Remove child handle result APIs

[KyleAMathews]

Motivation

This removes the old child-handle result pattern where a parent could spawn/observe a child and then await entity.run / call entity.text() in the same handler invocation.

We want child coordination to happen via durable server wakes instead:

• a parent spawns or observes a child with wake: { on: "runFinished", includeResponse: true }
• the parent handler returns and can be shut down safely
• when the child finishes, the server wakes the parent again with wake.payload.finished_child

Keeping an agent paused while it waits for child output is risky in serverless/function runtimes: the process may be suspended or shut down at any time. It also ties up the parent invocation and prevents the parent from returning to the runtime to handle other work. Durable wakes make child completion an explicit continuation point instead of an in-memory promise.

Summary

• remove EntityHandle.run / EntityHandle.text() from the public runtime types
• remove internal spawn resolveRun / rejectRun plumbing
• update orchestration tests to continue from runFinished wake payloads instead of same-wake child output reads
• update docs, skills, examples, and tests so response-producing child coordination uses:
  • initialMessage to start child work
  • wake: { on: "runFinished", includeResponse: true } to receive the result later
  • wake.payload.finished_child.response as the durable child response

Notes

• shorthand wake support (wake: "runFinished") remains in the runtime type for compatibility
• this PR removes shorthand usages from docs/examples/tests where a child response is needed, so examples consistently opt into includeResponse

Verification

• pnpm --filter @electric-ax/agents-runtime typecheck
• targeted runtime-dsl F1-F10 tests were run individually and printed passing results; Vitest often left worker processes alive after pass output in this worktree
• audit search found no remaining shorthand wake: "runFinished" usages and no real removed child handle API references

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.66%. Comparing base (b0030a1) to head (ddfb05b).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4517       +/-   ##
===========================================
- Coverage   69.32%   55.66%   -13.66%     
===========================================
  Files          77      300      +223     
  Lines        9277    33945    +24668     
  Branches     2896     9641     +6745     
===========================================
+ Hits         6431    18897    +12466     
- Misses       2828    15029    +12201     
- Partials       18       19        +1     

Flag	Coverage Δ
packages/agents	71.78% <ø> (ø)
packages/agents-mobile	84.09% <ø> (?)
packages/agents-runtime	80.96% <100.00%> (?)
packages/agents-server	72.79% <ø> (-0.02%)	⬇️
packages/agents-server-ui	5.77% <ø> (?)
packages/electric-ax	46.42% <ø> (ø)
typescript	55.66% <100.00%> (-13.66%)	⬇️
unit-tests	55.66% <100.00%> (-13.66%)	⬇️

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