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/teams-mcp.toml

@@ -0,0 +1,27 @@
+id = "teams-mcp"
+name = "Microsoft Teams"
+description = "Access Microsoft Teams channels, chats, and messages through the MCP server"
+category = "communication"
+icon = "👥"
+tags = ["chat", "messaging", "microsoft", "enterprise", "collaboration"]
+
+[transport]
+type = "stdio"
+command = "npx"
+args = ["-y", "teams-mcp"]
+
+[oauth]
+provider = "microsoft"
+scopes = ["Team.ReadBasic.All", "Chat.ReadWrite"]
+auth_url = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize"
+token_url = "https://login.microsoftonline.com/common/oauth2/v2.0/token"
+
+[health_check]
+interval_secs = 60
+unhealthy_threshold = 3
+
+setup_instructions = """
+1. Click 'Connect' to initiate the OAuth flow with your Microsoft account.
+2. Sign in with your Microsoft 365 account and grant LibreFang permission to read teams and read/write chats.
+3. The connection will be established automatically after authorization.
+"""