feat: add AWS discovery cost activity checks

[axonstone]

Summary

• Added eight AWS discovery cost rules across Lambda, CloudWatch Logs, DynamoDB, Cost Guardrails, ELB, CloudFront, and ElastiCache.
• Added the supporting SDK discovery datasets and hydrators for metric-backed activity checks and account-level cost guardrail summaries.
• This expands live discovery coverage for practical AWS cost optimization findings that were not previously modeled.

Diagram

flowchart LR
  Catalog["Resource Explorer catalog"] --> Datasets["SDK discovery datasets
config + CloudWatch + account summaries"]
  Datasets --> Rules["AWS discovery rules"]
  Rules --> Findings["Cost optimization findings"]

  Lambda["Lambda memory + duration"] --> Rules
  Logs["Log storage + metric filters"] --> Rules
  DynamoDB["Provisioned table utilization"] --> Rules
  Guardrails["Budgets + anomaly monitors"] --> Rules
  ELB["Load balancer request activity"] --> Rules
  CloudFront["Distribution request activity"] --> Rules
  ElastiCache["Cache hit rate + connections"] --> Rules

Loading

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

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[devin-ai-integration]

Devin Review found 1 potential issue.

View 4 additional findings in Devin Review.