Summary

• Added three AWS discovery rules for stopped EC2 instances, old manual RDS snapshots, and idle SageMaker endpoints.
• Extended AWS discovery hydration so EC2 instances expose parsed stop timestamps and SageMaker discovery can aggregate 14-day endpoint invocation totals from CloudWatch.
• Updated rule metadata, exports, tests, docs, and added published-package changesets for @cloudburn/sdk and @cloudburn/rules.

Diagram

flowchart LR
  RE["AWS Resource Explorer"] --> SDK["@cloudburn/sdk discovery loaders"]
  CW["CloudWatch metrics"] --> SDK
  SDK --> EC2["aws-ec2-instances\nstoppedAt"]
  SDK --> RDS["aws-rds-snapshots\nmanual snapshot age"]
  SDK --> SM["aws-sagemaker-endpoint-activity\n14d invocations"]
  EC2 --> Rules["@cloudburn/rules discovery evaluation"]
  RDS --> Rules
  SM --> Rules

Scope

• cloudburn (cli)
• @cloudburn/sdk
• @cloudburn/rules
• docs/community files

Release Notes

• Added a .changeset/*.md file for published package changes
• No published package changes in this PR

Verification

• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm build
• pnpm verify

Boundary Checks

• No engine/parser/provider logic added to @cloudburn/rules
• CLI delegates scan logic to SDK
• README/CONTRIBUTING/docs updated when behavior changed