feat(kida,store): move tasks from @nano_kit/store to kida

[dangreen]

The tasks pool and runner move down the chain: tasks.ts and its spec travel to kida as-is, kida exports them from its index, and @nano_kit/store keeps handing them out unchanged through its existing export * from 'kida' — nothing changes for consumers. hydration.ts now takes TasksPool$ and waitTasks from kida directly.

Size pins move with the code: kida 4.8 → 4.95 kB gzip (4.4 → 4.55 brotli), store 5.8 → 5.85 kB brotli.

Lint, tsc --noEmit, 66 kida and 55 store tests are green.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.40%. Comparing base (1065b20) to head (4197b21).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #220   +/-   ##
=======================================
  Coverage   85.40%   85.40%           
=======================================
  Files         142      142           
  Lines        3180     3180           
  Branches      595      595           
=======================================
  Hits         2716     2716           
  Misses        335      335           
  Partials      129      129           

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