BREAKING(async/unstable): change Lazy.peek() return type, add AbortSignal support

[tomas-zijdemans]

• AbortSignal support added to get()

• Fixed a subtle bug where get() silently swallowed rejections by attaching a handler directly to the returned promise, suppressing unhandledrejection for uncaught callers.
• peek() now returns  a discriminated union matching the Channel.tryReceive() convention. This resolves the type-level ambiguity when T includes undefined.

• Error-reset semantic documented 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.42%. Comparing base (224adef) to head (698a40b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7084   +/-   ##
=======================================
  Coverage   94.42%   94.42%           
=======================================
  Files         630      630           
  Lines       50533    50552   +19     
  Branches     8964     8969    +5     
=======================================
+ Hits        47717    47735   +18     
  Misses       2247     2247           
- Partials      569      570    +1     

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[bartlomieju]

Thanks!