feat(kiro): add core models and report parser - #9073

Summary

• add Kiro tool-layer models for connections, S3 slices/files, user reports, model-message counts, chat logs, and completion logs
• add the initial migration and table registration for those models
• normalize exported values and parse Kiro user-activity CSV reports, including dynamic model columns
• cover report variants and normalization edge cases with focused unit tests

Delivery sequence

This is the first of six sequential Kiro plugin changes. It intentionally contains no runtime plugin registration or AWS collection code; the next change adds S3 discovery, extraction, APIs, and plugin wiring after this foundation lands.

The separate commit-attribution helper is independent of this sequence.

Validation

• go test ./plugins/kiro/... -count=1
• go vet ./plugins/kiro/...

Signed-off-by: warren [email protected]