test: adopt object-form igniteTest command steps

[0xjcf]

Summary

• replace positional igniteTest.when(name, input?) with object-form when({ name, input? }) during the v3 beta window
• preserve discriminated command typing for required, optional, and no-input commands without changing runtime or story execute APIs
• migrate the testing documentation and README examples to the current DSL

Verification

• .fas/scripts/verify.sh --full
• coderabbit review --agent -t committed --base beta -c AGENTS.md (0 findings)
• push hook: 51 test files, 627 tests passed

Notes

• no changeset or package version change; release metadata remains owned by the v3 release task
• no migrations or deployment monitoring required

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fas/object-form-ignitetest-command-steps

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[codecov]

Codecov Report

❌ Patch coverage is 94.23077% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.07%. Comparing base (2f86faa) to head (2e7aacc).
⚠️ Report is 19 commits behind head on beta.

Files with missing lines	Patch %	Lines
packages/ignite-element/src/tools/igniteTools.ts	86.36%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             beta      #93      +/-   ##
==========================================
- Coverage   91.25%   90.07%   -1.19%     
==========================================
  Files          33       38       +5     
  Lines        1830     3093    +1263     
  Branches      498      926     +428     
==========================================
+ Hits         1670     2786    +1116     
- Misses        150      285     +135     
- Partials       10       22      +12     

Flag	Coverage Δ
unittests	90.07% <94.23%> (-1.19%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/ignite-element/src/runtime/agent.ts	91.48% <100.00%> (-3.46%)	⬇️
packages/ignite-element/src/testing.ts	74.34% <100.00%> (-0.10%)	⬇️
packages/ignite-element/src/tools/core.ts	96.00% <100.00%> (+2.48%)	⬆️
packages/ignite-element/src/xstate.ts	100.00% <ø> (ø)
packages/ignite-element/src/tools/igniteTools.ts	95.58% <86.36%> (-4.42%)	⬇️

... and 1 file with indirect coverage changes

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