fix: Two parallel activation paths for llama agents (ENABLE_LLAMA_AGENT vs [agents.X] TOML) (#846)

- Remove ENABLE_LLAMA_AGENT conditional block from docker-compose generation
- Remove legacy agents-llama and agents-llama-all services from docker-compose.yml
- Remove llama bot user creation code (dev-qwen, dev-qwen-nightly) from lib/forge-setup.sh
- Remove FORGE_TOKEN_LLAMA/FORGE_PASS_LLAMA environment variables from .env.example
- Add migration error check that fails when ENABLE_LLAMA_AGENT=1 is found in .env
- Update documentation: remove agents-llama entries from AGENTS.md and lib/AGENTS.md
- Delete docs/agents-llama.md (legacy documentation)
- TOML [agents.X] sections in projects/*.toml is now the canonical activation path

bin/disinto

@@ -396,15 +396,16 @@ check_pipeline_stall = false
 # for local LLM inference. Each agent gets its own container with isolated
 # credentials and configuration.
 #
-# [agents.llama]
-#   base_url = "http://10.10.10.1:8081"
-#   model = "unsloth/Qwen3.5-35B-A3B"
-#   api_key = "sk-no-key-required"
-#   roles = ["dev"]
-#   forge_user = "dev-qwen"
-#   compact_pct = 60
-#   poll_interval = 60
-
+# Configure via [agents.X] sections:
+#   [agents.dev-qwen]
+#     base_url = "http://10.10.10.1:8081"
+#     model = "unsloth/Qwen3.5-35B-A3B"
+#     api_key = "sk-no-key-required"
+#     roles = ["dev"]
+#     forge_user = "dev-qwen"
+#     compact_pct = 60
+#     poll_interval = 60
+#
 # [mirrors]
 # github   = "git@github.com:user/repo.git"
 # codeberg = "git@codeberg.org:user/repo.git"
@@ -882,7 +883,6 @@ p.write_text(text)
     echo ""
     echo "[ensure] Forgejo admin user 'disinto-admin'"
     echo "[ensure] 8 bot users: dev-bot, review-bot, planner-bot, gardener-bot, vault-bot, supervisor-bot, predictor-bot, architect-bot"
-    echo "[ensure] 2 llama bot users: dev-qwen, dev-qwen-nightly"
     echo "[ensure] .profile repos for all bots"
     echo "[ensure] repo ${forge_repo} on Forgejo with collaborators"
     echo "[run]    preflight checks"
@@ -1078,19 +1078,6 @@ p.write_text(text)
     echo "Config:  CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1 saved to .env"
   fi
 
-  # Write local-Qwen dev agent env keys with safe defaults (#769)
-  if ! grep -q '^ENABLE_LLAMA_AGENT=' "$env_file" 2>/dev/null; then
-    cat >> "$env_file" <<'LLAMAENVEOF'
-
-# Local Qwen dev agent (optional) — set to 1 to enable
-ENABLE_LLAMA_AGENT=0
-FORGE_TOKEN_LLAMA=
-FORGE_PASS_LLAMA=
-ANTHROPIC_BASE_URL=
-LLAMAENVEOF
-    echo "Config:  ENABLE_LLAMA_AGENT keys written to .env (disabled by default)"
-  fi
-
   # Create labels on remote
   create_labels "$forge_repo" "$forge_url"