chore(bootstrap): migrate ACDL_* env vars to NOVA_* (complete the v1.15 P5 rename)

.ciagent/config.json

@@ -59,7 +59,7 @@
   },
   "git": {
     "branching_strategy": "flat",
-    "_branching_strategy_note": "ACDL uses flat workflow (committed directly to main per established convention since v1.0). The 'phase' strategy is advisory; CIAgent uses milestone/phase branches for v1.14 but the project convention is flat.",
+    "_branching_strategy_note": "Nova uses flat workflow (committed directly to main per established convention since v1.0; renamed ACDL→Nova in v1.15). The 'phase' strategy is advisory; CIAgent uses milestone/phase branches for v1.14 but the project convention is flat.",
     "auto_commit": true,
     "auto_push": true
   },
@@ -67,7 +67,7 @@
     "sources": [".env", ".env.secrets", ".env.*"],
     "disallow": ["shell_env", "netrc", "keychain", "rc_files", "global_config"],
     "scopes": {
-      "gitea": "ACDL_GITEA_TOKEN",
+      "gitea": "NOVA_GITEA_TOKEN",
       "github": "GITHUB_TOKEN",
       "gitlab": "GITLAB_TOKEN",
       "openai": "OPENAI_API_KEY",