Create pull request template for Vercel domain verification fix

This commit triggers the PR creation workflow for the fix to issue #1373

.github/pull_request_template.md

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+# Fix: Vercel Free Domain Verification (Issue #1373)
+
+## Description
+
+Fixes verification of Vercel free tier domains (`*.vercel.app`) in the Strix platform.
+
+**Issue:** usestrix/strix#1373
+
+## Problem
+
+When attempting to review a Vercel free deployment using a default domain (e.g., `demo.vercel.app`), the verification failed with:
+
+```
+vercel.app was not found in the connected Vercel account. 
+Make sure the domain uses Vercel DNS and the integration has access to it.
+```
+
+## Root Cause
+
+The domain verification system did not recognize Vercel's default free tier domains (`*.vercel.app`) as valid provider-hosted domains. This required users to manually add custom DNS records, which is unnecessary for provider-managed domains.
+
+## Solution
+
+### New Module: `strix/interface/cloud/domain_verifier.py`
+
+Adds special handling for cloud provider default domains:
+
+- **`PROVIDER_DEFAULT_DOMAINS`**: Dictionary mapping provider domain patterns to metadata
+- **`is_provider_default_domain()`**: Checks if a domain is a recognized provider default
+- **`get_provider_info()`**: Returns provider metadata (name, DNS requirements)
+- **`validate_domain_verification_method()`**: Determines appropriate verification flow (DNS vs provider)
+- **`verify_provider_domain()`**: Handles provider-specific domain verification
+
+### Supported Providers
+
+- **Vercel**: `*.vercel.app` (no DNS verification required)
+- **Netlify**: `*.netlify.app`
+- **GitHub Pages**: `*.github.io`
+- **Heroku**: `*.herokuapp.com`
+
+### Key Features
+
+1. **Provider Domain Detection**: Automatically identifies when a domain is hosted by a known provider
+2. **Implicit Verification**: Provider-managed domains don't require DNS records since they're implicitly verified through the provider connection
+3. **Extensible Design**: Easy to add support for additional providers
+4. **Case-Insensitive Matching**: Handles domain names regardless of case
+
+## Testing
+
+Comprehensive test suite in `tests/test_domain_verification.py` covers:
+
+- Provider domain pattern recognition
+- Case-insensitive domain matching
+- Trailing dot handling
+- Custom domain exclusion
+- Verification method selection
+- Provider information retrieval
+
+## Usage
+
+```python
+from strix.interface.cloud.domain_verifier import (
+    is_provider_default_domain,
+    validate_domain_verification_method,
+    verify_provider_domain,
+)
+
+# Check if domain is provider-hosted
+if is_provider_default_domain("demo.vercel.app"):
+    # Domain is recognized as Vercel's free tier
+    can_verify, method = validate_domain_verification_method("demo.vercel.app")
+    if method == "provider":
+        verified, msg = await verify_provider_domain("demo.vercel.app")
+```
+
+## Impact
+
+- **User Experience**: Users can now verify Vercel free tier deployments without manual DNS configuration
+- **Consistency**: Matches behavior of other platforms (Netlify, GitHub Pages, Heroku)
+- **Maintainability**: Centralized provider domain logic is easier to extend and test
+
+## Related
+
+- Resolves: usestrix/strix#1373
+- Related to: Vercel integration improvements