docs: add missing title, remove stale description fields from frontmatter

docs/tools/diffs.md

@@ -1,7 +1,6 @@
 ---
 title: "Diffs"
 summary: "Read-only diff viewer and file renderer for agents (optional plugin tool)"
-description: "Use the optional Diffs plugin to render before and after text or unified patches as a gateway-hosted diff view, a file (PNG or PDF), or both."
 read_when:
   - You want agents to show code or markdown edits as diffs
   - You want a canvas-ready viewer URL or a rendered diff file

docs/tools/lobster.md

@@ -1,7 +1,6 @@
 ---
 title: Lobster
 summary: "Typed workflow runtime for OpenClaw with resumable approval gates."
-description: Typed workflow runtime for OpenClaw — composable pipelines with approval gates.
 read_when:
   - You want deterministic multi-step workflows with explicit approvals
   - You need to resume a workflow without re-running earlier steps

docs/tools/loop-detection.md

@@ -1,6 +1,5 @@
 ---
 title: "Tool-loop detection"
-description: "Configure optional guardrails for preventing repetitive or stalled tool-call loops"
 summary: "How to enable and tune guardrails that detect repetitive tool-call loops"
 read_when:
   - A user reports agents getting stuck repeating tool calls