Merge branch 'main' into feature/techlog-ui-migration

Integrates the frontend template sync (a0fbafb → 5434760) into the TechLog UI
migration. Merged in this direction so every conflict is resolved and proved in
the worktree; main is only fast-forwarded afterwards and never holds a state
that was not verified here.

15 conflicts. The rule throughout: keep the template's mechanism, keep the
product's content, and never invent a third state neither branch would accept.

The template's product manifest and its runtime feature kill switch are adopted.
The route registry is deliberately not composed from contract.routes: the
reference feature still declares screens this product deleted, and reducing over
them would register paths with no component behind them. ROUTE_FEATURE_OWNER is
narrowed to registered routes for the same reason. The first resolution did
compose from contract.routes and was rejected by product-features.test.ts.

Three files pinned counts and a digest describing the gate contract. Neither
side's numbers describe the merged config/ci/gates.json, so they were recomputed
from it rather than chosen: 27 gates, 82 commands, 94 command references, 107
evidence references, 128 artifacts, shape sha256 5063586d.

README.md and docs/accessibility/manual-checklist.md now enumerate this
product's 27 routes, which the template's own verify:documentation requires.

product-feature-switch.test.tsx was rewritten around the invariant that still
applies here — no registered route without a component — rather than deleted
with the screens it used to exercise.

docs/operations/template-merge-2026-08-17.md records every decision, the gate
results, and the three follow-ups this merge deliberately did not decide.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

config/ci/gates.json

@@ -472,6 +472,11 @@
       "id": "check-ci",
       "script": "check:ci",
       "expect": "pass"
+    },
+    {
+      "id": "check-release-admission",
+      "script": "check:release-admission",
+      "expect": "pass"
     }
   ],
   "artifactSchemas": [
@@ -732,6 +737,12 @@
       "id": "sarif-secret-scan",
       "kind": "sarif",
       "maxBytes": 67108864
+    },
+    {
+      "id": "json-deployment-admission",
+      "kind": "json",
+      "maxBytes": 67108864,
+      "executableSchemaId": "deployment-admission"
     }
   ],
   "artifacts": [
@@ -1710,6 +1721,21 @@
       "producerCommandIds": [
         "check-ci"
       ]
+    },
+    {
+      "id": "artifact-artifacts-release-deployment-admission-json",
+      "path": "artifacts/release/deployment-admission.json",
+      "schemaId": "json-deployment-admission",
+      "production": "command-generated",
+      "producerCommandIds": [
+        "check-release-admission"
+      ]
+    },
+    {
+      "id": "artifact-artifacts-quality-gates-FE-GATE-027-txt",
+      "path": "artifacts/quality/gates/FE-GATE-027.txt",
+      "schemaId": "text",
+      "production": "runner-generated"
     }
   ],
   "gates": [
@@ -2178,6 +2204,18 @@
         "artifact-artifacts-performance-lab-json"
       ],
       "retentionClassId": "release-coherence"
+    },
+    {
+      "id": "FE-GATE-027",
+      "name": "release-admission",
+      "commandIds": [
+        "check-release-admission"
+      ],
+      "logArtifactId": "artifact-artifacts-quality-gates-FE-GATE-027-txt",
+      "evidenceArtifactIds": [
+        "artifact-artifacts-release-deployment-admission-json"
+      ],
+      "retentionClassId": "release-coherence"
     }
   ],
   "stages": [
@@ -2212,7 +2250,8 @@
         "FE-GATE-014",
         "FE-GATE-015",
         "FE-GATE-019",
-        "FE-GATE-026"
+        "FE-GATE-026",
+        "FE-GATE-027"
       ]
     },
     {
@@ -2365,10 +2404,20 @@
       "condition": "release",
       "timeoutMinutes": 45,
       "gateIds": [
-        "FE-GATE-015"
+        "FE-GATE-015",
+        "FE-GATE-027"
       ],
       "browserGateIds": [],
-      "environment": [],
+      "environment": [
+        {
+          "name": "APP_PROFILE",
+          "value": "${{ vars.APP_PROFILE }}"
+        },
+        {
+          "name": "RELEASE_TARGET",
+          "value": "${{ vars.RELEASE_TARGET }}"
+        }
+      ],
       "steps": [
         {
           "kind": "checkout"