feat(storage): add the five missing Iceberg catalog capabilities

[spydon]

Problem

#74 splits the two bundled Iceberg entries into nine per-operation feature IDs: create, list and delete for namespaces; create, list, load, update, rename and delete for tables.

The Iceberg REST Catalog exposes five more operations that no feature ID describes:

Endpoint	Proposed ID
GET /namespaces/{ns}	storage.analytics.load_namespace_metadata
HEAD /namespaces/{ns}	storage.analytics.namespace_exists
POST /namespaces/{ns}/properties	storage.analytics.update_namespace_properties
POST /namespaces/{ns}/register	storage.analytics.register_table
HEAD /namespaces/{ns}/tables/{table}	storage.analytics.table_exists

This is not theoretical. supabase-flutter implements all five today:

IcebergRestCatalog.loadNamespaceMetadata
IcebergRestCatalog.namespaceExists
IcebergRestCatalog.updateNamespaceProperties
IcebergRestCatalog.registerTable
IcebergRestCatalog.tableExists

Because check-api-symbols requires every public symbol to be registered somewhere, and there is no ID that fits, those methods currently have to be declared against a capability they do not implement just to keep CI green. That is visible in supabase/supabase-flutter#1666, where the whole Iceberg symbol list is replicated across every split ID, and in supabase/supabase-flutter#1667, where they sit in a supporting bucket with a comment explaining they have no home.

Splitting a bundled capability into per-verb IDs is only lossless if the verbs cover the surface. These five are the gap.

Change

Adds the five feature IDs to capabilities/storage.yaml, in the existing analytics group, following the descriptions already used for the split entries.

No SDK currently declares anything under storage.analytics, so every SDK except Flutter is unaffected. They stay not_implemented by omission, which is accurate.

Test plan

• npm run validate: OK — capability matrix is valid.
• Confirmed against the Iceberg REST Catalog spec that all five are standard catalog endpoints rather than Flutter-specific conveniences.
• Confirmed supabase-js declares no storage.analytics capabilities, so nothing regresses there.

Related

• feat!: reconcile capability matrix inconsistencies from skill audit #74 introduces the split these five complete.
• feat(compliance): split symbol evidence from symbol coverage #75 separates symbol evidence from symbol coverage, which is the other half of why the Flutter Iceberg entries are currently awkward.
• chore: reconcile sdk-compliance.yaml with capability matrix renames and splits supabase-flutter#1667 consumes both and can attribute these five properly once this lands.

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Reviewing files that changed from the base of the PR and between 9c53a70 and 252190a.

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• capabilities/storage.yaml

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