refactor(deploy): consolidate install scripts and INSTALL.md into deploy/

- Move scripts/install_mam.sh → deploy/install_mam.sh (local-clone installer)
- Move scripts/generate-env.sh → deploy/generate-env.sh (env helper)
- Move .agents/INSTALL.md → deploy/INSTALL.md (user manual)
- Update install_mam.sh to copy INSTALL.md + generate-env.sh from new paths
- Ship INSTALL.md via deploy/install.sh remote path too (manifest-tracked)
- Update README/BOOTSTRAP generate-env.sh references & repository ASCII layout
- Extend deploy/README.md structure section; extend gitea-ci.yml lint list
- Remove now-empty scripts/ directory
- Fix duplicate ### 2. subsection headers in deploy/README.md (address B-2)
- Correct deploy/INSTALL.md dependency description to match actual checks (address M-1)
- Add local-clone lifecycle caveat (no update.sh/remove.sh) (address M-2)

Closes the deploy consolidation plan and addresses Planner / Reviewer feedback.

README.md

@@ -172,8 +172,13 @@ To ensure communication integrity across public MQTT brokers, the backplane inte
 │   ├── agent-sessions.db        # SQLite WAL session database
 │   ├── agent-sessions.yaml      # Human-readable session registry
 │   └── jobs/                    # Asynchronous job metadata files
-├── scripts/
-│   └── generate-env.sh          # Environment bootstrap helper
+├── deploy/                      # Distribution and installation package
+│   ├── INSTALL.md               # User manual for installation and quick-start
+│   ├── install_mam.sh           # Local/Clone installer script
+│   ├── generate-env.sh          # Environment bootstrap helper
+│   ├── install.sh               # Remote/Network installer script
+│   ├── update.sh                # Updater script
+│   └── remove.sh                # Uninstaller script
 ├── BOOTSTRAP.md                 # Detailed installation and verification guide
 ├── MESSAGING.md                 # MQTT wire protocol specification
 └── README.md                    # Project introduction and overview (this file)
@@ -187,7 +192,7 @@ For detailed setup instructions, please consult the **[BOOTSTRAP.md](./BOOTSTRAP
 
 1.  **Initialize Environment Config:**
     ```bash
-    ./scripts/generate-env.sh
+    ./deploy/generate-env.sh
     ```
 2.  **Create Virtual Environment and Install Dependencies:**
     ```bash