fix(session): remember where aliasSession moved a session

aliasSession knew that two labels name the same peer, then threw that
knowledge away. The binding lived only in the caller's memory, so a
restart lost it — and the peer could not repair it from its side.

First contact forces the receiver to label a session by the only sender
hint a relay surfaces, an 8-byte signing-key fingerprint (`fp:<hex>`).
Once the peer announces its canonical address, aliasSession moves the
session there. But the peer keeps sending under `fp:<hex>`, because its
transport derives the same label from the same hint every time. After a
restart the session sat under the canonical address, inbound frames
resolved to `fp:<hex>`, and nothing matched. The peer held a valid
session so it never re-ran X3DH: the failure was permanent, and only a
manual re-link cleared it.

Observed in Prism as `No session for address: fp:579c3b335d66e2c0` on
every receive for three days, with a phone whose every RPC timed out.

StorageProvider gains saveSessionAlias / getSessionAlias /
removeSessionAliasesFor, optional so third-party implementations keep
compiling, and implemented across all seven backends. Lookups resolve
through resolveLabel(), which runs BEFORE the peer mutex — locking the
alias while mutating the canonical session would let an aliased and a
canonical caller ratchet the same state concurrently.

A live session under a label always wins over an alias, and prekey
envelopes never resolve: both keep a re-link establishing a fresh
session instead of being redirected into the stale one. Aliases are
dropped in resetSession and acceptIdentityChange, and memoized so the
hot path costs no extra read.

The sdk.test.ts case that asserted a dead fp-label encoded the old
behaviour; it now pins the new contract.

Verified: 1166 tests pass (from 1160). With alias persistence disabled
as a negative control, 5 of the 6 new tests fail, including both
restart cases.

Also drops `baseUrl` from the consumer-strict tsconfig — removed in
TS 6.0, and it was failing the typecheck that gates publishing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

packages/shade-storage-sqlite/src/sqlite-storage.ts

@@ -41,6 +41,9 @@ export class SQLiteStorage implements StorageProvider {
     getSession: ReturnType<Database['prepare']>;
     saveSession: ReturnType<Database['prepare']>;
     removeSession: ReturnType<Database['prepare']>;
+    getSessionAlias: ReturnType<Database['prepare']>;
+    saveSessionAlias: ReturnType<Database['prepare']>;
+    removeAliasesFor: ReturnType<Database['prepare']>;
     getTrust: ReturnType<Database['prepare']>;
     saveTrust: ReturnType<Database['prepare']>;
     addRetired: ReturnType<Database['prepare']>;
@@ -100,6 +103,12 @@ export class SQLiteStorage implements StorageProvider {
         address TEXT PRIMARY KEY,
         state_json TEXT NOT NULL
       );
+      CREATE TABLE IF NOT EXISTS session_aliases (
+        alias     TEXT PRIMARY KEY,
+        canonical TEXT NOT NULL
+      );
+      CREATE INDEX IF NOT EXISTS idx_session_aliases_canonical
+        ON session_aliases(canonical);
       CREATE TABLE IF NOT EXISTS trusted_identities (
         address TEXT PRIMARY KEY,
         identity_key TEXT NOT NULL
@@ -179,6 +188,9 @@ export class SQLiteStorage implements StorageProvider {
       getSession: this.db.prepare('SELECT state_json FROM sessions WHERE address = ?'),
       saveSession: this.db.prepare('INSERT OR REPLACE INTO sessions (address, state_json) VALUES (?, ?)'),
       removeSession: this.db.prepare('DELETE FROM sessions WHERE address = ?'),
+      getSessionAlias: this.db.prepare('SELECT canonical FROM session_aliases WHERE alias = ?'),
+      saveSessionAlias: this.db.prepare('INSERT OR REPLACE INTO session_aliases (alias, canonical) VALUES (?, ?)'),
+      removeAliasesFor: this.db.prepare('DELETE FROM session_aliases WHERE canonical = ?'),
       getTrust: this.db.prepare('SELECT identity_key FROM trusted_identities WHERE address = ?'),
       saveTrust: this.db.prepare('INSERT OR REPLACE INTO trusted_identities (address, identity_key) VALUES (?, ?)'),
       addRetired: this.db.prepare('INSERT INTO retired_identities (data_json, retired_at) VALUES (?, ?)'),
@@ -337,6 +349,21 @@ export class SQLiteStorage implements StorageProvider {
     this.stmts.removeSession.run(address);
   }
 
+  // ─── Session label aliases ────────────────────────────────
+
+  async getSessionAlias(alias: string): Promise<string | null> {
+    const row = this.stmts.getSessionAlias.get(alias) as { canonical: string } | undefined;
+    return row?.canonical ?? null;
+  }
+
+  async saveSessionAlias(alias: string, canonical: string): Promise<void> {
+    this.stmts.saveSessionAlias.run(alias, canonical);
+  }
+
+  async removeSessionAliasesFor(canonical: string): Promise<void> {
+    this.stmts.removeAliasesFor.run(canonical);
+  }
+
   // ─── Trust ────────────────────────────────────────────────
 
   async isTrustedIdentity(address: string, identityKey: Uint8Array): Promise<boolean> {