Add runner workspace command ability

[chubes4]

Summary

• Adds the canonical datamachine-code/run-runner-workspace-command backend ability so WP Codebox can delegate runner workspace verification/drift commands without knowing DMC local paths.
• Runs bounded local workspace commands with typed stdout/stderr, exit code, elapsed time, backend/workspace metadata, and non-zero command results instead of throwing path assumptions at callers.
• Returns typed unavailable metadata for GitHub API remote workspaces where shell command execution is not available.

Coordination

• Closes Expose runner workspace command backend ability #628.
• Coordinates with Expose runner workspace capture and command APIs Automattic/wp-codebox#878, which exposes wp-codebox/run-runner-workspace-command as the product-level boundary.
• Unblocks Run verification commands through WP Codebox runner workspace boundary homeboy-extensions#1259 by giving WP Codebox a DMC backend for runner workspace command delegation.

Tests

• php tests/smoke-runner-workspace-command.php
• php tests/smoke-ability-tool-projections.php
• php tests/smoke-runner-workspace-publication.php
• php tests/smoke-remote-workspace-backend.php
• php tests/smoke-worktree-bootstrap.php
• php -l inc/Support/ProcessRunner.php && php -l inc/Workspace/WorkspaceGitOperations.php && php -l tests/smoke-runner-workspace-command.php
• php -l inc/Abilities/WorkspaceAbilities.php && php -l inc/Workspace/RemoteWorkspaceBackend.php && php -l inc/Tools/WorkspaceTools.php && php -l inc/Tools/AbilityToolProjections.php && php -l tests/smoke-ability-tool-projections.php

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Implemented the backend ability, smoke coverage, targeted verification, and PR drafting under Chris's direction.

[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 e061c59

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/27372950357

Test

✅ test — passed

ℹ️ Auto-fix lint issues: homeboy refactor data-machine-code --from lint --write
ℹ️ Collect coverage: homeboy test data-machine-code --coverage
ℹ️ Save test baseline: homeboy test data-machine-code --baseline
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine-code --changed-since e061c59

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/27372950357

Audit

✅ audit — passed

• audit — 32 finding(s)
• Total: 32 finding(s)

Deep dive: homeboy audit data-machine-code --changed-since e061c59

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/27372950357

Tooling versions

• Homeboy CLI: homeboy 0.228.11+0690275
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 9d0006dc
• Action: unknown@unknown