Multiple concurrent world support - #42
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Remove single-world assertions from init/fini. Always register components via ecs_component_init even when global already set, updating the global to the latest ID. Add shutdown() for explicit process-exit cleanup of the global component ID map and allocator. Add multi_world_test.zig with 8 test cases covering concurrent world lifecycle and component ID isolation.
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Remove the single-world restriction. Alternative to PR #31: component IDs are shared globally and assigned deterministically via use_low_id. Both COMPONENT and TAG call into the C library in every world, updating the shared global.
Tradeoffs vs per-world maps:
Adds deinit() for explicit process-lifetime cleanup. Guard assertions for low-ID exhaustion and registration order mismatch. 7 multi-world tests.