feat: add host-provided module object storage

`manifest.storage.buckets` has existed since manifest version 1 and meant
nothing — discovery validated it and no code read it. This turns it into a
real capability, which is what stands between Announcements and the module
system: that product currently fetches a hardcoded LAN S3 endpoint, parses
ListObjectsV2 XML by hand, and hands the browser direct object URLs.

- A module declares a logical bucket and receives a scoped facade at
  `context.storage` — list, head, get, put, delete. The contract names no
  provider: no endpoint, region, credential, or physical bucket is reachable
  from it, which is what lets the same module run under a future standalone
  host over its own or a shared S3-compatible service.
- Core's first provider speaks S3 through the AWS SDK. SeaweedFS is the
  deployment target (ADR 0004), never an API name. Probing the pinned image
  found `CreateBucket` reporting `BucketAlreadyExists` rather than AWS's
  `BucketAlreadyOwnedByYou`; treating only the AWS spelling as success would
  have failed every second boot. A live test pins it.
- Logical → physical mapping is deterministic and collision-safe: an
  installation prefix, the module and bucket ids joined by `--` (which cannot
  occur inside either identifier, so `a-b`+`c` and `a`+`b-c` cannot collide),
  and a digest over the full untruncated identity. Two modules declaring
  `assets` always get separate namespaces; neither can see the physical name.
- Declaring a bucket is now a requirement: with no provider configured the
  module is `blocked · storage_unavailable` through ADR 0028's existing
  resolver, propagating to required dependents. An installation with no object
  storage stays a complete deployment.
- Binding availability is not provider health. Eligibility asks whether
  storage is configured, never whether it answered; bucket creation is lazy on
  first use so a storage outage cannot stop the platform booting; a running
  module whose store blinks stays running and retries. Nothing deletes a
  bucket.
- Credentials are deployment-supplied, never persisted, never routed through
  module configuration, and never visible to modules, module UI, diagnostics,
  or API responses. Provider errors translate to a closed code set carrying no
  endpoint, bucket, request id, or XML.
- Retires ADR 0029's transitional `bucket` configuration key. No manifest
  version change. The template declares no bucket, so it still runs without S3.

See ADR 0030.

Co-Authored-By: Claude Opus 5 <[email protected]>

apps/api/tests/app.test.ts

@@ -22,6 +22,7 @@ import { createApiApp, type CreateApiAppAuthorizationOptions } from "../src/app.
 import { AUTH_REQUEST_MAX_BODY_BYTES } from "../src/body-limits.js";
 import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
 import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
+import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
 
 const trustedOrigin = "https://dashboard.example.test";
 const untrustedOrigin = "https://evil.example.test";
@@ -92,6 +93,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -113,6 +115,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -135,6 +138,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -159,6 +163,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -185,6 +190,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -211,6 +217,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -234,6 +241,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -259,6 +267,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -281,6 +290,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
@@ -305,6 +315,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
@@ -336,6 +347,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
@@ -368,6 +380,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),
@@ -405,6 +418,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -424,6 +438,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -445,6 +460,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -465,6 +481,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -483,6 +500,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -508,6 +526,7 @@ describe("Ekklesia API Hono application", () => {
       moduleUi: emptyModuleUiPublication(),
       moduleLifecycle: emptyModuleLifecycle(),
       moduleConfiguration: emptyModuleConfiguration(),
+      moduleStorage: emptyModuleStorage(),
       dashboard: createInMemoryDashboardStore(),
       moduleServices: fakeModuleServices(),
       authorization: fakeAuthorization({}),
@@ -536,6 +555,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({ evaluator: { authorize: evaluatorAuthorize } }),
@@ -567,6 +587,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({
@@ -589,6 +610,7 @@ describe("Ekklesia API Hono application", () => {
         moduleUi: emptyModuleUiPublication(),
         moduleLifecycle: emptyModuleLifecycle(),
         moduleConfiguration: emptyModuleConfiguration(),
+        moduleStorage: emptyModuleStorage(),
         dashboard: createInMemoryDashboardStore(),
         moduleServices: fakeModuleServices(),
         authorization: fakeAuthorization({}),