Add async runtime tool broker

[chubes4]

Summary

• Adds an async runtime-tool broker path for client tools that cannot return inline: the run pauses, a pending runtime-tool job is persisted, and chat metadata exposes the pending request.
• Adds Action Scheduler hooks for timeout and resume: submitted client results append a normal tool-result message, enqueue chat continuation, and complete the runtime-tool job.
• Keeps inline callback fulfillment as the fast path while using Data Machine jobs for durable pending state.

Scope

This PR builds on #2206. The broker is intentionally chat-resume focused because chat sessions already own pending-tool continuation semantics; pipeline-specific pause/resume can be layered later if a pipeline transport needs client runtime tools.

Closes #2205.
Refs #1485.

Tests

• php -l inc/Engine/AI/conversation-loop.php
• php -l inc/Api/Chat/ChatOrchestrator.php
• php -l tests/runtime-tool-async-broker-smoke.php
• php tests/runtime-tool-async-broker-smoke.php
• php tests/agent-conversation-runner-request-smoke.php
• php tests/tool-source-registry-smoke.php
• git diff --check origin/main...HEAD

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Implemented the async runtime tool broker path and smoke coverage; Chris remains responsible for review and merge.

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since 2043b33

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-lint-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-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/actions/runs/26338456476

Test

✅ test — passed

• 120 passed
• 3 skipped

ℹ️ Auto-fix lint issues: homeboy refactor data-machine --from lint --write
ℹ️ Collect coverage: homeboy test data-machine --coverage
ℹ️ Save test baseline: homeboy test data-machine --baseline
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine --changed-since 2043b33

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-test-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-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/actions/runs/26338456476

Audit

✅ audit — passed

• requested_detectors — 9 finding(s)
• intra-method-duplication — 7 finding(s)
• dead_code — 4 finding(s)
• dead_guard — 3 finding(s)
• structural — 2 finding(s)
• Directives — 1 finding(s)
• Retention — 1 finding(s)
• Total: 27 finding(s)

Deep dive: homeboy audit data-machine --changed-since 2043b33

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-audit-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-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/actions/runs/26338456476

Tooling versions

• Homeboy CLI: homeboy 0.197.2+c798b5ec
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: dd23ee80
• Action: unknown@unknown