audit: skip status:unsupported DEs + relocate audit scripts

[igorpecovnik]

Summary

Two related changes to the desktop matrix audit, kept in one commit because the script move and the new behaviour land together.

1. Skip `status: unsupported` DEs by default

The weekly audit (#824) was running against every YAML in `tools/modules/desktops/yaml/` — including the four flagged `status: unsupported`:

DE	Why it's unsupported
`bianbu`	SpacemiT riscv64 only, custom Bianbu archive
`kde-neon`	Ubuntu noble/plucky only, custom KDE Neon repo
`budgie`	community-maintained, mostly Ubuntu LTS
`deepin`	community-maintained, sporadic distro coverage

Auditing them generates noise that isn't actionable: 'package not in the upstream archive' is the expected state for many of their (release, arch) combinations because the YAML doesn't intend to ship those combinations to begin with. The Claude apply step would then propose `tier_overrides` for combos nobody actually intends to install.

Filter them at the YAML enumeration step: read each file's `status:` field, skip `unsupported` by default. The list of skipped DEs is added to the JSON report and surfaced in the workflow's job summary so reviewers can see at a glance which DEs were excluded.

A new `--include-unsupported` CLI flag re-enables them for the rare case where someone wants to audit one before promoting it to `status: supported`.

Verified locally:

• default run: audits 8 (cinnamon, enlightenment, gnome, i3-wm, kde-plasma, mate, xfce, xmonad), skips 4 (bianbu, budgie, deepin, kde-neon)
• `--include-unsupported`: audits all 12 as before

2. Relocate the audit scripts

Move the two scripts from `tools/desktops/` to `tools/modules/desktops/github/` so all desktop-related code lives under `tools/modules/desktops/`. The `github/` subdir makes the intent clear (these are CI helpers, not runtime modules) and parallels the `.github/workflows/` layout.

```
tools/desktops/audit.py -> tools/modules/desktops/github/audit.py
tools/desktops/audit_apply.py -> tools/modules/desktops/github/audit_apply.py
```

The workflow's two python3 invocations and the `audit_apply.py` prompt template are updated to point at the new paths. The scripts themselves are unchanged on the move (only the path strings update). The empty `tools/desktops/` directory is removed.

Test plan

• `python3 tools/modules/desktops/github/audit.py --build-repo ../build --configng-repo . --skip-network` runs cleanly from the new path, audits 8 DEs, skips 4
• `--include-unsupported` audits all 12
• Workflow YAML still validates
• Trigger `.github/workflows/maintenance-desktop-audit.yml` manually with `dry_run=true` once this lands to verify the new path works in CI

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f980faa7-856c-4c6c-96bf-4484044b2e49

📥 Commits

Reviewing files that changed from the base of the PR and between e618912 and 22d067b.

📒 Files selected for processing (3)

• .github/workflows/maintenance-desktop-audit.yml
• tools/modules/desktops/github/audit.py
• tools/modules/desktops/github/audit_apply.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch audit-exclude-unsupported-des

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