feat(lite): lite wallet foundation (inherited working-tree state)

Preserve the previously-uncommitted lite wallet implementation and related dev WIP
under version control:
- src/wallet/ lite services: client bridge, bridge runtime, connection, lifecycle,
  sync, gateway, result parsers, state mapper, artifact contract/resolver, refresh
  services, UI adapters, wallet_backend/capabilities. (Includes two small M1 fixes:
  lifecycle walletReady now parses the response; default chain name -> "main".)
- src/chat/ chat protocol; tests/fixtures/ (lite + hushchat); tools/hushchat_fixture_check.cpp;
  scripts/build-lite-backend-artifact.sh.
- Pre-existing modified app_network/security/wizard, network_refresh_service, sidebar,
  mining_tab, bootstrap dialog, and version headers captured as-is.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/fixtures/hushchat/corrupted-auth-failure.pending.json

@@ -0,0 +1,7 @@
+{
+  "schema": "dragonx.hushchat.compat-fixture.v1",
+  "status": "pending",
+  "kind": "corrupted_auth_failure",
+  "id": "sdxl-corrupted-auth-failure",
+  "pending_reason": "Needs a non-sensitive Memo vector that passes structural Batch 1-6 validation but is expected to fail future secretstream authentication."
+}