feat: sync content definitions from core repo

Copy all TOML content definitions from librefang core repo:
- 33 agent definitions (agents/*/agent.toml)
- 14 hand definitions with docs (hands/*/HAND.toml + SKILL.md)
- 25 integration templates (integrations/*.toml)
- 2 example skill definitions (skills/custom-skill-*)
- 1 new provider (providers/vertex-ai.toml)

Part of the framework-vs-content registry split (RFC v0.7).

integrations/sqlite-mcp.toml

@@ -0,0 +1,28 @@
+id = "sqlite-mcp"
+name = "SQLite"
+description = "Query and manage local SQLite databases through the MCP server"
+category = "data"
+icon = "💾"
+tags = ["database", "sql", "relational", "sqlite", "local", "embedded"]
+
+[transport]
+type = "stdio"
+command = "npx"
+args = ["-y", "@modelcontextprotocol/server-sqlite"]
+
+[[required_env]]
+name = "SQLITE_DB_PATH"
+label = "SQLite Database Path"
+help = "Absolute path to the SQLite database file (e.g., /home/user/data/mydb.sqlite)"
+is_secret = false
+get_url = ""
+
+[health_check]
+interval_secs = 60
+unhealthy_threshold = 3
+
+setup_instructions = """
+1. Locate the SQLite database file you want to connect to on your local filesystem.
+2. Enter the absolute path to the database file in the SQLITE_DB_PATH field above.
+3. Ensure the file has appropriate read/write permissions for the LibreFang process.
+"""