Add test plan agent

[jpangas]

This pull request introduces a new "test-plan-generator" agent that automatically generates and executes Firefox QA test plans based on feature details.

[Copilot]

Pull request overview

This PR adds a new Hackbot agent, test-plan-generator, wired into the Hackbot API registry and local docker-compose workflow, to generate a Firefox QA test plan from feature details, execute it via the Firefox DevTools MCP server, and return a structured pass/fail/unsuitable result.

Changes:

• Registers a new test-plan-generator agent in hackbot-api with a dedicated input schema and associated tests.
• Introduces a new agent package under agents/test-plan-generator/ including prompts, result schema/collector MCP server, Firefox install helper, DevTools MCP wiring, Dockerfile, and compose service.
• Updates workspace/dependency lock and root compose include to build/run the new agent.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
uv.lock	Adds the new agent package as a workspace member with its dependencies.
services/hackbot-api/tests/test_agents.py	Adds tests for the new input schema, env serialization, and registry entry.
services/hackbot-api/app/schemas.py	Adds TestPlanGeneratorInputs for the new agent’s API contract.
services/hackbot-api/app/agents.py	Registers the new agent in AGENT_REGISTRY and exposes it via the API.
docker-compose.yml	Includes the agent’s compose file for local runs.
agents/test-plan-generator/pyproject.toml	Declares the agent distribution and its runtime dependencies.
agents/test-plan-generator/hackbot.toml	Documents that this agent downloads Firefox at startup (no platform prep needed).
agents/test-plan-generator/hackbot_agents/test_plan_generator/result.py	Defines structured result models and an in-process MCP submit_result tool.
agents/test-plan-generator/hackbot_agents/test_plan_generator/prompts/system.md	Adds the system prompt governing generation/execution/reporting rules.
agents/test-plan-generator/hackbot_agents/test_plan_generator/firefox_install.py	Implements Nightly download/install at agent startup.
agents/test-plan-generator/hackbot_agents/test_plan_generator/devtools_mcp.py	Builds the stdio MCP server config for the Firefox DevTools MCP server.
agents/test-plan-generator/hackbot_agents/test_plan_generator/config.py	Defines the allowed DevTools MCP tool allowlist for execution.
agents/test-plan-generator/hackbot_agents/test_plan_generator/agent.py	Orchestrates MCP servers, prompts, and result collection for the run.
agents/test-plan-generator/hackbot_agents/test_plan_generator/__main__.py	Reads env inputs and runs the agent entrypoint, installing Firefox first.
agents/test-plan-generator/hackbot_agents/test_plan_generator/__init__.py	Declares the agent subpackage.
agents/test-plan-generator/Dockerfile	Builds the agent image with Python deps, Node/npm, and required Firefox libs.
agents/test-plan-generator/compose.yml	Adds a local compose service for running the agent with env wiring.

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[jpangas]

The lint check is failing for a file that is untouched in this PR. When I committed on my side, everything passed. Should I commit the fix it's recommending?