feat(portfolio): fold in RAILIANCE-WP-0016 apps-pg evidence

First delegated evidence from RESOURCE-WP-0003-T04 to land. railiance-platform
delivered apps-pg capacity, utilization, consumers, and the apps-pg-dbbytes-v1
allocation driver, and correctly delivered no EUR.

- data/resources/apps-pg.json: real capacity; allocation unattributed -> shared
  under apps-pg-dbbytes-v1; second consumer vergabe-teilnahme registered
- data/control-cycle/apps-pg-2026-09-base.json: first operational control-cycle
  record in the repository
- examples/control-cycle/apps-pg-*.json retired; the invented fixture collided
  with the real record's identifier
- data/portfolio-coverage-2026-08-14.json: gap marked delivered with three
  residual unknowns still open

The real evidence exposed a design gap in the T05 schema: v0.1 required a number
for every cost field, so recording genuine usage without a booked cost meant
inventing one. Schema 0.2 permits null costs, null unattributed_eur, a technical
unattributed_share, and null measurements. Null is unknown, never zero; an
unknown component makes the total null rather than the sum of the known parts;
and the comparator classifies unknown amounts as data_quality instead of
computing a variance. Existing 0.1 records are not rewritten.

apps-pg is now measured (idle at 5.8% of volume) and attributed, and remains
unpriced: delivered technical evidence does not create a booked cost.

86 tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

data/control-cycle/apps-pg-2026-09-base.json

@@ -0,0 +1,69 @@
+{
+  "schema_version": "0.2",
+  "record_id": "forecast:apps-pg:2026-09:base:v1",
+  "record_type": "forecast",
+  "resource_id": "resource:railiance:apps-pg",
+  "resource_class": "shared_platform_service",
+  "period": "2026-09",
+  "created_at": "2026-08-14T00:00:00Z",
+  "scenario": "base",
+  "forecast_ref": null,
+  "revision_of": null,
+  "usage_proxies": {
+    "consumer_database_gb": { "value": 0.0155, "unit": "GiB" },
+    "pgdata_gb": { "value": 0.5766, "unit": "GiB" },
+    "wal_gb": { "value": 0.5469, "unit": "GiB" },
+    "sessions": { "value": 7, "unit": "count" }
+  },
+  "capacity": {
+    "model": "hybrid",
+    "provisioned": {
+      "storage": { "value": 10, "unit": "GiB" },
+      "instances": { "value": 1, "unit": "count" },
+      "max_connections": { "value": 100, "unit": "count" }
+    },
+    "used": {
+      "storage": { "value": 0.5766, "unit": "GiB" },
+      "instances": { "value": 1, "unit": "count" },
+      "sessions": { "value": 7, "unit": "count" }
+    }
+  },
+  "costs": {
+    "currency": "EUR",
+    "infrastructure": null,
+    "internal_labor": 30.0,
+    "external_labor": 0,
+    "total": null,
+    "booked_cost_refs": []
+  },
+  "allocation": {
+    "method": "proportional",
+    "driver": "database_gb",
+    "method_version": "apps-pg-dbbytes-v1",
+    "unattributed_eur": null,
+    "unattributed_share": 0.948
+  },
+  "service_constraints": {
+    "rpo_minutes": { "value": null, "unit": "minutes" },
+    "rto_minutes": { "value": null, "unit": "minutes" }
+  },
+  "uncertainty": {
+    "level": "high",
+    "notes": [
+      "First operational control-cycle record for this resource, from railiance-platform RAILIANCE-WP-0016 captured 2026-08-14T00:04:19Z",
+      "Infrastructure cost is null: apps-pg is a share of resource:hosteurope:railiance01, whose booked price is unknown (RAIL-HO-WP-0008)",
+      "Internal labour is 0.5 declared operator-hours per month converted at the EUR 60 per hour rate used in data/demand/platform-audit-storage.json; the hours are an estimate, not a timesheet",
+      "Total is null because one component is unknown; it is not the sum of the known parts",
+      "94.8 percent of used volume is WAL and engine catalogs attributed to platform:apps-pg-overhead, not to a consumer",
+      "vergabe_db has never recorded a transaction, so its 0.4614 byte share reflects a reserved empty database rather than realised demand",
+      "Five days of cluster life and no metrics retention: this is a snapshot carried forward, not a trend",
+      "RPO is unbounded and RTO undefined — no ScheduledBackup exists and the cluster is not an Option A logical-dump target"
+    ]
+  },
+  "evidence": [
+    "/home/worsch/railiance-platform/docs/evidence/RAILIANCE-WP-0016-apps-pg-observation.json",
+    "/home/worsch/railiance-platform/docs/evidence/RAILIANCE-WP-0016-apps-pg-resource-evidence.md",
+    "RAILIANCE-WP-0016",
+    "data/resources/apps-pg.json"
+  ]
+}