docs: add missing H1 headings and fix HEARTBEAT template

docs/channels/irc.md

@@ -7,6 +7,8 @@ read_when:
   - You are configuring IRC allowlists, group policy, or mention gating
 ---
 
+# IRC
+
 Use IRC when you want OpenClaw in classic channels (`#room`) and direct messages.
 IRC ships as an extension plugin, but it is configured in the main config under `channels.irc`.
 

docs/concepts/features.md

@@ -5,6 +5,8 @@ read_when:
 title: "Features"
 ---
 
+# Features
+
 ## Highlights
 
 <Columns>

docs/gateway/network-model.md

@@ -5,6 +5,8 @@ read_when:
 title: "Network model"
 ---
 
+# Network Model
+
 Most operations flow through the Gateway (`openclaw gateway`), a single long-running
 process that owns channel connections and the WebSocket control plane.
 

docs/reference/credits.md

@@ -5,6 +5,8 @@ read_when:
 title: "Credits"
 ---
 
+# Credits
+
 ## The name
 
 OpenClaw = CLAW + TARDIS, because every space lobster needs a time and space machine.

docs/reference/templates/HEARTBEAT.md

@@ -5,8 +5,10 @@ read_when:
   - Bootstrapping a workspace manually
 ---
 
-# HEARTBEAT.md
+# HEARTBEAT.md Template
 
+```markdown
 # Keep this file empty (or with only comments) to skip heartbeat API calls.
 
 # Add tasks below when you want the agent to check something periodically.
+```

docs/start/docs-directory.md

@@ -5,6 +5,8 @@ read_when:
 title: "Docs directory"
 ---
 
+# Docs Directory
+
 <Note>
 This page is a curated index. If you are new, start with [Getting Started](/start/getting-started).
 For a complete map of the docs, see [Docs hubs](/start/hubs).