feat(examples): ship the §11 golden fixtures with byte-exact conformance

TDD step 8: three golden cases per the §11 format (manifest.json,
fixture/, ingested-at.txt, expected-bundle/) — ingest-golden-file and
ingest-golden-sql are the conformance MUSTs; ingest-golden-http
documents and exercises the optional extension against mock payloads.
The conformance test re-materializes each case into a fresh directory
and compares byte for byte; offline and credential-free (the sql
fixture is a committed database file, http never opens a socket).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QeqhJpYQyghASjiJo5EhGg

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

@@ -0,0 +1,3 @@
+Golden file-source bundle: orders and products extracted from a CSV catalogue.
+- [Orders](ingest-orders.md)
+- [Products](ingest-products.md)

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

@@ -0,0 +1,15 @@
+---
+type: dataset
+title: Orders
+source_system: golden-catalogue
+source_query: orders.csv
+ingested_at: 2026-07-16T12:00:00Z
+ingest_manifest: manifest@37674ac20059e788
+generated: true
+---
+
+| order_id | customer | total |
+| --- | --- | --- |
+| 1001 | Alice | 250.5 |
+| 1002 | Bob | 99.9 |
+| 1003 | Carol | 0.1 |

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

@@ -0,0 +1,15 @@
+---
+type: dataset
+title: Products
+source_system: golden-catalogue
+source_query: products.csv
+ingested_at: 2026-07-16T12:00:00Z
+ingest_manifest: manifest@37674ac20059e788
+generated: true
+---
+
+| sku | name | note |
+| --- | --- | --- |
+| A-1 | Pipe\|Product | has\|pipe |
+| B-2 | Back\\slash | line1 line2 |
+| C-3 | Plain |  |

examples/ingest-golden-file/fixture/orders.csv

@@ -0,0 +1,4 @@
+order_id,customer,total
+1001,Alice,250.5
+1002,Bob,99.9
+1003,Carol,0.1

examples/ingest-golden-file/fixture/products.csv

@@ -0,0 +1,5 @@
+sku,name,note
+A-1,Pipe|Product,has|pipe
+B-2,Back\slash,"line1
+line2"
+C-3,Plain,

examples/ingest-golden-file/ingested-at.txt

@@ -0,0 +1 @@
+2026-07-16T12:00:00Z

examples/ingest-golden-file/manifest.json

@@ -0,0 +1,25 @@
+{
+  "manifest_version": 1,
+  "source": {
+    "type": "file",
+    "id": "golden-catalogue",
+    "root": "fixture"
+  },
+  "bundle_summary": "Golden file-source bundle: orders and products extracted from a CSV catalogue.",
+  "extractions": [
+    {
+      "id": "orders",
+      "title": "Orders",
+      "query": "orders.csv",
+      "okf_type": "dataset",
+      "max_rows": 10
+    },
+    {
+      "id": "products",
+      "title": "Products",
+      "query": "products.csv",
+      "okf_type": "dataset",
+      "max_rows": 10
+    }
+  ]
+}