fix: close ignite ecosystem bridge follow-ups

[0xjcf]

Summary

• split the headless runtime host type to use EventTarget without HTMLElement casting
• tighten igniteTools scalar provider envelopes and clarify canExecute manifest refresh wording
• update ActorWebAdapter command-source warnings to refer to command-capable sources
• defer ActorWebAddress collapse until @actor-web/runtime publishes the branded string address and this repo bumps the dependency

Verification

• pnpm --filter ignite-element exec vitest --run src/tests/tools.scalar.test.ts src/tests/tools.anthropic.test.ts src/tests/tools.test.ts
• pnpm --filter ignite-element exec vitest --run src/tests/adapters/ActorWebAdapter.test.ts
• pnpm --filter @ignite-element/adapters typecheck
• fas validate-task per completed task
• .fas/scripts/verify.sh --full
• coderabbit review --agent -t committed --base beta -c AGENTS.md: 0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.27%. Comparing base (15aa09e) to head (9e12bdd).
⚠️ Report is 1 commits behind head on beta.

Additional details and impacted files

@@            Coverage Diff             @@
##             beta      #83      +/-   ##
==========================================
+ Coverage   90.26%   90.27%   +0.01%     
==========================================
  Files          32       32              
  Lines        1571     1573       +2     
  Branches      444      447       +3     
==========================================
+ Hits         1418     1420       +2     
  Misses        143      143              
  Partials       10       10              

Flag	Coverage Δ
unittests	90.27% <100.00%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...ackages/ignite-element/src/IgniteElementFactory.ts	97.20% <100.00%> (ø)
...kages/ignite-element/src/createComponentFactory.ts	91.66% <100.00%> (+0.36%)	⬆️
...ages/ignite-element/src/createProjectionFactory.ts	96.15% <ø> (ø)
packages/ignite-element/src/runtime/agent.ts	95.65% <ø> (ø)
packages/ignite-element/src/tools/igniteTools.ts	100.00% <ø> (ø)
packages/ignite-element/src/tools/scalar.ts	100.00% <100.00%> (ø)

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