[WIP] Fix failing GitHub Actions workflow test

[Copilot]

Fix test failures due to repository migration from githubnext/gh-aw to github/gh-aw

The tests were failing because some test cases had URLs with github.com/github/gh-aw but still expected the owner to be githubnext. This is due to the repository being migrated from githubnext/gh-aw to github/gh-aw.

Plan:

• Identify all failing tests
• Fix pkg/repoutil/repoutil_test.go - TestParseGitHubURL
• Fix pkg/cli/git_helpers_test.go - TestParseGitHubRepoSlugFromURL
• Fix pkg/parser/github_urls_test.go - TestParseGitHubURL_FileURLs and TestParseRunURL
• Fix pkg/cli/spec_github_url_test.go - TestParseGitHubURL
• Fix pkg/cli/spec_test.go - TestParseWorkflowSpec
• Fix Serena MCP server container references in test files
• Update comment in pkg/workflow/mcp_config_serena_renderer.go
• Run tests to verify all fixes work
• Run full validation before committing

Changes Made:

1. URL parsing tests: Updated expected owner from "githubnext" to "github" in test cases where URLs contain github.com/github/gh-aw
2. Serena container image: Updated test expectations from ghcr.io/githubnext/serena-mcp-server to ghcr.io/github/serena-mcp-server
3. Documentation: Updated comment to reflect correct container image path

All unit tests now pass successfully ✅

Original prompt

Fix the failing GitHub Actions workflow test
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62280916079
Job URL: https://github.com/github/gh-aw/actions/runs/21611451449/job/62280916079

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[Copilot]

Pull request overview

Updates test fixtures and documentation to reflect the repository migration from githubnext/gh-aw to github/gh-aw, eliminating mismatched expectations in URL parsing and workflow-related tests.

Changes:

• Updated URL parsing test expectations where URLs already reference github/… but tests still expected githubnext.
• Updated Serena MCP server container image expectations from ghcr.io/githubnext/serena-mcp-server to ghcr.io/github/serena-mcp-server.
• Updated an in-code comment documenting the default Serena container image.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/workflow/mcp_config_serena_renderer.go	Updates documentation comment to reference the correct Serena container image path.
pkg/workflow/mcp_config_comprehensive_test.go	Aligns Serena container expectations with the new ghcr.io/github/... image path.
pkg/workflow/importable_tools_test.go	Updates compiled workflow assertions to the new Serena container image location.
pkg/repoutil/repoutil_test.go	Fixes GitHub URL parsing test expectation for migrated github/gh-aw repo URL.
pkg/parser/github_urls_test.go	Updates GitHub URL parsing expectations (owner) for migrated URLs and run/job URL case.
pkg/cli/spec_test.go	Updates workflow spec parsing expectation for github/gh-aw-trial blob URL.
pkg/cli/spec_github_url_test.go	Updates GitHub URL parsing expectations for migrated github/... repos.
pkg/cli/git_helpers_test.go	Updates repo slug parsing expectations for HTTPS URLs pointing at github/gh-aw.

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