[WIP] Add real CSV/OFX/QFX import adapters with provenance

[Copilot]

• Create packages/ingestion package with:
  • types.ts — ImportSession, RawTransaction, IngestionResult, RowError types
  • date-parser.ts — Multi-format date detection (MM/DD/YYYY, ISO, OFX YYYYMMDD, etc.)
  • csv-adapter.ts — Full CSV adapter with column mapping, date detection, per-row error tracking
  • ofx-adapter.ts — Full OFX/QFX adapter with SGML+XML support, per-row error tracking
  • storage.ts — IIngestionStore interface + InMemoryIngestionStore implementation
  • ingestion-service.ts — Main service: hash dedup → session → parse → store raw → report
  • index.ts — Package exports
  • package.json + tsconfig.json
• Update root package.json build:packages and test:unit scripts to include ingestion
• Update tsconfig.test.json with ingestion path alias
• Add unit tests in test/unit/ingestion.test.ts
• Verify build passes and tests pass

Original prompt

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This section details on the original issue you should resolve

<issue_title>feat(ingestion): real CSV/OFX/QFX import adapters with provenance</issue_title>
<issue_description>## Summary
Build packages/ingestion with real, end-to-end file import that persists everything. The current importers are parse-only shells — make them real adapters.

Owns

• CSV adapter: Configurable column mapping, date format detection, amount parsing
• OFX adapter: Parse OFX/QFX XML, extract transactions, account info
• File templates: Saved column mappings per institution/file type
• Row parsing: Error-tolerant parsing with per-row error tracking
• Raw transaction persistence: Store exactly what was imported, before any normalization
• Provenance: SHA-256 file hashes, import timestamps, source tracking
• Idempotent import: Re-importing same file is a no-op (hash dedup)

Import Flow

File → Hash check (dedup) → Create ImportSession → Parse rows →
Store raw transactions → Map to account → Generate postings → Report

Error Handling

• Parse errors don't abort the import — skip bad rows, report them
• Each ImportSession tracks: total rows, parsed rows, error rows, duplicate rows
• Errors are reviewable in the UI

Acceptance

• CSV import with configurable column mapping works end-to-end
• OFX/QFX parsing extracts transactions correctly
• File hash dedup prevents duplicate imports
• Import sessions are persisted with full provenance
• Parse errors are tracked per-row, not fatal</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes feat(ingestion): real CSV/OFX/QFX import adapters with provenance #51

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[kayodebristol]

Closing this PR to enforce the 1-PR-per-repo rule. Only one Copilot PR is allowed per repository at a time. The oldest PR (#48) will be kept active.