Move report row parsing into adapters

[asizikov]

Summary

Adapter-owned parsing lets runPipeline use the report adapter selected during preflight for row parsing, keeping format validation and row normalization on the same adapter boundary. This preserves transition-period billing preview behavior while keeping native AI Credits uploads unsupported until native UI mode is ready.

Changes

Commit	Change
refactor: move report row parsing into adapters	Extends UsageReportAdapter with parseRecord, routes transition-period parsing through existing normalization/backfill behavior, exposes a native parse hook, and keeps native validation throwing before production processing reaches aggregators.

• Return the selected adapter from file-format validation so the processing pass does not re-detect report format from rows.
• Use reportAdapter.parseRecord(...) in runPipeline instead of directly calling transition-period parsing.
• Add adapter tests covering transition-period normalization/backfill and the native unsupported boundary.

Testing

• npm test -- --run src/pipeline/reportAdapters.test.ts src/pipeline/runPipeline.test.ts src/pipeline/parser.test.ts
• npm test
• npm run lint
• npm run build

Checklist

• Specs lint passes (npm run lint)
• Tests updated if applicable
• Documentation updated if applicable

[Copilot]

Pull request overview

This PR refactors usage-report row parsing so it is owned by the selected UsageReportAdapter, allowing runPipeline to use the adapter chosen during preflight/format validation for consistent row normalization and unsupported-format handling.

Changes:

• Extend UsageReportAdapter with parseRecord(...) and implement adapter-specific parsing for transition-period vs native AI Credits.
• Update runPipeline to reuse the adapter returned from file-format validation and call reportAdapter.parseRecord(...) for row parsing.
• Add/adjust adapter tests to cover transition-period normalization/backfill behavior and the native unsupported boundary (including date normalization via the native parse hook).

Show a summary per file

File	Description
src/pipeline/runPipeline.ts	Returns the selected adapter from format validation and uses adapter-owned parseRecord during processing.
src/pipeline/reportAdapters.ts	Adds parseRecord to the adapter interface and wires parsing implementations for each adapter.
src/pipeline/reportAdapters.test.ts	Adds tests asserting adapter parsing behavior for transition-period normalization and native AI Credits unsupported handling.

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• Files reviewed: 3/3 changed files
• Comments generated: 0