Add community skills, agents, system prompts from 22+ sources

Community Skills (32):
- jat: jat-start, jat-verify, jat-complete
- pi-mono: codex-cli, codex-5.3-prompting, interactive-shell
- picoclaw: github, weather, tmux, summarize, skill-creator
- dyad: 18 skills (swarm-to-plan, multi-pr-review, fix-issue, lint, etc.)
- dexter: dcf valuation skill

Agents (23):
- pi-mono subagents: scout, planner, reviewer, worker
- toad: 19 agent configs (Claude, Codex, Gemini, Copilot, OpenCode, etc.)

System Prompts (91):
- Anthropic: 15 Claude prompts (opus-4.6, code, cowork, etc.)
- OpenAI: 49 GPT prompts (gpt-5 series, o3, o4-mini, tools)
- Google: 13 Gemini prompts (2.5-pro, 3-pro, workspace, cli)
- xAI: 5 Grok prompts
- Other: 9 misc prompts (Notion, Raycast, Warp, Kagi, etc.)

Hooks (9):
- JAT hooks for session management, signal tracking, activity logging

Prompts (6):
- pi-mono templates for PR review, issue analysis, changelog audit

Sources analyzed: jat, ralph-desktop, toad, pi-mono, cmux, pi-interactive-shell,
craft-agents-oss, dexter, picoclaw, dyad, system_prompts_leaks, Prometheus,
zed, clawdbot, OS-Copilot, and more

hooks/community/jat/post-bash-agent-state-refresh.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+#
+# Post-Bash Hook: Agent State Refresh
+#
+# Detects when agent coordination commands are executed and triggers
+# statusline refresh by outputting a message (which becomes a conversation
+# message, which triggers statusline update).
+#
+# Monitored commands:
+#   - am-* (Agent Mail: reserve, release, send, reply, ack, etc.)
+#   - jt (JAT Tasks: create, update, close, etc.)
+#   - /jat:* slash commands (via SlashCommand tool)
+#
+# Hook input (stdin): JSON with tool name, input, and output
+# Hook output (stdout): Message to display (triggers statusline refresh)
+
+# Read JSON input from stdin
+input_json=$(cat)
+
+# Extract the bash command that was executed
+command=$(echo "$input_json" | jq -r '.tool_input.command // empty')
+
+# Check if command is empty or null
+if [[ -z "$command" || "$command" == "null" ]]; then
+    exit 0
+fi
+
+# Detect agent coordination commands
+# Pattern: am-* (Agent Mail tools) or jt followed by space (JAT Tasks commands)
+if echo "$command" | grep -qE '^(am-|jt\s)'; then
+    # Extract the base command for display (first word)
+    base_cmd=$(echo "$command" | awk '{print $1}')
+
+    # Output a brief message - this triggers statusline refresh!
+    # Keep it minimal to avoid cluttering the conversation
+    echo "✓ $base_cmd executed"
+    exit 0
+fi
+
+# No agent coordination command detected - stay silent
+exit 0