Remove generic CLI channel runtime

[chubes4]

Summary

• Remove Data Machine Code's generic CLI dispatch runtime for agents/dispatch-message now that the local CLI channel transport lives in wp-coding-agents.
• Drop the DMC-only CliChannelRegistry / CliChannelTransport classes, bootstrap registration, and dedicated smoke test for that generic runtime.
• Leave DMC workspace, GitHub, GitSync, worktree, and WordPress runtime functionality untouched.

Fixes #516.
Related: Extra-Chill/wp-coding-agents#178, #412.

Verification

• homeboy test --path /Users/chubes/Developer/data-machine-code@fix-issue-516-remove-cli-channel-runtime passed, but host-smoke reported no matching tests/**/*-smoke.php files for this repo naming pattern.
• homeboy lint --path /Users/chubes/Developer/data-machine-code@fix-issue-516-remove-cli-channel-runtime --changed-only passed with no findings.
• php -l data-machine-code.php passed.
• php tests/smoke-worktree-handles.php && php tests/smoke-tool-schemas.php && php tests/smoke-late-ability-registration.php && php tests/smoke-deferred-ability-registration.php passed.

Notes

• Full homeboy lint --path /Users/chubes/Developer/data-machine-code@fix-issue-516-remove-cli-channel-runtime still reports existing unrelated PHPStan findings across workspace files; PHPCS and ESLint passed during that run.
• docs/CHANGELOG.md still has historical release text mentioning the runtime; it was not edited because the changelog is release-generated.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (openai/gpt-5.5)
• Used for: Removed the DMC-owned generic CLI runtime and smoke coverage, ran validation, and drafted this PR description for Chris to review.

[homeboy-ci]

Homeboy Results — data-machine-code

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
ℹ️ Save lint baseline: homeboy lint data-machine-code --baseline
Deep dive: homeboy lint data-machine-code --changed-since 8932818

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-lint-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-lint-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/26795005054

Test

✅ test — passed

ℹ️ No impacted tests found for --changed-since 8932818
ℹ️ Run full suite if needed: homeboy test data-machine-code
Deep dive: homeboy test data-machine-code --changed-since 8932818

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-test-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-test-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/26795005054

Audit

✅ audit — passed

Deep dive: homeboy audit data-machine-code --changed-since 8932818

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-audit-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-audit-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/26795005054

Tooling versions

• Homeboy CLI: homeboy 0.218.0+78630a8
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 5eb10bf6
• Action: unknown@unknown