docs: fix P2s in configuration-reference -- built-in model catalog, PI_CODING_AGENT_DIR legacy note, deduplicate Identity section

docs/gateway/configuration-reference.md

@@ -2092,7 +2092,7 @@ Notes:
 
 ## Custom providers and base URLs
 
-OpenClaw uses the pi-coding-agent model catalog. Add custom providers via `models.providers` in config or `~/.openclaw/agents/<agentId>/agent/models.json`.
+OpenClaw uses the built-in model catalog. Add custom providers via `models.providers` in config or `~/.openclaw/agents/<agentId>/agent/models.json`.
 
 ```json5
 {
@@ -2121,7 +2121,7 @@ OpenClaw uses the pi-coding-agent model catalog. Add custom providers via `model
 ```
 
 - Use `authHeader: true` + `headers` for custom auth needs.
-- Override agent config root with `OPENCLAW_AGENT_DIR` (or `PI_CODING_AGENT_DIR`).
+- Override agent config root with `OPENCLAW_AGENT_DIR` (or `PI_CODING_AGENT_DIR`, a legacy environment variable alias).
 - Merge precedence for matching provider IDs:
   - Non-empty agent `models.json` `baseUrl` values win.
   - Non-empty agent `apiKey` values win only when that provider is not SecretRef-managed in current config/auth-profile context.
@@ -2680,7 +2680,7 @@ See [Multiple Gateways](/gateway/multiple-gateways).
 {
   gateway: {
     reload: {
-      mode: "hybrid",       // off | restart | hot | hybrid
+      mode: "hybrid", // off | restart | hot | hybrid
       debounceMs: 500,
       deferralTimeoutMs: 300000,
     },
@@ -3183,29 +3183,7 @@ Metadata written by CLI guided setup flows (`onboard`, `configure`, `doctor`):
 
 ## Identity
 
-```json5
-{
-  agents: {
-    list: [
-      {
-        id: "main",
-        identity: {
-          name: "Samantha",
-          theme: "helpful sloth",
-          emoji: "🦥",
-          avatar: "avatars/samantha.png",
-        },
-      },
-    ],
-  },
-}
-```
-
-Written by the macOS onboarding assistant. Derives defaults:
-
-- `messages.ackReaction` from `identity.emoji` (falls back to 👀)
-- `mentionPatterns` from `identity.name`/`identity.emoji`
-- `avatar` accepts: workspace-relative path, `http(s)` URL, or `data:` URI
+See `agents.list` identity fields under [Agent defaults](#agent-defaults).
 
 ---