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/aws.toml

@@ -0,0 +1,42 @@
+id = "aws"
+name = "AWS"
+description = "Manage Amazon Web Services resources including S3, EC2, Lambda, and more through the MCP server"
+category = "cloud"
+icon = "☁️"
+tags = ["cloud", "amazon", "infrastructure", "s3", "ec2", "lambda", "devops"]
+
+[transport]
+type = "stdio"
+command = "npx"
+args = ["-y", "@aws-mcp/server-aws"]
+
+[[required_env]]
+name = "AWS_ACCESS_KEY_ID"
+label = "AWS Access Key ID"
+help = "The access key ID from your AWS IAM credentials"
+is_secret = true
+get_url = "https://console.aws.amazon.com/iam/home#/security_credentials"
+
+[[required_env]]
+name = "AWS_SECRET_ACCESS_KEY"
+label = "AWS Secret Access Key"
+help = "The secret access key paired with your access key ID"
+is_secret = true
+get_url = "https://console.aws.amazon.com/iam/home#/security_credentials"
+
+[[required_env]]
+name = "AWS_REGION"
+label = "AWS Region"
+help = "The default AWS region to use (e.g., us-east-1, eu-west-1)"
+is_secret = false
+get_url = ""
+
+[health_check]
+interval_secs = 60
+unhealthy_threshold = 3
+
+setup_instructions = """
+1. Go to the AWS IAM Console (https://console.aws.amazon.com/iam/) and create or select an IAM user with programmatic access.
+2. Generate an access key pair and note down the Access Key ID and Secret Access Key.
+3. Paste both credentials and your preferred AWS region (default: us-east-1) into the fields above.
+"""