feat(webui): the workspace panel is a browser tab strip

.plan/browser-use/complete/isolated-chromium.acceptance.json

@@ -16,7 +16,7 @@
     },
     "observed": "a pointer click and a text input both arrived in the page the provider was driving",
     "result": "pass",
-    "at": "2026-10-21T11:54:23.014Z",
+    "at": "2026-10-21T20:11:49.442Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "isolated-chromium"
   },
@@ -37,7 +37,7 @@
     },
     "observed": "the stale identity was refused with browser_target_stale and the page that replaced it received nothing",
     "result": "pass",
-    "at": "2026-10-21T11:54:24.551Z",
+    "at": "2026-10-21T20:11:50.962Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "isolated-chromium"
   }

.plan/browser-use/complete/real-browser.acceptance.json

@@ -13,12 +13,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the handshake completed and the host reported the surface connected",
     "result": "pass",
-    "at": "2026-10-21T11:45:49.589Z",
+    "at": "2026-10-21T19:27:12.077Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-browser"
   },
@@ -36,12 +36,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": false
     },
     "observed": "the host refused the extension and reported no connected surface",
     "result": "pass",
-    "at": "2026-10-21T11:45:49.934Z",
+    "at": "2026-10-21T19:27:12.388Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-browser"
   },
@@ -59,12 +59,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the handshake completed and the host reported the surface connected",
     "result": "pass",
-    "at": "2026-10-21T11:45:50.315Z",
+    "at": "2026-10-21T19:27:12.712Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-browser"
   },
@@ -82,12 +82,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": false
     },
     "observed": "the host refused the extension and reported no connected surface",
     "result": "pass",
-    "at": "2026-10-21T11:45:50.734Z",
+    "at": "2026-10-21T19:27:13.062Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-browser"
   },
@@ -105,12 +105,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development, on both surfaces",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "both browsers were connected, each on its own surface, and each surface's provider belonged to that surface",
     "result": "pass",
-    "at": "2026-10-21T11:45:51.751Z",
+    "at": "2026-10-21T19:27:13.921Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-browser"
   }

.plan/browser-use/complete/real-external.acceptance.json

@@ -13,12 +13,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the host noticed the terminated worker, the surface went down and came back, and a command against the live tab answered again",
     "result": "pass",
-    "at": "2026-10-21T11:45:53.073Z",
+    "at": "2026-10-21T19:27:15.162Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   },
@@ -36,12 +36,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the text the host sent appeared in the page's field, and a non-empty image frame for that page arrived at the host",
     "result": "pass",
-    "at": "2026-10-21T11:45:53.694Z",
+    "at": "2026-10-21T19:27:15.714Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   },
@@ -59,12 +59,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the command in the allowed subset answered with the page's title, and a command outside it was refused as unsupported",
     "result": "pass",
-    "at": "2026-10-21T11:45:54.021Z",
+    "at": "2026-10-21T19:27:16.023Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   },
@@ -82,12 +82,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the host noticed the terminated worker, the surface went down and came back, and a command against the live tab answered again",
     "result": "pass",
-    "at": "2026-10-21T11:45:55.053Z",
+    "at": "2026-10-21T19:27:16.993Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   },
@@ -105,12 +105,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the text the host sent appeared in the page's field, and a non-empty image frame for that page arrived at the host",
     "result": "pass",
-    "at": "2026-10-21T11:45:55.726Z",
+    "at": "2026-10-21T19:27:18.015Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   },
@@ -128,12 +128,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "development",
-      "extensionId": "dejpmdkbdhkjjhkjkodimegojblnglde",
+      "extensionId": "njihcobnpalklclcjdhfnlcdonhhiddm",
       "installationKeyProved": true
     },
     "observed": "the command in the allowed subset answered with the page's title, and a command outside it was refused as unsupported",
     "result": "pass",
-    "at": "2026-10-21T11:45:56.175Z",
+    "at": "2026-10-21T19:27:18.417Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-external"
   }

.plan/browser-use/complete/real-packaged.acceptance.json

@@ -9,12 +9,12 @@
       "surface": "chrome",
       "build": "store",
       "allowlist": "store",
-      "extensionId": "ejnneljbcbiapcamdfmgfkaappehipac",
+      "extensionId": "klfboeijbpnckbjcbjanlheebbhgmpbl",
       "installationKeyProved": true
     },
-    "observed": "the browser assigned the extension the id the public key determines (ejnneljbcbiapcamdfmgfkaappehipac)",
+    "observed": "the browser assigned the extension the id the public key determines (klfboeijbpnckbjcbjanlheebbhgmpbl)",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.026Z",
+    "at": "2026-10-21T19:27:19.196Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -28,12 +28,12 @@
       "surface": "chrome",
       "build": "store",
       "allowlist": "store",
-      "extensionId": "ejnneljbcbiapcamdfmgfkaappehipac",
+      "extensionId": "klfboeijbpnckbjcbjanlheebbhgmpbl",
       "installationKeyProved": true
     },
     "observed": "the packaged manifest carries the store's public key and differs from the development manifest in nothing else",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.028Z",
+    "at": "2026-10-21T19:27:19.197Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -51,12 +51,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "store",
       "build": "store",
-      "extensionId": "ejnneljbcbiapcamdfmgfkaappehipac",
+      "extensionId": "klfboeijbpnckbjcbjanlheebbhgmpbl",
       "installationKeyProved": true
     },
     "observed": "the packaged host completed the handshake and reported the surface connected",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.107Z",
+    "at": "2026-10-21T19:27:19.283Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -74,12 +74,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "store",
-      "extensionId": "ejnneljbcbiapcamdfmgfkaappehipac",
+      "extensionId": "klfboeijbpnckbjcbjanlheebbhgmpbl",
       "installationKeyProved": true
     },
     "observed": "the packaged host refused the extension and reported no connected surface",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.153Z",
+    "at": "2026-10-21T19:27:19.330Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -93,12 +93,12 @@
       "surface": "edge",
       "build": "store",
       "allowlist": "store",
-      "extensionId": "gaflfamaoomjenkedomchkimnkabfkmo",
+      "extensionId": "edppplbagledhnfaipdcjbfefdbaoddg",
       "installationKeyProved": true
     },
-    "observed": "the browser assigned the extension the id the public key determines (gaflfamaoomjenkedomchkimnkabfkmo)",
+    "observed": "the browser assigned the extension the id the public key determines (edppplbagledhnfaipdcjbfefdbaoddg)",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.930Z",
+    "at": "2026-10-21T19:27:20.035Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -112,12 +112,12 @@
       "surface": "edge",
       "build": "store",
       "allowlist": "store",
-      "extensionId": "gaflfamaoomjenkedomchkimnkabfkmo",
+      "extensionId": "edppplbagledhnfaipdcjbfefdbaoddg",
       "installationKeyProved": true
     },
     "observed": "the packaged manifest carries the store's public key and differs from the development manifest in nothing else",
     "result": "pass",
-    "at": "2026-10-21T11:45:57.931Z",
+    "at": "2026-10-21T19:27:20.036Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -135,12 +135,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "store",
       "build": "store",
-      "extensionId": "gaflfamaoomjenkedomchkimnkabfkmo",
+      "extensionId": "edppplbagledhnfaipdcjbfefdbaoddg",
       "installationKeyProved": true
     },
     "observed": "the packaged host completed the handshake and reported the surface connected",
     "result": "pass",
-    "at": "2026-10-21T11:45:58.024Z",
+    "at": "2026-10-21T19:27:20.106Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   },
@@ -158,12 +158,12 @@
       "fullCdp": "enforced in the runtime service, not in the bridge",
       "allowlist": "development",
       "build": "store",
-      "extensionId": "gaflfamaoomjenkedomchkimnkabfkmo",
+      "extensionId": "edppplbagledhnfaipdcjbfefdbaoddg",
       "installationKeyProved": true
     },
     "observed": "the packaged host refused the extension and reported no connected surface",
     "result": "pass",
-    "at": "2026-10-21T11:45:58.097Z",
+    "at": "2026-10-21T19:27:20.158Z",
     "os": "linux 7.0.0-38-generic",
     "suite": "real-packaged"
   }

.plan/workspace-browser-tab/complete/README.md

@@ -3,15 +3,16 @@
 This directory is where the workspace browser tab model's **completion evidence** will live: the
 records the suites write while they run, and the completion note.
 
-The plan is [`../workspace-browser-tab-plan.md`](../workspace-browser-tab-plan.md). There is no
-execution board for this programme yet, and none of the work has started.
+The plan is [`../workspace-browser-tab-plan.md`](../workspace-browser-tab-plan.md). The execution board is
+[`../board/`](../board/), and the work has started.
 
 ## What belongs here
 
 | File | Written by | What it holds |
 | --- | --- | --- |
 | `<suite>.acceptance.json` | the Playwright suites, through `packages/webui/test/browser/acceptance-record.ts` | one record per case: what was set up, what was observed, and what the person saw |
 | `*.evidence.json` | a probe run by hand | what a real isolated Chromium did, on the machine named in the record |
+| `two-page-spike.json` | the issue #200 spike, run by hand against a real isolated Chromium | what the browser can do with two pages at once, and what the repository's provider does today — the matrix in `packages/webui/docs/browser-use/01-capability-matrix.md` is written from it |
 
 The published acceptance record for this work is
 `packages/webui/docs/browser-use/09-acceptance-record.md`, and the decision record is