feat: no_alloc version

[SeaRoll]

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[Copilot]

Pull request overview

This PR refactors the ATO async runtime to eliminate heap allocation requirements, making it truly no_alloc compatible. The core change replaces boxed, heap-allocated futures with stack-pinned futures using lifetimes and introduces a task! macro for ergonomic stack pinning.

Key changes:

• Removed alloc dependency and converted Spawner to use stack-pinned futures with lifetime parameters
• Introduced task! macro to simplify creation of stack-pinned async blocks
• Refactored sleep and yield_now into separate modules for better code organization

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/lib.rs	Removed alloc dependency, added lifetime parameter to Spawner, introduced task! macro, moved sleep/yield_now to separate modules
src/sleep.rs	Extracted DurationSleep future and sleep function into dedicated module
src/yield_now.rs	Extracted YieldNow future and yield_now function into dedicated module
examples/simple.rs	Updated to use new stack-pinned task API with task! macro
examples/time.rs	Updated to use new stack-pinned task API and changed from static to local spawner
examples/yield.rs	Updated to use new stack-pinned task API with named task variables
README.md	Updated documentation to reflect no_alloc capability and simplified usage example

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