refactor: Replace int.Parse with TryParse for safe parsing (#1667)

Replace unsafe int.Parse/long.Parse with TryParse for proper error
handling in build modules:

- SkipIfDependencyPullRequest: Handle invalid RefName and RepositoryId
  by returning true (skip the check) instead of throwing FormatException
- CreateReleaseModule: Throw clear InvalidOperationException with
  context if RepositoryId parsing fails

Fixes #1641
Fixes #1642

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: thomhurst

src/ModularPipelines.Build/Attributes/SkipIfDependencyPullRequest.cs

@@ -1,4 +1,4 @@
-using ModularPipelines.Attributes;
+using ModularPipelines.Attributes;
 using ModularPipelines.Context;
 using ModularPipelines.GitHub.Extensions;
 
@@ -15,10 +15,19 @@ public override async Task<bool> Condition(IPipelineHookContext pipelineContext)
             return true;
         }
 
-        var prNumber = int.Parse(gitHubEnvironmentVariables.RefName!.Split('/').First());
+        var refNamePart = gitHubEnvironmentVariables.RefName?.Split('/').FirstOrDefault();
+        if (!int.TryParse(refNamePart, out var prNumber))
+        {
+            return true;
+        }
+
+        if (!long.TryParse(gitHubEnvironmentVariables.RepositoryId, out var repositoryId))
+        {
+            return true;
+        }
 
-        var pr = await pipelineContext.GitHub().Client.PullRequest.Get(int.Parse(gitHubEnvironmentVariables.RepositoryId!), prNumber);
+        var pr = await pipelineContext.GitHub().Client.PullRequest.Get(repositoryId, prNumber);
 
         return pr.Labels.All(x => x.Name != "dependencies");
     }
-}
+}

src/ModularPipelines.Build/Modules/CreateReleaseModule.cs

@@ -53,11 +53,17 @@ public async Task<SkipDecision> ShouldSkip(IPipelineContext context)
     {
         var versionInfoResult = context.GetModule<NugetVersionGeneratorModule, string>();
 
-        return await context.GitHub().Client.Repository.Release.Create(long.Parse(context.GitHub().EnvironmentVariables.RepositoryId!),
+        var repositoryIdString = context.GitHub().EnvironmentVariables.RepositoryId;
+        if (!long.TryParse(repositoryIdString, out var repositoryId))
+        {
+            throw new InvalidOperationException($"Failed to parse RepositoryId '{repositoryIdString}' as a valid long integer.");
+        }
+
+        return await context.GitHub().Client.Repository.Release.Create(repositoryId,
             new NewRelease($"v{versionInfoResult.Value}")
             {
                 Name = versionInfoResult.Value,
                 GenerateReleaseNotes = true,
             });
     }
-}
+}