fix(ci): remove Quaternions registry auth; add canvas WASM drift guard

Dockerfile:
- Drop --mount=type=secret,id=cargo_token: the Quaternions private
  registry has been migrated to the public Cargo.io path so the build
  secret is no longer needed. Removes the requirement for CI_TOKEN to
  carry registry credentials.

CI workflow (docker-build.yml):
- Add solitaire_wasm/** and solitaire_web/** to the push-trigger paths
  so changes to either WASM crate actually fire the build job.
- Add wasm drift check for solitaire_wasm artifacts (solitaire_wasm.js,
  solitaire_wasm_bg.wasm) — exits 1 if solitaire_wasm/ or solitaire_core/
  changed without updating the committed pkg files.
- Add hard canvas drift check: solitaire_web/ changes MUST update
  canvas_bg.wasm or the deploy gets a stale Bevy binary.
- Add advisory notice for solitaire_engine/ / solitaire_core/ changes
  that omit a canvas_bg.wasm rebuild (non-blocking; formatting commits
  should not fail CI).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/docker-build.yml

@@ -6,6 +6,8 @@ on:
     branches: [master]
     paths:
       - 'solitaire_server/**'
+      - 'solitaire_wasm/**'
+      - 'solitaire_web/**'
       - 'solitaire_sync/**'
       - 'solitaire_core/**'
       - 'solitaire_engine/**'
@@ -34,6 +36,48 @@ jobs:
         id: meta
         run: echo "sha=${GITHUB_SHA::8}" >> "$GITHUB_OUTPUT"
 
+      - name: Check wasm pkg drift
+        run: |
+          set -euo pipefail
+          BASE_SHA="${{ github.event.before }}"
+          HEAD_SHA="${{ github.sha }}"
+          if [ -n "$BASE_SHA" ] && git cat-file -e "$BASE_SHA^{commit}" 2>/dev/null; then
+            RANGE="$BASE_SHA..$HEAD_SHA"
+          else
+            RANGE="HEAD~1..HEAD"
+          fi
+
+          CHANGED="$(git diff --name-only "$RANGE")"
+          echo "Changed files:"
+          echo "$CHANGED"
+
+          if echo "$CHANGED" | grep -Eq '^(solitaire_wasm/|solitaire_core/|Cargo\.toml|Cargo\.lock)$|^(solitaire_wasm/|solitaire_core/)'; then
+            if ! echo "$CHANGED" | grep -Eq '^solitaire_server/web/pkg/solitaire_wasm\.js$|^solitaire_server/web/pkg/solitaire_wasm_bg\.wasm$'; then
+              echo "error: wasm/core/Cargo changed but committed web pkg artifacts are missing."
+              echo "Run: wasm-pack build --target web --out-dir solitaire_server/web/pkg --no-typescript solitaire_wasm"
+              exit 1
+            fi
+          fi
+
+          # Hard check: solitaire_web/ is the direct Bevy WASM source — any
+          # change there MUST rebuild canvas_bg.wasm or the binary goes stale.
+          if echo "$CHANGED" | grep -Eq '^solitaire_web/'; then
+            if ! echo "$CHANGED" | grep -Eq '^solitaire_server/web/pkg/canvas_bg\.wasm$'; then
+              echo "error: solitaire_web/ changed but canvas_bg.wasm not updated."
+              echo "Run: ./build_wasm.sh  (requires wasm-bindgen-cli + wasm32-unknown-unknown target)"
+              exit 1
+            fi
+          fi
+
+          # Advisory notice: solitaire_engine/ and solitaire_core/ changes often
+          # require a Bevy WASM rebuild but are not enforced (formatting-only
+          # commits should not be blocked).
+          if echo "$CHANGED" | grep -Eq '^(solitaire_engine/|solitaire_core/)' && \
+             ! echo "$CHANGED" | grep -Eq '^solitaire_server/web/pkg/canvas_bg\.wasm$'; then
+            echo "notice: solitaire_engine/core changed without a canvas_bg.wasm rebuild."
+            echo "        If the change affects gameplay run ./build_wasm.sh before pushing."
+          fi
+
       - name: Log in to Gitea registry
         uses: docker/login-action@v3
         with:
@@ -57,8 +101,6 @@ jobs:
             ${{ env.IMAGE }}:latest
           cache-from: type=registry,ref=${{ env.IMAGE }}:buildcache
           cache-to: type=registry,ref=${{ env.IMAGE }}:buildcache,mode=max
-          secrets: |
-            cargo_token=${{ secrets.CI_TOKEN }}
 
       - name: Install kustomize
         run: |