test(ingest): golden extraction case examples/ingest-golden-file, byte-frozen (I2)

examples/ingest-golden-file/expected-bundle/index.md

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+Golden extraction case: two CSV extracts from a local project archive (file source type).
+- [Project costs](ingest-costs.md)
+- [Escaping edge cases](ingest-edge.md)

examples/ingest-golden-file/expected-bundle/ingest-costs.md

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+---
+type: dataset
+title: Project costs
+source_system: prosjekt-arkiv
+source_query: costs.csv
+ingested_at: 2026-07-03T12:00:00Z
+ingest_manifest: manifest@24109f486b9ef708
+generated: true
+---
+
+| item | cost_nok | note |
+| --- | --- | --- |
+| led-retrofit | 120000 | ROI under 2 years |
+| hvac-tuning | 80000 | requires vendor quote |

examples/ingest-golden-file/expected-bundle/ingest-edge.md

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+---
+type: reference
+title: Escaping edge cases
+source_system: prosjekt-arkiv
+source_query: edge.csv
+ingested_at: 2026-07-03T12:00:00Z
+ingest_manifest: manifest@24109f486b9ef708
+generated: true
+---
+
+| id | value |
+| --- | --- |
+| backslash | a\\b |
+| pipe | a\|b |
+| newline | x y |
+| both | \\\| |
+| zeros | 007 |
+| decimal | 1.50 |