Demote scenario-builds CI to manual-only (workflow_dispatch) (#1448)

The scenario compile checks are redundant with the per-language SDK test
workflows (dotnet-sdk-tests, go-sdk-tests, java-sdk-tests, etc.) which
already build and test the SDK on every PR. The scenarios remain in the
repo as documentation/examples and can still be verified on-demand.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: patniko

.github/workflows/scenario-builds.yml

@@ -3,9 +3,6 @@
 docs/.validation/
 .DS_Store
 
-# Rust scenario build artifacts
-test/scenarios/**/rust/target/
-test/scenarios/**/rust/Cargo.lock
 
 # Visual Studio
 .vs/

.gitignore

@@ -169,111 +169,3 @@ validate-docs-cs:
     @echo "=== Validating C# documentation ==="
     @cd scripts/docs-validation && npm run validate:cs
 
-# Build all scenario samples (all languages)
-scenario-build:
-    #!/usr/bin/env bash
-    set -euo pipefail
-    echo "=== Building all scenario samples ==="
-    TOTAL=0; PASS=0; FAIL=0
-
-    build_lang() {
-      local lang="$1" find_expr="$2" build_cmd="$3"
-      echo ""
-      echo "── $lang ──"
-      while IFS= read -r target; do
-        [ -z "$target" ] && continue
-        dir=$(dirname "$target")
-        scenario="${dir#test/scenarios/}"
-        TOTAL=$((TOTAL + 1))
-        if (cd "$dir" && eval "$build_cmd" >/dev/null 2>&1); then
-          printf "  ✅ %s\n" "$scenario"
-          PASS=$((PASS + 1))
-        else
-          printf "  ❌ %s\n" "$scenario"
-          FAIL=$((FAIL + 1))
-        fi
-      done < <(find test/scenarios $find_expr | sort)
-    }
-
-    # TypeScript: npm install
-    (cd nodejs && npm ci --ignore-scripts --silent 2>/dev/null) || true
-    build_lang "TypeScript" "-path '*/typescript/package.json'" "npm install --ignore-scripts"
-
-    # Python: syntax check
-    build_lang "Python" "-path '*/python/main.py'" "python3 -c \"import ast; ast.parse(open('main.py').read())\""
-
-    # Go: go build
-    build_lang "Go" "-path '*/go/go.mod'" "go build ./..."
-
-    # C#: dotnet build
-    build_lang "C#" "-name '*.csproj' -path '*/csharp/*'" "dotnet build --nologo -v quiet"
-
-    echo ""
-    echo "══════════════════════════════════════"
-    echo " Scenario build summary: $PASS passed, $FAIL failed (of $TOTAL)"
-    echo "══════════════════════════════════════"
-    [ "$FAIL" -eq 0 ]
-
-# Run the full scenario verify orchestrator (build + E2E, needs real CLI)
-scenario-verify:
-    @echo "=== Running scenario verification ==="
-    @bash test/scenarios/verify.sh
-
-# Build scenarios for a single language (typescript, python, go, csharp)
-scenario-build-lang LANG:
-    #!/usr/bin/env bash
-    set -euo pipefail
-    echo "=== Building {{LANG}} scenarios ==="
-    PASS=0; FAIL=0
-
-    case "{{LANG}}" in
-      typescript)
-        (cd nodejs && npm ci --ignore-scripts --silent 2>/dev/null) || true
-        for target in $(find test/scenarios -path '*/typescript/package.json' | sort); do
-          dir=$(dirname "$target"); scenario="${dir#test/scenarios/}"
-          if (cd "$dir" && npm install --ignore-scripts >/dev/null 2>&1); then
-            printf "  ✅ %s\n" "$scenario"; PASS=$((PASS + 1))
-          else
-            printf "  ❌ %s\n" "$scenario"; FAIL=$((FAIL + 1))
-          fi
-        done
-        ;;
-      python)
-        for target in $(find test/scenarios -path '*/python/main.py' | sort); do
-          dir=$(dirname "$target"); scenario="${dir#test/scenarios/}"
-          if python3 -c "import ast; ast.parse(open('$target').read())" 2>/dev/null; then
-            printf "  ✅ %s\n" "$scenario"; PASS=$((PASS + 1))
-          else
-            printf "  ❌ %s\n" "$scenario"; FAIL=$((FAIL + 1))
-          fi
-        done
-        ;;
-      go)
-        for target in $(find test/scenarios -path '*/go/go.mod' | sort); do
-          dir=$(dirname "$target"); scenario="${dir#test/scenarios/}"
-          if (cd "$dir" && go build ./... >/dev/null 2>&1); then
-            printf "  ✅ %s\n" "$scenario"; PASS=$((PASS + 1))
-          else
-            printf "  ❌ %s\n" "$scenario"; FAIL=$((FAIL + 1))
-          fi
-        done
-        ;;
-      csharp)
-        for target in $(find test/scenarios -name '*.csproj' -path '*/csharp/*' | sort); do
-          dir=$(dirname "$target"); scenario="${dir#test/scenarios/}"
-          if (cd "$dir" && dotnet build --nologo -v quiet >/dev/null 2>&1); then
-            printf "  ✅ %s\n" "$scenario"; PASS=$((PASS + 1))
-          else
-            printf "  ❌ %s\n" "$scenario"; FAIL=$((FAIL + 1))
-          fi
-        done
-        ;;
-      *)
-        echo "Unknown language: {{LANG}}. Use: typescript, python, go, csharp"
-        exit 1
-        ;;
-    esac
-
-    echo ""
-    echo "{{LANG}} scenarios: $PASS passed, $FAIL failed"
-    [ "$FAIL" -eq 0 ]