docs: batch sentence-case headings across high-Title-Case offenders

- pi.md: 9 H2 + 14 H3 (Package Dependencies, File Structure, Tool Pipeline, etc.)
- cli/hooks.md: 6 H2 (List All Hooks, Get Hook Information, etc.)
- plugins/message-presentation.md: 8 H2 (Producer Examples, Renderer Contract, etc.)
- plan/ui-channels.md: 7 H2 (Non Goals, Target Model, Refactor Steps, etc.)
- install/ansible.md: 6 H2 + 1 H3 (What You Get, Quick Start, etc.)

Mintlify anchor generation prefers sentence case for predictable URLs.

docs/install/ansible.md

@@ -24,7 +24,7 @@ The [openclaw-ansible](https://github.com/openclaw/openclaw-ansible) repo is the
 | **Network** | Internet connection for package installation              |
 | **Ansible** | 2.14+ (installed automatically by the quick-start script) |
 
-## What You Get
+## What you get
 
 - **Firewall-first security** -- UFW + Docker isolation (only SSH + Tailscale accessible)
 - **Tailscale VPN** -- secure remote access without exposing services publicly
@@ -33,7 +33,7 @@ The [openclaw-ansible](https://github.com/openclaw/openclaw-ansible) repo is the
 - **Systemd integration** -- auto-start on boot with hardening
 - **One-command setup** -- complete deployment in minutes
 
-## Quick Start
+## Quick start
 
 One-command install:
 
@@ -41,7 +41,7 @@ One-command install:
 curl -fsSL https://raw.githubusercontent.com/openclaw/openclaw-ansible/main/install.sh | bash
 ```
 
-## What Gets Installed
+## What gets installed
 
 The Ansible playbook installs and configures:
 
@@ -86,7 +86,7 @@ backend. See [Sandboxing](/gateway/sandboxing) for details and other backends.
   </Step>
 </Steps>
 
-### Quick Commands
+### Quick commands
 
 ```bash
 # Check service status
@@ -103,7 +103,7 @@ sudo -i -u openclaw
 openclaw channels login
 ```
 
-## Security Architecture
+## Security architecture
 
 The deployment uses a 4-layer defense model:
 
@@ -122,7 +122,7 @@ Only port 22 (SSH) should be open. All other services (gateway, Docker) are lock
 
 Docker is installed for agent sandboxes (isolated tool execution), not for running the gateway itself. See [Multi-Agent Sandbox and Tools](/tools/multi-agent-sandbox-tools) for sandbox configuration.
 
-## Manual Installation
+## Manual installation
 
 If you prefer manual control over the automation:
 
@@ -216,7 +216,7 @@ This is idempotent and safe to run multiple times.
   </Accordion>
 </AccordionGroup>
 
-## Advanced Configuration
+## Advanced configuration
 
 For detailed security architecture and troubleshooting, see the openclaw-ansible repo: