feat(cli): add interactive progress bar

[axonstone]

Summary

• Added a simple CLI-owned ASCII progress bar for interactive cloudburn scan and cloudburn discover runs.
• Kept progress output on stderr only when attached to a TTY so JSON and table output on stdout remain unchanged for redirects and automation.
• Added CLI coverage for interactive progress rendering, non-TTY suppression, and progress cleanup before runtime errors.
• Added a patch changeset for the published cloudburn package and updated the CLI architecture docs to document the new behavior.

Diagram

flowchart LR
  A[scan or discover command] --> B[ASCII progress tracker]
  B --> C[stderr TTY updates]
  A --> D[CloudBurn SDK execution]
  D --> E[formatted result]
  E --> F[stdout table or json]

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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