Make AI movement clamping expansion-aware for frontier objectives

[AaronKow]

Motivation

• Prevent the agent from being clipped back into the base 100×100 map when the world has been expanded so frontier/external tiles remain reachable.
• Preserve existing safety: reject non-finite inputs and block absurd teleports while allowing movement beyond base-map limits for valid expansion tiles.
• Ensure move → expand_map objective flow still works from reachable frontier positions.

Description

• Replace hardcoded clamp x = max(1, min(99, x)) / z = max(1, min(99, z)) with expansion-aware bounds derived from client.world_size and get_world_state_snapshot() expansionTiles, adding a small margin MOVE_BOUNDS_EXPANSION_MARGIN.
• Add _safe_move_scalar(value, fallback) to sanitize non-finite/invalid coordinates and _movement_bounds() to compute dynamic (min_x, max_x, min_z, max_z) from snapshot + base world size.
• Add MOVE_MAX_ABSURD_DELTA guard to prevent absurd teleport deltas and clamp movement deltas to a safe maximum instead of forcing movement back into the base map.
• Update _execute() move branch to use the new sanitization, expansion-aware bounds, and absurd-delta guard; keep rotation calculation consistent with sanitized origin.
• Extend tests in client-sdk-python/tests/test_ai_agent_timing.py (and adapt DummyClient) to cover frontier coordinates preservation, move→expand_map flow from frontier positions, and sanitization of non-finite inputs.

Testing

• Ran pytest client-sdk-python/tests/test_ai_agent_timing.py client-sdk-python/tests/test_openbot_client.py -q; both test modules passed locally.
• Test results: 16 passed (all tests in the two modules succeeded).
• Unit tests added/updated: expansion-frontier move preservation, move then expand_map frontier flow, and non-finite coordinate sanitization in client-sdk-python/tests/test_ai_agent_timing.py.

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Codex Task

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