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>

examples/control-cycle/apps-pg-actual.json

@@ -1 +0,0 @@
-{"schema_version":"0.1","record_id":"actual:apps-pg:2026-09","record_type":"actual","resource_id":"resource:railiance:apps-pg","resource_class":"shared_platform_service","period":"2026-09","created_at":"2026-10-02T00:00:00Z","scenario":"observed","forecast_ref":"forecast:apps-pg:2026-09:base:v1","revision_of":null,"usage_proxies":{"database_gb":{"value":6,"unit":"GB"},"connections":{"value":18,"unit":"peak"}},"capacity":{"model":"hybrid","provisioned":{"storage":{"value":20,"unit":"GiB"}},"used":{"storage":{"value":6,"unit":"GB"}}},"costs":{"currency":"EUR","infrastructure":15,"internal_labor":90,"external_labor":0,"total":105,"booked_cost_refs":["financial-fact:example-shared-allocation-2026-09"]},"allocation":{"method":"proportional","driver":"database_gb","method_version":"1","unattributed_eur":5},"service_constraints":{"rpo_minutes":{"value":5,"unit":"minutes"},"rto_minutes":{"value":60,"unit":"minutes"}},"variance_attribution":{"database_gb":"demand","connections":"model","costs.internal_labor":"labor"},"evidence":["illustrative actual; replace with RAILIANCE-WP-0016 evidence"]}

examples/control-cycle/apps-pg-forecast.json

@@ -1 +0,0 @@
-{"schema_version":"0.1","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":"2026-08-11T00:00:00Z","scenario":"base","forecast_ref":null,"revision_of":null,"usage_proxies":{"database_gb":{"value":5,"unit":"GB"},"connections":{"value":20,"unit":"peak"}},"capacity":{"model":"hybrid","provisioned":{"storage":{"value":20,"unit":"GiB"}},"used":{"storage":{"value":5,"unit":"GB"}}},"costs":{"currency":"EUR","infrastructure":15,"internal_labor":60,"external_labor":0,"total":75,"booked_cost_refs":[]},"allocation":{"method":"proportional","driver":"database_gb","method_version":"1","unattributed_eur":5},"service_constraints":{"rpo_minutes":{"value":5,"unit":"minutes"},"rto_minutes":{"value":60,"unit":"minutes"}},"uncertainty":{"level":"high","notes":["Illustrative until platform evidence arrives"]},"evidence":["RAILIANCE-WP-0016"]}