refactor(test): optimize test suite with helper deduplication

Added new test helper functions:
- expectValidPackageStructure: validates package structure (3 lines → 1 line)
- Feature detection helpers: describeIfMap, describeIfSet, itIfMap, itIfSet
- Consolidates 9 inline feature checks across test files

Test optimizations:
- Migrated is-regex.test.mts to createTypeCheckerTests (66 → 48 lines, 27% reduction)
- Updated deep-equal.test.mts with describeIfMap/describeIfSet (saved 29 lines)
- Updated assert.test.mts, object-keys.test.mts with expectValidPackageStructure

Documentation:
- Moved test/utils/TEST_HELPERS_README.md → docs/test-helpers.md
- Updated with new helpers and recent optimizations
- Follows lowercase-with-hyphens naming convention

Workflow updates:
- Updated all GitHub Actions to use current main SHA (42af851)
- Fixed ci.yml to reference historical SHA for removed sub-workflows
- Aligned cache actions to use actions/cache@v4.3.0

Total impact: 59 lines saved, improved maintainability, zero concurrency issues found.

Author: jdalton

.github/actions/cache-build/action.yml

@@ -12,7 +12,7 @@ runs:
   using: 'composite'
   steps:
     - name: Cache build artifacts
-      uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
       with:
         path: |
           registry/dist

.github/actions/setup/action.yml

@@ -36,7 +36,7 @@ runs:
   using: 'composite'
   steps:
     - name: Setup debug
-      uses: SocketDev/socket-registry/.github/actions/debug@51be85d39d3b4a42dd9d4712948b9d30a2e04794 # main
+      uses: SocketDev/socket-registry/.github/actions/debug@42af85173896eefdd299364a2200d308b1c63caa # main
       with:
         debug: ${{ inputs.debug }}
 

.github/workflows/_local-not-for-reuse-ci.yml

@@ -17,7 +17,7 @@ permissions:
 jobs:
   ci:
     name: Run CI Pipeline
-    uses: SocketDev/socket-registry/.github/workflows/ci.yml@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # 2025-10-28
+    uses: SocketDev/socket-registry/.github/workflows/ci.yml@42af85173896eefdd299364a2200d308b1c63caa # main
     with:
       fail-fast: false
       lint-script: 'pnpm run lint --all'
@@ -38,11 +38,11 @@ jobs:
         with:
           autocrlf: false
 
-      - uses: SocketDev/socket-registry/.github/actions/setup-and-install@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # main
+      - uses: SocketDev/socket-registry/.github/actions/setup-and-install@42af85173896eefdd299364a2200d308b1c63caa # main
         with:
           node-version: 22
 
-      - uses: SocketDev/socket-registry/.github/actions/cache-npm-packages@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # main
+      - uses: SocketDev/socket-registry/.github/actions/cache-npm-packages@42af85173896eefdd299364a2200d308b1c63caa # main
 
       - name: Build registry
         run: pnpm run build

.github/workflows/_local-not-for-reuse-claude-auto-review.yml

@@ -15,6 +15,6 @@ permissions:
 
 jobs:
   auto-review:
-    uses: SocketDev/socket-registry/.github/workflows/claude-auto-review.yml@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # 2025-10-28
+    uses: SocketDev/socket-registry/.github/workflows/claude-auto-review.yml@42af85173896eefdd299364a2200d308b1c63caa # main
     secrets:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}

.github/workflows/_local-not-for-reuse-claude.yml

@@ -22,6 +22,6 @@ permissions:
 
 jobs:
   claude:
-    uses: SocketDev/socket-registry/.github/workflows/claude.yml@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # 2025-10-28
+    uses: SocketDev/socket-registry/.github/workflows/claude.yml@42af85173896eefdd299364a2200d308b1c63caa # main
     secrets:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}

.github/workflows/_local-not-for-reuse-provenance.yml

@@ -26,7 +26,7 @@ permissions:
 
 jobs:
   publish:
-    uses: SocketDev/socket-registry/.github/workflows/provenance.yml@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # 2025-10-28
+    uses: SocketDev/socket-registry/.github/workflows/provenance.yml@42af85173896eefdd299364a2200d308b1c63caa # main
     with:
       debug: ${{ inputs.debug }}
       force-publish: ${{ inputs.force-publish }}

.github/workflows/_local-not-for-reuse-socket-auto-pr.yml

@@ -24,7 +24,7 @@ permissions:
 
 jobs:
   socket-auto-pr:
-    uses: SocketDev/socket-registry/.github/workflows/socket-auto-pr.yml@e7f70a7eb857a85b4f30677f9fc2c38bc9c4d56e # 2025-10-28
+    uses: SocketDev/socket-registry/.github/workflows/socket-auto-pr.yml@42af85173896eefdd299364a2200d308b1c63caa # main
     with:
       debug: ${{ inputs.debug }}
       autopilot: true

.github/workflows/claude-auto-review.yml

@@ -64,7 +64,7 @@ jobs:
           autocrlf: false
 
       - name: Setup debug
-        uses: SocketDev/socket-registry/.github/actions/debug@51be85d39d3b4a42dd9d4712948b9d30a2e04794 # main
+        uses: SocketDev/socket-registry/.github/actions/debug@42af85173896eefdd299364a2200d308b1c63caa # main
         with:
           debug: ${{ inputs.debug }}
 

.github/workflows/claude.yml

@@ -45,7 +45,7 @@ jobs:
           autocrlf: false
 
       - name: Setup debug
-        uses: SocketDev/socket-registry/.github/actions/debug@51be85d39d3b4a42dd9d4712948b9d30a2e04794 # main
+        uses: SocketDev/socket-registry/.github/actions/debug@42af85173896eefdd299364a2200d308b1c63caa # main
         with:
           debug: ${{ inputs.debug }}
 

.github/workflows/provenance.yml

@@ -97,7 +97,7 @@ jobs:
             fi
           fi
 
-      - uses: SocketDev/socket-registry/.github/actions/setup-and-install@51be85d39d3b4a42dd9d4712948b9d30a2e04794 # main
+      - uses: SocketDev/socket-registry/.github/actions/setup-and-install@42af85173896eefdd299364a2200d308b1c63caa # main
         with:
           node-version: ${{ inputs.node-version }}
           debug: ${{ inputs.debug }}