feat(trajectory): moves along its shape with the body, not at a constant speed (0.9.0)

[PPierzc]

Holding the trajectory to a constant speed along a line or arc left each stride's speed-up and slow-down in the pose. Played in place, the body floated forward and back: 13 cm on a run.

• The shape (still / line / arc / bezier) is chosen by how well it fits across the travel path.
• Along the shape, the trajectory follows the body's COM, projected onto a guide that runs on past the shape's ends. A line runs on straight, an arc on round, a Bezier straight from its ends.
• Lines are fitted by their principal direction, so a stop-and-turn-back take goes out and back along one line.
• Breaking change to the wire format: the + distance curve models are gone. params gains speed_range and drops key_times_s and distance_keys_m. Docs updated.

Tests: test_in_place_the_body_does_not_float_forward_and_back; the ramp test now checks that the speed varies. All 100 tests pass.

Measured in Blender with the same method in the addon (COM float along the facing, in place): run 13.5 → 2.1 cm, curving walk 3.5 → 1.4 cm, loop 3.1 → 0.7 cm.

Version bumped to 0.9.0, not tagged yet.

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between c26042f and 27c6e0f.

📒 Files selected for processing (5)

• docs/docs/reference/response.mdx
• pyproject.toml
• src/motionmcp/__init__.py
• src/motionmcp/trajectory.py
• tests/test_trajectory.py

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