test(client): real-broker e2e harness for the SDK (own domain, dedicated wallet)

The polyfill had only fake-ng unit tests; real-broker behaviour (SPARQL graph
round-trip, doc_subscribe marshaling, inbox/index) was only ever exercised by
borrowing Festipod's harness. Add packages/client/e2e/ — a standalone Playwright
harness in the SDK's own domain: a minimal SDK page (configure() + the real
@ng-org/web ng, a window.__sdk bridge, zero Festipod domain) loaded in the broker
iframe on the real broker, authenticating with a DEDICATED wallet (name
ng-eventually-e2e, profile e2e/.playwright-profile-lib — gitignored, separate from
Festipod's). Runner: bun run e2e/run.ts (script test:e2e); not mixed into bun test.

Covers, against the real broker (23 checks, all green): docCreate; sparqlUpdate/
Query anchored default-graph round-trip; readUnion N-doc + per-doc tolerance + cap
gate; doc_subscribe initial+write+unsub and subscribeDocs per-doc isolation; inbox
post/read/watch + spoof guard; discovery submit/read/watchIndex + reserved-account
isolation; store-registry idempotency + bounded listMyEntityDocs + scope resolvers;
caps read-filter (in-memory, honestly scoped); IdentityStore.

Finding (reported, not a failure): on @ng-org/web 0.1.2-alpha.13 an anchored
INSERT DATA { GRAPH <plainNuri> {…} } DOES round-trip (no phantom graph) — several
lib comments assert the opposite; stale, to reconcile. Behaviour is unaffected (the
lib writes the always-safe no-GRAPH default-graph shape). bun test still 91 pass.

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

bun.lock

@@ -6,6 +6,7 @@
       "name": "ng-eventually",
       "devDependencies": {
         "@types/bun": "latest",
+        "playwright": "^1.61.1",
         "typescript": "^5.6.0",
       },
     },
@@ -134,6 +135,8 @@
 
     "fs-extra": ["fs-extra@10.1.0", "", { "dependencies": { "graceful-fs": "^4.2.0", "jsonfile": "^6.0.1", "universalify": "^2.0.0" } }, "sha512-oRXApq54ETRj4eMiFzGnHWGy+zo5raudjuxN0b8H7s/RU2oW0Wvsx9O0ACRN/kRq9E8Vu/ReskGB5o3ji+FzHQ=="],
 
+    "fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
+
     "function-bind": ["function-bind@1.1.2", "", {}, "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA=="],
 
     "get-intrinsic": ["get-intrinsic@1.3.0", "", { "dependencies": { "call-bind-apply-helpers": "^1.0.2", "es-define-property": "^1.0.1", "es-errors": "^1.3.0", "es-object-atoms": "^1.1.1", "function-bind": "^1.1.2", "get-proto": "^1.0.1", "gopd": "^1.2.0", "has-symbols": "^1.1.0", "hasown": "^2.0.2", "math-intrinsics": "^1.1.0" } }, "sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ=="],
@@ -192,6 +195,10 @@
 
     "picocolors": ["picocolors@1.1.1", "", {}, "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA=="],
 
+    "playwright": ["playwright@1.61.1", "", { "dependencies": { "playwright-core": "1.61.1" }, "optionalDependencies": { "fsevents": "2.3.2" }, "bin": { "playwright": "cli.js" } }, "sha512-DWnY5o3YbLWK4GovuAVwpqL+1VwGNdUGrRr++8j8PtQQzvAVZUIMjKQ90fY689sEJZJBbZVw1rXaOKSTitkzPQ=="],
+
+    "playwright-core": ["playwright-core@1.61.1", "", { "bin": { "playwright-core": "cli.js" } }, "sha512-h7Qlt6m4REp25qvIdvbDtVmD4LqVXfpRxhORv9L0jzETM05p4fuPJ3dKyuSXQxDSbXnmS79HAgi9589lGSpLkg=="],
+
     "prettier": ["prettier@3.8.4", "", { "bin": { "prettier": "bin/prettier.cjs" } }, "sha512-N2MylSdi48+5N/6S5j+maeHbUSIzzZ5uOcX5Hm4QpV8Dkb1HFjfAKTKX6yNPJQD9AhcT3ifHNB66tWTTJDi11Q=="],
 
     "process-nextick-args": ["process-nextick-args@2.0.1", "", {}, "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="],