refactor: simplify dev workflow for testing agent assigment

[mnkiefer]

• Switched from using Octokit to getOctokit for performing GraphQL mutations in both the main and fallback agent assignment logic.
• Added enhanced logging for mutation operations, including token usage and mutation details, to aid debugging and auditability.

[Copilot]

Pull request overview

This PR simplifies the dev workflow by replacing a complex discussion-closing workflow with a simpler agent assignment workflow. The change reduces the workflow from ~350 lines to ~10 lines in the markdown file and significantly simplifies the compiled YAML.

Key changes:

• Replaces close_discussion safe output with assign_to_agent safe output
• Removes extensive threat detection logic (Ollama/Llama Guard 3 scanning)
• Removes custom Serena MCP tool configuration
• Simplifies bash tool configuration to wildcard access
• Updates permissions and job dependencies to match new functionality

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/dev.md	Simplified workflow definition: removed concurrency config, threat detection, discussion closing logic; added wildcard bash tools and assign-to-agent safe output
.github/workflows/dev.lock.yml	Compiled YAML reflecting simplified workflow: removed Ollama threat scanning steps, Go/Python/uv setup, Serena MCP server, discussion closing job; added agent assignment job with GraphQL mutations and permission handling

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[mnkiefer]

@copilot Analyze https://github.com/githubnext/gh-aw/actions/runs/19675058618/job/56353957110 and fix the issue in assign-to-agent.cjs. For the graphql call that uses octokit with a new token GH_AW_AGENT_TOKEN which has the required permissions. Add more logging if needed.

[Copilot]

@mnkiefer I've opened a new pull request, #4757, to work on those changes. Once the pull request is ready, I'll request review from you.