Add joy axis input map binding

[Clubhouse1661]

Summary

Fixes #465 by adding support for binding joystick axis events through input_map_manage(op=bind_event).

• Add event_type=joy_axis support in the GDScript input handler by creating InputEventJoypadMotion.
• Require axis and accept optional axis_value (default 1.0).
• Update MCP tool docs to advertise joy_axis alongside key, mouse button, and joy button bindings.
• Add GDScript coverage for missing axis and successful axis binding.

Verification

• Red check before implementation: focused input suite failed on test_bind_joy_axis_event because joy_axis returned an error instead of data.
• test_run suite=input: 22/22 passed, 0 failed.
• python -m ruff check src/godot_ai/tools/input_map.py: passed.
• git diff --check: passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR addresses #465 by extending the InputMap MCP “bind_event” pathway to support joystick axis bindings (event_type="joy_axis") in the Godot-side input handler, along with docs and tests. From code inspection, input_map_manage(op=list) already serializes both joy button and joy axis events (and user-authored/custom actions persisted in project.godot), so the prior “read dropped joy events / custom actions” report is likely due to filtering (include_builtin=false) or the project lacking persisted [input] entries rather than missing serialization.

Changes:

• Add joy_axis handling to InputHandler._create_event() by creating InputEventJoypadMotion and requiring axis (with optional axis_value defaulting to 1.0).
• Update the MCP tool description to document joy_axis bindings and parameters.
• Add GDScript tests covering missing axis validation and successful joy_axis binding/serialization.

Reviewed changes

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

File	Description
plugin/addons/godot_ai/handlers/input_handler.gd	Adds joy_axis event creation and updates unsupported-type messaging.
src/godot_ai/tools/input_map.py	Documents joy_axis support and new parameters for bind_event.
test_project/tests/test_input.gd	Adds tests for missing axis and successful joy-axis binding.

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