fix(context): repair headroom probe routing and add portal E2E gate

Use the default headroom health probe instead of the goosed fetch adapter
so active mode routes deepseek-no-think through the proxy, and add an E2E
script that verifies goosed pong via headroom with fail-open portal checks.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/baselines/.goose-v149-memory-current.json

@@ -1,7 +1,7 @@
 {
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-  "exportedAt": "2026-09-09T11:19:27.365Z",
-  "cutoverWatermarkMs": 1788952767365,
+  "exportedAt": "2026-09-09T13:36:41.959Z",
+  "cutoverWatermarkMs": 1788961001960,
   "timezone": "Asia/Shanghai",
   "textNormalization": "utf8mb4_unicode_ci",
   "scope": {
@@ -23,7 +23,7 @@
     "enabled": true,
     "connectionHost": "127.0.0.1",
     "table": "memory_embeddings",
-    "rowCount": 1325,
+    "rowCount": 1332,
     "embeddingModule": "./scripts/embed-memory-v2-local-hash.mjs",
     "dimensions": 3
   },
@@ -34,7 +34,7 @@
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-    "digest": "ce5b93bb8608aa09f52fcc67a7a5e3314032d14ae87cbe45fa1b0df66952bd15"
+    "digest": "ff0325dbf22b7c43337880cd80e53c5fd769877d4a814c16080f1d5839067be9"
   },
   "users": [
     {

docs/baselines/goose-v149-memory-latest.json

@@ -1,7 +1,7 @@
 {
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-  "exportedAt": "2026-09-09T11:18:29.173Z",
-  "cutoverWatermarkMs": 1788952709173,
+  "exportedAt": "2026-09-09T13:34:01.805Z",
+  "cutoverWatermarkMs": 1788960841806,
   "timezone": "Asia/Shanghai",
   "textNormalization": "utf8mb4_unicode_ci",
   "scope": {
@@ -23,7 +23,7 @@
     "enabled": true,
     "connectionHost": "127.0.0.1",
     "table": "memory_embeddings",
-    "rowCount": 1325,
+    "rowCount": 1332,
     "embeddingModule": "./scripts/embed-memory-v2-local-hash.mjs",
     "dimensions": 3
   },
@@ -34,7 +34,7 @@
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       "active": 1273
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-    "digest": "39da82279ead16ea0176dc515e6f2846a70118584dca13be15b131c3baf671cb"
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   "users": [
     {

docs/baselines/goose-v149-message-sanitize-latest.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": "goose-v149-message-sanitize-v2",
-  "capturedAt": "2026-09-09T11:19:08.907Z",
+  "capturedAt": "2026-09-09T13:35:24.843Z",
   "v149": {
     "root": "/Users/john/Project/tkmind_go-v149",
     "version": "1.49.0",

docs/baselines/goose-v149-thinking-preservation-latest.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": "goose-v149-thinking-preservation-v1",
-  "capturedAt": "2026-09-09T11:52:47.849Z",
+  "capturedAt": "2026-09-09T13:47:20.080Z",
   "worktree": "/Users/john/Project/tkmind_go-v149",
   "tests": [
     "test_deepseek_thinking_preserved_in_tool_call_message",