feat(ingest): I5 — SQL D7-speil, bygget fra commons-spec alene

Speiler MAF I4 fra shared/ingest-spec.md alene: manifest → SQL-konnektor →
materialisert OKF-bundle, byte-identisk med den delte golden-fasiten. Gaten
I4→I5 verifisert løst mot ground truth (MAF-commits d7e5f2f/4f45fe6/1b7612b)
før arbeidet startet. Spec byte-identisk delt, ingen spec-endring (I4).

- ingest.py: SqlSource (type: sql, id, connection_ref); ManifestContract.source
  er nå diskriminert union FileSource | SqlSource på type (http/ukjent tag →
  fail-fast). _render_sql_cell (§5 typed: NULL→"", int→decimal, float→korteste
  round-trip, str→verbatim m/ delt _escape_cell, annet→fail — aldri stille
  coercion). _resolve_connection_ref (env-oppslag §4/§8, usatt → fail-fast).
  _read_sql (read-only sqlite file:?mode=ro, ett SELECT, max_rows §8).
  _read_extraction dispatcher på source.type; materialisering/index/replacement
  uendret fra I3.
- examples/ingest-golden-sql/: repo-lokal golden (byte-frossen kopi av I4s fasit).
- Speiltester (I4s load-bearing-sett, gjennom SQL-konnektoren, detach-bevist røde):
  sql-golden byte-fasit + mutasjonskontroller · typed-cell/NULL (NY §I5-søm) ·
  provenance/navigability/verdict-reservasjon/re-ingest-safety · SqlSource-kontrakt/
  typed-rendering/connection_ref/max_rows/read-only · spec-integritet utvidet med
  connection_ref. Stale type:"sql"-avvisningscase erstattet (sql er gyldig post-I5).
- docs/2026-07-04-I5-brief.md: brief + premiss-verifisering.

Suite 265 passed uten nøkkel/nettverk (239 + 26 nye) · ruff + mypy --strict rene.

[skip-docs] README + docs/extending.md er bevisst utsatt til I7 per sesjonsplan
(programmet batcher ingest-doc der, avgrenset til det D7 faktisk har — CSV + SQL nå,
HTTP/MCP kun pekere). Dokumentert i docs/2026-07-04-I5-brief.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017MM6BWb1hWmJZuXFZ7rjxT

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

@@ -0,0 +1,3 @@
+Golden extraction case: two SQL extracts from a local project database (sql source type).
+- [Project costs](ingest-costs.md)
+- [Catalogue metadata](ingest-meta.md)

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

@@ -0,0 +1,15 @@
+---
+type: dataset
+title: Project costs
+source_system: portefolje-db
+source_query: SELECT id, item, amount, note FROM costs ORDER BY id
+ingested_at: 2026-07-04T12:00:00Z
+ingest_manifest: manifest@a4b891aea55df97b
+generated: true
+---
+
+| id | item | amount | note |
+| --- | --- | --- | --- |
+| 1 | LED-armatur | 1200.5 | godkjent |
+| 2 | sensor | 89.9 |  |
+| 3 | kabel | 4200.0 | rest |

examples/ingest-golden-sql/expected-bundle/ingest-meta.md

@@ -0,0 +1,14 @@
+---
+type: reference
+title: Catalogue metadata
+source_system: portefolje-db
+source_query: SELECT k, v FROM meta ORDER BY k
+ingested_at: 2026-07-04T12:00:00Z
+ingest_manifest: manifest@a4b891aea55df97b
+generated: true
+---
+
+| k | v |
+| --- | --- |
+| owner | anlegg \| drift |
+| path | c:\\temp |