feat: add child reconciliation with key-based diffing

[MarcelOlsen]

Add reconcileChildFibers and mountChildFibers implementing the
two-pass key-based diffing algorithm for efficient child updates.

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[MarcelOlsen]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• test: update test suite for fiber architecture #47
• feat: switch public API to fiber architecture #46
• feat: add SSR hydration and resumability support #45
• feat: add work loop and fiber module index #44
• feat: update event system for fiber architecture #43
• feat: add commit phase (commitWork + commitRoot) #42
• feat: add render phase (beginWork + completeWork) #41
• feat: add fiber-based hook implementations #40
• feat: add child reconciliation with key-based diffing #39 👈 (View in Graphite)
• feat: add fiber tree utilities and effect system #38
• feat: add fiber factory functions #37
• feat: add fiber scheduler and work-in-progress tree management #36
• feat: add lane-based priority system #35
• feat: add fiber type guards and assertion utilities #34
• feat: add fiber type definitions and update core types #33
• chore: remove example app and update configs #32
• master

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