docs: repo-wide housekeeping — sync README & docs with the code as shipped

Six parallel audits swept the root docs, docs-site, every per-directory
README, and the packaging docs; every claim below was verified against
the source before editing.

- README: Layout gains the six missing crates (pf-client-core,
  pf-presenter, pf-console-ui, pf-ffvk, pf-driver-proto, punktfunk-tray),
  clients/session, api/ and ci/; Linux/Windows client rows reflect the
  shell + Vulkan-session split and the Vulkan Video -> VAAPI/D3D11VA ->
  software decode chains; the "every client over a C ABI" claim is
  corrected (Rust clients link the core directly); tiered stats overlay
  + console shell noted; Apple row mentions AV1.
- CONTRIBUTING: drop the dead CLAUDE.md link (deliberately untracked);
  point at the README's build/invariants sections. SECURITY: 0.9.0.
- host-cli/pairing: --allow-pairing/--require-pairing are no-op legacy
  names — pairing is required by default, --allow-tofu is the real flag;
  document --data-port and --idle-timeout-ms.
- configuration: document PUNKTFUNK_RECOVER_SESSION_CMD (session-crash
  recovery hook), PUNKTFUNK_MDNS, PUNKTFUNK_DATA_PORT.
- virtual-displays/gnome: GNOME per-client scaling shipped (host-
  persisted) — flip the ❌ to ✅ and describe how it works.
- stats: new "Detail levels" section (Off/Compact/Normal/Detailed +
  per-platform cycle gestures); retire the GTK hand-off note.
- clients/install-client/status/roadmap: decode chains, Windows client
  validation narrowed to HDR-only pending, adaptive bitrate, console
  shell, Apple AV1, Windows host vendor list.
- Sub-READMEs: clients/linux rewritten for the re-architecture; session
  Windows decode rung + d3d11va knob; Windows tiered overlay; Android
  minSdk 28; decky file table; host zerocopy/ path; scripts port
  47992 and steamos-host.md; pf-dualsense source path.
- packaging: canary version bases are tag-derived (<next-minor> via
  pf-version.sh/.ps1), codecs-extra not ffmpeg-full, document the
  pinned offline-Skia tarball + SKIA_BINARIES_URL and vulkan-headers.
- Convert 15 dangling design/*.md links to the punktfunk-planning
  prose convention (those docs live in the private planning repo).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs-site/content/docs/virtual-displays.md

@@ -19,9 +19,9 @@ opened on.
 > you also use in person, or a multi-monitor workstation.
 
 > **What's live today:** **keep-alive** (linger, or **forever**), **topology** (extend / primary /
-> exclusive), **conflict handling**, **per-client identity + persistent scaling** (Windows *and*
-> KDE/KWin), and **multi-monitor layout** (several clients as monitors of one desktop) are all
-> enforced. A reconnect always resumes the kept display — even a fast one — instead of spawning a
+> exclusive), **conflict handling**, **per-client identity + persistent scaling** (Windows, KDE/KWin
+> *and* GNOME/Mutter), and **multi-monitor layout** (several clients as monitors of one desktop) are
+> all enforced. A reconnect always resumes the kept display — even a fast one — instead of spawning a
 > second. The remaining gaps are noted inline: the Linux `primary` physical-keep *effect*, Sway
 > `exclusive`, and multi-display for a *single* client (that last is the next stage).
 
@@ -153,7 +153,7 @@ client a *stable display identity*, so your desktop environment keys its per-mon
 |---|---|---|
 | **Windows** | ✅ today | Connect, set scaling in Settings while streaming — Windows remembers it per client. |
 | **KDE / KWin** | ✅ today | Set scaling in System Settings while streaming; KWin keys it to a stable per-client output name and reapplies it on reconnect. Validated live (150 %/125 % survive a full disconnect + reconnect). |
-| **GNOME / Mutter** | ❌ | GNOME's virtual-monitor API exposes no stable identity to key config on. |
+| **GNOME / Mutter** | ✅ today | GNOME's virtual-monitor API exposes no stable identity to key config on, so the **host persists the scale itself**: set scaling in Settings while streaming — the host captures the change, remembers it per client, and reapplies it on reconnect. |
 | **Sway / wlroots** | ❌ | Headless outputs can't carry a stable identity; pin scale in your sway config instead. |
 
 ## Legacy environment knobs