release(v4.0.1): strict-TS publishability fixes

4.0.0 shipped TypeScript source as published main/types, but several
files only compiled inside the monorepo. Consumer projects (Dispatch,
etc.) running their own strict tsc against our published source hit:

- @shade/key-transparency: 4 noUnusedLocals violations
  (IndexAbsenceProof, IndexInclusionProof, IndexProofWire, nodeHash)
- @shade/sdk: KT verifier callbacks returned Promise<unknown> instead
  of Promise<STHWire> / Promise<{ proof: string[] }>
- @shade/sdk: thumbnail.ts globalThis cast collided with consumer's
  lib.dom-supplied createImageBitmap signature
- @shade/files: cycle with @shade/sdk produced "this is not assignable
  to type 'Shade'" because hoisted node_modules layouts duplicated the
  Shade class. Broken by replacing `import type { Shade }` with a
  local structural ShadeBridge interface.
- @shade/storage-encrypted: KeyUsage (lib.dom) used under
  lib: ["ES2022"]
- @shade/transport-bridge: ReadableStreamDefaultReader<any> ↔
  <Uint8Array> mismatch
- @shade/keychain / @shade/dashboard / @shade/storage-encrypted
  tsconfig rootDir / include hygiene

Tooling: scripts/typecheck-all.ts runs `bunx tsc --noEmit` against
every workspace package's tsconfig and fails on any error. Wired into
publish:dry / publish:all and publish-shade.sh as a hard gate so this
class of bug cannot recur.

All 24 packages bumped to 4.0.1 in lockstep.

Migration: <ShadeFilesProvider> now requires an explicit `files` prop
(pass `shade.files`). Wire format unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shade-files/src/integration/shade-bridge.ts

@@ -0,0 +1,67 @@
+/**
+ * Structural surface @shade/files needs from a Shade instance.
+ *
+ * Defining this locally — instead of `import type { Shade } from '@shade/sdk'`
+ * — breaks the @shade/sdk ↔ @shade/files dependency cycle. Without this
+ * break, a consumer that installs @shade/sdk from a registry ends up with
+ * two distinct `Shade` classes in `node_modules` (one from
+ * `@shade/sdk/node_modules/@shade/files/.../Shade`, one from
+ * `@shade/sdk/Shade`). TypeScript treats them as nominally different types,
+ * raising `this is not assignable to Shade` from inside SDK methods that
+ * pass `this` into `createFilesNamespace`.
+ *
+ * The Shade class structurally implements every member listed below, so
+ * `createFilesNamespace(this)` from the SDK side compiles regardless of
+ * how many copies of @shade/sdk a consumer's package manager installs.
+ *
+ * Member signatures match Shade's exactly so this is a structural
+ * subtype, not a parallel API.
+ */
+import type { ShadeEnvelope } from '@shade/core';
+import type {
+  IncomingTransfer,
+  TransferHandle,
+  TransferOptions,
+} from '@shade/transfer';
+import type { ObservabilityHook } from '@shade/observability';
+
+export interface ShadeBridge {
+  /** Address that names this Shade instance to peers. */
+  readonly myAddress: string;
+
+  /** Encrypt + send `plaintext` to `peer`; returns the wire envelope. */
+  send(peer: string, plaintext: string): Promise<ShadeEnvelope>;
+
+  /**
+   * Subscribe to incoming ratchet plaintext. Returns an unsubscribe.
+   * Handlers may be sync or async; async handlers are awaited in
+   * registration order.
+   */
+  onMessage(
+    handler: (from: string, plaintext: string) => void | Promise<void>,
+  ): () => void;
+
+  /**
+   * Upload bytes via the SDK's transfer engine. Required when the bridge
+   * is used with `streams` content I/O (read/write > 256 KiB).
+   */
+  upload(opts: TransferOptions): Promise<TransferHandle>;
+
+  /** Subscribe to incoming transfers initiated by a peer. */
+  onIncomingTransfer(
+    handler: (incoming: IncomingTransfer) => void | Promise<void>,
+  ): Promise<() => void>;
+
+  /** Fingerprint accessor for the trust-gate hooks. */
+  getFingerprintFor(peer: string): Promise<string>;
+
+  /**
+   * Optional inheritable observability bus. Files inherits the bus when
+   * the SDK passes one in via the namespace; otherwise files runs without
+   * observability hooks.
+   */
+  getObservability?(): ObservabilityHook | undefined;
+
+  /** Optional control-envelope passthrough used by the WebRTC bridge. */
+  deliverControlEnvelope?(peer: string, envelope: ShadeEnvelope): Promise<void>;
+}