fix: expose system task prompts as bundle artifacts

[chubes4]

Summary

• Exposes registered system task prompt definitions as versioned prompts/system-tasks/...json bundle artifacts during export.
• Preserves prompt artifact files through array bundle import/export and includes them in upgrade planning with stable artifact IDs.
• Adds a shared installed system-task prompt artifact store so runtime resolution can use installed artifact defaults while local overrides remain untouched and are reported as locally modified.

Tests

• php tests/prompt-auth-template-artifacts-smoke.php
• php tests/agent-bundle-format-smoke.php
• php tests/datamachine-package-artifacts-smoke.php
• vendor/bin/phpcs inc/Engine/AI/System/SystemTaskPromptRegistry.php inc/Core/Agents/AgentBundler.php inc/Engine/Bundle/AgentBundleArrayAdapter.php inc/Engine/Bundle/AgentBundleUpgradePlanner.php inc/Cli/Commands/AgentBundleCommand.php tests/prompt-auth-template-artifacts-smoke.php

Notes

• php tests/agent-bundle-upgrade-planner-smoke.php currently fatals before exercising this change because the smoke stubs AgentsAPI\\Core\\Workspace\\WP_Agent_Workspace_Scope and then Composer autoload loads the same class from vendor/automattic/agents-api.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: implementing and testing the focused Externalize AI system task prompts into versioned artifacts #1536 system prompt artifact slice; Chris remains responsible for review.

Fixes #1536

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since 9caa8a9

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/26334629745

Test

✅ test — passed

ℹ️ Auto-fix lint issues: homeboy refactor data-machine --from lint --write
ℹ️ Collect coverage: homeboy test data-machine --coverage
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine --changed-since 9caa8a9

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/26334629745

Audit

✅ audit — passed

• requested_detectors — 46 finding(s)
• intra-method-duplication — 17 finding(s)
• dead_code — 10 finding(s)
• parallel-implementation — 4 finding(s)
• Api — 1 finding(s)
• Directives — 1 finding(s)
• Retention — 1 finding(s)
• repeated_literal_shape — 1 finding(s)
• structural — 1 finding(s)
• Total: 82 finding(s)

Deep dive: homeboy audit data-machine --changed-since 9caa8a9

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/26334629745

Tooling versions

• Homeboy CLI: homeboy 0.197.2+e48590b4
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: dd23ee80
• Action: unknown@unknown

[chubes4]

CI follow-up pushed in e48590b.

Verified after Homeboy autofix:

• homeboy lint --path /Users/chubes/Developer/data-machine@issue-1536-system-task-prompts --extension wordpress --changed-since 9caa8a97d5f139b550888f99189db1798dd06cc0
• php tests/prompt-auth-template-artifacts-smoke.php
• php tests/agent-bundle-format-smoke.php
• php tests/datamachine-package-artifacts-smoke.php