Fix cleanup metadata compact samples

[chubes4]

Summary

• Keep compact JSON samples.removed reserved for actual removal arrays.
• Show non-destructive metadata promotion rows under samples.planned and samples.written.
• Add regression coverage for active/no-signal metadata promotion compact output.

Closes #821

Tests

• php tests/workspace-compact-output.php
• php tests/smoke-abandoned-cleanup-orchestrator.php
• php tests/smoke-cleanup-eligible-drain.php
• php -l inc/Cli/WorkspaceCompactOutput.php
• php -l tests/workspace-compact-output.php

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 and OpenCode
• Used for: Implementing the compact output terminology fix, adding focused regression coverage, and running verification.

[homeboy-ci]

Homeboy Results — data-machine-code

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine-code --changed-since 4d5c2fa

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/28274431469

Tooling versions

• Homeboy CLI: homeboy 0.263.0+7f3ee0f12635+34e8b19
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 927a6952
• Action: unknown@unknown