Publish derived snapshot atomicity proof

Non-production task 4.4 proof; production manifest unchanged.

proofs/v1/derived/README.md

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+# Derived snapshot publication proof
+
+This directory is a non-production task 4.4 fixture. It is excluded from the
+production tables, search index, and `manifests/v1/latest.json`.
+
+The candidate demonstrates one deterministic same-ID correction and one late
+backfill. `merge-report.json` identifies the affected issuer and year
+partitions; `test-report.json` records byte-stable no-change reuse plus rejected
+and successful atomic-pointer cases.

proofs/v1/derived/candidate/documents.ndjson

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+{"announcement_year":2026,"document_id":"ASX:AAA:00000001","exchange":"ASX","issuer_id":"ASX:AAA","source_document_id":"00000001","source_revision":"719a04994f244036f280d6c7f5ae815f34ef03d9faf637856dc04d3126447fd3","source_update_time":"2026-07-10T01:00:00Z","ticker":"AAA","title":"Unchanged"}
+{"announcement_year":2026,"document_id":"ASX:BBB:00000002","exchange":"ASX","issuer_id":"ASX:BBB","source_document_id":"00000002","source_revision":"719a04994f244036f280d6c7f5ae815f34ef03d9faf637856dc04d3126447fd3","source_update_time":"2026-07-17T01:00:00Z","ticker":"BBB","title":"Corrected"}
+{"announcement_year":2025,"document_id":"ASX:BBB:00000003","exchange":"ASX","issuer_id":"ASX:BBB","source_document_id":"00000003","source_revision":"719a04994f244036f280d6c7f5ae815f34ef03d9faf637856dc04d3126447fd3","source_update_time":"2025-06-01T01:00:00Z","ticker":"BBB","title":"Late backfill"}

proofs/v1/derived/candidate/merge-report.json

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+{
+  "actions": {
+    "new": 1,
+    "replaced": 1
+  },
+  "affected_document_partitions": [
+    2025,
+    2026
+  ],
+  "affected_issuers": [
+    "ASX:BBB"
+  ],
+  "mode": "incremental_merge",
+  "outputs": [
+    {
+      "bytes": 270,
+      "file": "companies.ndjson",
+      "rows": 2,
+      "sha256": "aaa771c2892aaeef4e1b6e3e97fff6828f9576b6656e992190f493b4bd450527"
+    },
+    {
+      "bytes": 889,
+      "file": "documents.ndjson",
+      "rows": 3,
+      "sha256": "c3b40ab80806123bc20664a245133c7b7cb9f0b59eae0c3c7b1a1f009ef71fa3"
+    },
+    {
+      "bytes": 0,
+      "file": "instruments.ndjson",
+      "rows": 0,
+      "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+    },
+    {
+      "bytes": 0,
+      "file": "events.ndjson",
+      "rows": 0,
+      "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+    }
+  ],
+  "plan_id": "e9950ebad0d2d5af06fd374a59d3af7a42052edee5c1ce0f3a68d0bb3e5cdcc3",
+  "search_rebuild_required": true,
+  "source_read_time": "2026-07-17T12:00:00Z",
+  "source_revision": "719a04994f244036f280d6c7f5ae815f34ef03d9faf637856dc04d3126447fd3",
+  "status": "valid",
+  "unaffected_rows_semantically_stable": 3
+}

proofs/v1/derived/test-report.json

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+{
+  "affected_issuers": [
+    "ASX:BBB"
+  ],
+  "candidate_documents_sha256": "c3b40ab80806123bc20664a245133c7b7cb9f0b59eae0c3c7b1a1f009ef71fa3",
+  "failed_gate_preserved_pointer": true,
+  "new": 1,
+  "replaced": 1,
+  "status": "pass",
+  "unaffected_no_change_byte_identical": 4,
+  "valid_gate_advanced_pointer": true
+}