feat(peer)!: cut over to authenticated catalog sharing

Replace address-only trust and pushed peer state with installation identities,
SPKI-pinned QUIC, candidate-only discovery, and bounded responder-owned
protocol-8 pulls. The runtime now owns each network generation and all admitted
work through shutdown.

Add exact bundled content identities, reproducible manifest publishing,
capability-confined downloads, streaming BLAKE3 verification, quarantine and
retry, and crash-recoverable download and install transactions. Ship generated
fixture catalogs and fail closed when production manifests are absent.

The Tauri backend exposes durable sharing policy, redacted identity state, and
attempt-keyed transfer snapshots. Frontend consumption follows in the next
commit. Repository-wide test certificates and protocol-7 paths are removed.

BREAKING CHANGE: peers must use protocol 8 and exact catalog content artifacts;
protocol-7 frames and shared-certificate identities are no longer accepted.

Test Plan:
- `just test` -- passed on the completed stack (708 workspace tests)
- `just clippy` -- passed on the completed stack
- `just build` -- passed with fixture catalogs on the completed stack
- `just catalog-check-production` -- failed closed because the external
  production manifest corpus is absent
- `git diff --cached --check` -- passed

crates/lanspread-peer-cli/catalogs/default/manifests/ggoo.json

@@ -0,0 +1,53 @@
+{
+  "schema_version": 1,
+  "game_id": "ggoo",
+  "game_version": "20200721",
+  "chunk_size": 134217728,
+  "files": [
+    {
+      "canonical_path": "ggoo.eti",
+      "kind": "file",
+      "size": 3146110,
+      "file_blake3": "ca521fcb90514c2d4c6d33fe79d1252066547f5f83f5a98bf92d93e473fbebe4",
+      "chunk_blake3": [
+        "ca521fcb90514c2d4c6d33fe79d1252066547f5f83f5a98bf92d93e473fbebe4"
+      ]
+    },
+    {
+      "canonical_path": "version.ini",
+      "kind": "file",
+      "size": 8,
+      "file_blake3": "a5354e30ec514c1a2b1d7db06e88345a861b5cd90dc7f287a44c917612f851aa",
+      "chunk_blake3": [
+        "a5354e30ec514c1a2b1d7db06e88345a861b5cd90dc7f287a44c917612f851aa"
+      ]
+    }
+  ],
+  "streamed_install_files": [
+    {
+      "canonical_path": "bin",
+      "kind": "directory",
+      "size": 0,
+      "file_blake3": null
+    },
+    {
+      "canonical_path": "bin/ggoo-payload.bin",
+      "kind": "file",
+      "size": 2097152,
+      "file_blake3": "0c793d5caa4d76d70ae2251950b74c89fe8d795d9467f8d00a115b254a5483ad"
+    },
+    {
+      "canonical_path": "data",
+      "kind": "directory",
+      "size": 0,
+      "file_blake3": null
+    },
+    {
+      "canonical_path": "data/ggoo-assets.dat",
+      "kind": "file",
+      "size": 1048576,
+      "file_blake3": "e0177aff792b3796037edddd40e4cf834448f638f24225fc891c645619004b35"
+    }
+  ],
+  "content_id": "30a6358eff3b0ed6d797aee10766ca69741eb1198f83d341d0876b5ce1009ae0"
+}