diff --git a/.github/workflows/api-sync-check.lock.yml b/.github/workflows/api-sync-check.lock.yml
index 1e33462..dc8771f 100644
--- a/.github/workflows/api-sync-check.lock.yml
+++ b/.github/workflows/api-sync-check.lock.yml
@@ -1,4 +1,4 @@
-# gh-aw-metadata: {"schema_version":"v4","frontmatter_hash":"42b773703e2b8d8b28110e2ea7b5ad06a78ad9d95f63e7bb8e85b37a12400f42","body_hash":"02f4e547ca19e7da3189e862da626398d6a8db2074d703e2fb864a1f017e23f1","compiler_version":"v0.77.5","strict":true,"agent_id":"copilot"}
+# gh-aw-metadata: {"schema_version":"v4","frontmatter_hash":"c99639db12961784956524c967f9c1b18d9bc86cd9561ddceb71cdc0464660e1","body_hash":"02f4e547ca19e7da3189e862da626398d6a8db2074d703e2fb864a1f017e23f1","compiler_version":"v0.77.5","strict":true,"agent_id":"copilot","agent_model":"claude-sonnet-5.5"}
 # gh-aw-manifest: {"version":1,"secrets":["COPILOT_GITHUB_TOKEN","GH_AW_CI_TRIGGER_TOKEN","GH_AW_GITHUB_MCP_SERVER_TOKEN","GH_AW_GITHUB_TOKEN","GITHUB_TOKEN"],"actions":[{"repo":"actions/checkout","sha":"de0fac2e4500dabe0009e67214ff5f5447ce83dd","version":"v6.0.2"},{"repo":"actions/download-artifact","sha":"3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c","version":"v8.0.1"},{"repo":"actions/github-script","sha":"3a2844b7e9c422d3c10d287c895573f7108da1b3","version":"v9.0.0"},{"repo":"actions/setup-node","sha":"48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e","version":"v6.4.0"},{"repo":"actions/upload-artifact","sha":"043fb46d1a93c77aae656e7c1c64a875d1fc6a0a","version":"v7.0.1"},{"repo":"github/gh-aw-actions/setup","sha":"v0.77.5","version":"v0.77.5"}],"containers":[{"image":"ghcr.io/github/gh-aw-firewall/agent:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/api-proxy:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/cli-proxy:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/squid:0.25.58"},{"image":"ghcr.io/github/gh-aw-mcpg:v0.3.22"},{"image":"ghcr.io/github/github-mcp-server:v1.1.0"},{"image":"node:lts-alpine","digest":"sha256:2bdb65ed1dab192432bc31c95f94155ca5ad7fc1392fb7eb7526ab682fa5bf14","pinned_image":"node:lts-alpine@sha256:2bdb65ed1dab192432bc31c95f94155ca5ad7fc1392fb7eb7526ab682fa5bf14"}]}
 #    ___                   _   _      
 #   / _ \                 | | (_)     
@@ -109,7 +109,7 @@ jobs:
         env:
           GH_AW_INFO_ENGINE_ID: "copilot"
           GH_AW_INFO_ENGINE_NAME: "GitHub Copilot CLI"
-          GH_AW_INFO_MODEL: ${{ vars.GH_AW_MODEL_AGENT_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          GH_AW_INFO_MODEL: "claude-sonnet-5.5"
           GH_AW_INFO_VERSION: "1.0.55"
           GH_AW_INFO_AGENT_VERSION: "1.0.55"
           GH_AW_INFO_CLI_VERSION: "v0.77.5"
@@ -763,7 +763,7 @@ jobs:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
-          COPILOT_MODEL: ${{ vars.GH_AW_MODEL_AGENT_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          COPILOT_MODEL: claude-sonnet-5.5
           GH_AW_MCP_CONFIG: /home/runner/.copilot/mcp-config.json
           GH_AW_PHASE: agent
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
@@ -1263,7 +1263,7 @@ jobs:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
-          COPILOT_MODEL: ${{ vars.GH_AW_MODEL_DETECTION_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          COPILOT_MODEL: claude-sonnet-5.5
           GH_AW_PHASE: detection
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
           GH_AW_VERSION: v0.77.5
@@ -1512,4 +1512,3 @@ jobs:
             /tmp/gh-aw/safe-output-items.jsonl
             /tmp/gh-aw/temporary-id-map.json
           if-no-files-found: ignore
-
diff --git a/.github/workflows/api-sync-check.md b/.github/workflows/api-sync-check.md
index cd7bf2e..ff74894 100644
--- a/.github/workflows/api-sync-check.md
+++ b/.github/workflows/api-sync-check.md
@@ -1,6 +1,9 @@
 ---
 emoji: 🔄
 description: Weekly check to keep R3Ext APIs and features in sync with ReactiveUI and DynamicData. Identifies out-of-sync APIs and opens a pull request with the necessary updates.
+engine:
+  id: copilot
+  model: claude-sonnet-5.5
 on:
   schedule: weekly on Monday
   skip-if-match: 'is:pr is:open label:api-sync in:title "[api-sync]"'
diff --git a/.github/workflows/doc-sync.lock.yml b/.github/workflows/doc-sync.lock.yml
index e615887..e618480 100644
--- a/.github/workflows/doc-sync.lock.yml
+++ b/.github/workflows/doc-sync.lock.yml
@@ -1,4 +1,4 @@
-# gh-aw-metadata: {"schema_version":"v4","frontmatter_hash":"bdbbdabc96375a018dd23ac12ef94cd4b49d10d27956c7bcb2da402423a2e4e4","body_hash":"6bf42df01c3552240e785a7e5a0222fe6322e03f2d14872681316157a75d3af4","compiler_version":"v0.77.5","strict":true,"agent_id":"copilot"}
+# gh-aw-metadata: {"schema_version":"v4","frontmatter_hash":"f68366b9d0f9f5d8938e3bc2014ad8b76f731f28929c981985535fbda88e4dfc","body_hash":"6bf42df01c3552240e785a7e5a0222fe6322e03f2d14872681316157a75d3af4","compiler_version":"v0.77.5","strict":true,"agent_id":"copilot","agent_model":"claude-sonnet-5.5"}
 # gh-aw-manifest: {"version":1,"secrets":["COPILOT_GITHUB_TOKEN","GH_AW_CI_TRIGGER_TOKEN","GH_AW_GITHUB_MCP_SERVER_TOKEN","GH_AW_GITHUB_TOKEN","GITHUB_TOKEN"],"actions":[{"repo":"actions/checkout","sha":"de0fac2e4500dabe0009e67214ff5f5447ce83dd","version":"v6.0.2"},{"repo":"actions/download-artifact","sha":"3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c","version":"v8.0.1"},{"repo":"actions/github-script","sha":"3a2844b7e9c422d3c10d287c895573f7108da1b3","version":"v9.0.0"},{"repo":"actions/setup-node","sha":"48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e","version":"v6.4.0"},{"repo":"actions/upload-artifact","sha":"043fb46d1a93c77aae656e7c1c64a875d1fc6a0a","version":"v7.0.1"},{"repo":"github/gh-aw-actions/setup","sha":"v0.77.5","version":"v0.77.5"}],"containers":[{"image":"ghcr.io/github/gh-aw-firewall/agent:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/api-proxy:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/cli-proxy:0.25.58"},{"image":"ghcr.io/github/gh-aw-firewall/squid:0.25.58"},{"image":"ghcr.io/github/gh-aw-mcpg:v0.3.22"},{"image":"ghcr.io/github/github-mcp-server:v1.1.0"},{"image":"node:lts-alpine","digest":"sha256:2bdb65ed1dab192432bc31c95f94155ca5ad7fc1392fb7eb7526ab682fa5bf14","pinned_image":"node:lts-alpine@sha256:2bdb65ed1dab192432bc31c95f94155ca5ad7fc1392fb7eb7526ab682fa5bf14"}]}
 #    ___                   _   _      
 #   / _ \                 | | (_)     
@@ -104,7 +104,7 @@ jobs:
         env:
           GH_AW_INFO_ENGINE_ID: "copilot"
           GH_AW_INFO_ENGINE_NAME: "GitHub Copilot CLI"
-          GH_AW_INFO_MODEL: ${{ vars.GH_AW_MODEL_AGENT_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          GH_AW_INFO_MODEL: "claude-sonnet-5.5"
           GH_AW_INFO_VERSION: "1.0.55"
           GH_AW_INFO_AGENT_VERSION: "1.0.55"
           GH_AW_INFO_CLI_VERSION: "v0.77.5"
@@ -756,7 +756,7 @@ jobs:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
-          COPILOT_MODEL: ${{ vars.GH_AW_MODEL_AGENT_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          COPILOT_MODEL: claude-sonnet-5.5
           GH_AW_MCP_CONFIG: /home/runner/.copilot/mcp-config.json
           GH_AW_PHASE: agent
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
@@ -1256,7 +1256,7 @@ jobs:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_DUMMY_BYOK: dummy-byok-key-for-offline-mode
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
-          COPILOT_MODEL: ${{ vars.GH_AW_MODEL_DETECTION_COPILOT || vars.GH_AW_DEFAULT_MODEL_COPILOT || 'claude-sonnet-4.6' }}
+          COPILOT_MODEL: claude-sonnet-5.5
           GH_AW_PHASE: detection
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
           GH_AW_VERSION: v0.77.5
@@ -1458,4 +1458,3 @@ jobs:
             /tmp/gh-aw/safe-output-items.jsonl
             /tmp/gh-aw/temporary-id-map.json
           if-no-files-found: ignore
-
diff --git a/.github/workflows/doc-sync.md b/.github/workflows/doc-sync.md
index c4d44cd..61f901d 100644
--- a/.github/workflows/doc-sync.md
+++ b/.github/workflows/doc-sync.md
@@ -1,6 +1,9 @@
 ---
 emoji: 📚
 description: Daily documentation sync — identifies doc files out of sync with recent code changes and opens a pull request with the necessary updates.
+engine:
+  id: copilot
+  model: claude-sonnet-5.5
 on:
   schedule: daily around 8am UTC
 permissions: