implement **multiple backend variants** (Gitea, GitHub, local)
+- May implement **multiple backend variants** (Forgejo, GitHub, local)
 - Has **maturity levels** (experimental, beta, production)
 - Can be **composed with other capabilities**
 
@@ -255,7 +255,7 @@ metadata:
   implementation: issue-core
   version: 1.0.0
   description: >
-    Unified interface for issue tracking across Gitea, GitHub, GitLab.
+    Unified interface for issue tracking across Forgejo, GitHub, GitLab.
     Enables agent coordination via standardized issue operations.
 
 purpose:
@@ -315,7 +315,7 @@ purpose:
     - "Unified issue management for polyglot platform environments"
 
   problems_solved:
-    - "Direct API calls to GitHub/GitLab/Gitea (avoids credential sprawl)"
+    - "Direct API calls to GitHub/GitLab/Forgejo (avoids credential sprawl)"
     - "Inconsistent issue tracking access patterns"
     - "Platform-specific code in agents"
     - "Offline/online workflow synchronization"
@@ -323,7 +323,7 @@ purpose:
 # When to use this capability
 usage_rules:
   MUST_USE_INSTEAD_OF:
-    - "Direct Gitea/GitHub/GitLab API calls"
+    - "Direct Forgejo/GitHub/GitLab API calls"
     - "Platform-specific CLIs (gh, glab)"
     - "Python libraries (PyGithub, python-gitlab)"
 
@@ -361,7 +361,7 @@ integration:
     required: true
     method: manual  # auto-detection planned for v1.1
     steps:
-      - "Export GITEA_API_TOKEN environment variable"
+      - "Export FORGEJO_TOKEN environment variable (GITEA_API_TOKEN is a deprecated alias)"
       - "Run: issue backend add myproject gitea"
       - "Provide: URL, owner, repo when prompted"
       - "Run: issue backend set-default myproject"
@@ -416,8 +416,8 @@ efficiency:
 credentials:
   method: environment_variables
   variables:
-    - GITEA_API_TOKEN
-    - GITEA_URL  # optional with config
+    - FORGEJO_TOKEN  # preferred; GITEA_API_TOKEN is a deprecated alias
+    - FORGEJO_URL  # optional with config; GITEA_URL deprecated alias
 
   security:
     - "Tokens never in code or logs"
@@ -736,7 +736,7 @@ metadata:
 ```
 Project A needs GitHub issues
 Project B needs GitLab issues
-Project C needs Gitea issues
+Project C needs Forgejo issues
 
 → Pattern: "We need issue tracking"
 → Family: "issue-tracking"