feat(agera,kida,nanoviews): bottom-up deferred effect scopes

[dangreen]

Redesign of the deferred-effect-scope mechanism: view effects now start bottom-up (children before parents) and are destroyed children-first, while store effects keep their current behavior.

• rework the defer layer into a LazyMode one-shot token state machine (LAZY -> STARTED -> STOPPED): two-pass start runs children before parents, stop is total and children-first, moveScope is removed
• boundDeferScope anchors pin the swap position structurally; swaps destroy the previous content first, while its DOM is still attached
• for_ owns its rows: free-standing row scopes are started and stopped in visual order via the items list; an eager teardown holder guarantees row cleanup even for periods stopped before their first start
• kida unsafeRun switches the DI context without untracking; mount/unmount are batched, so the DI context and render writes never leak into the flush
• fix zombie effects after mid-start teardown, a checkDirty crash on emptied pending scopes, stuck mounted(true) on discarded subscriptions and incomplete cleanup of effects disposed during their own warmup

Verified with the full test chain (agera 113, kida 61, nanoviews 72, store 57), size-limit across all packages and a real-browser benchmark at parity.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 94.64286% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.23%. Comparing base (468a293) to head (02a7655).

Files with missing lines	Patch %	Lines
packages/nanoviews/src/internals/flow/loop.ts	92.50%	1 Missing and 2 partials ⚠️
packages/agera/src/internals/system.ts	96.66%	1 Missing and 1 partial ⚠️
packages/nanoviews/src/component/context.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
+ Coverage   83.96%   84.23%   +0.26%     
==========================================
  Files         138      138              
  Lines        2988     3026      +38     
  Branches      564      565       +1     
==========================================
+ Hits         2509     2549      +40     
+ Misses        340      339       -1     
+ Partials      139      138       -1     

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