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/stats.md

@@ -20,6 +20,22 @@ life:
 4. **displayed** — the picture is handed to the screen (as close to "photons" as the
    platform lets us measure).
 
+## Detail levels
+
+The overlay has four levels — **Off → Compact → Normal → Detailed** — that you cycle live
+in-stream:
+
+| Platform | Cycle with |
+|---|---|
+| Linux · Windows · Steam Deck | **Ctrl+Alt+Shift+S** |
+| macOS / iPad (pointer or trackpad) | **⌃⌥⇧S** or a **three-finger tap** |
+| Android · iPhone | a **three-finger tap** |
+
+**Compact** is a one-line pill (fps · end-to-end ms · Mb/s, plus a loss flag when frames are being
+lost). **Normal** adds the stream line and the p50/p95 headline. **Detailed** adds the decoder path,
+HDR tag, and the per-stage breakdown. You can also set the level a stream starts at in each client's
+Settings. The example below is the **Detailed** view.
+
 ## Reading the overlay
 
 ```
@@ -73,7 +89,7 @@ always spelled out rather than pretending:
 
 | client | headline | why |
 |---|---|---|
-| Windows, macOS/iOS (Metal presenter), Linux | `capture→on-glass` / `capture→displayed` | present instant available (GTK measures at hand-off to the compositor, which adds about one compositor cycle after it) |
+| Windows, macOS/iOS (Metal presenter), Linux | `capture→on-glass` / `capture→displayed` | present instant available (on Linux/Windows, measured right after the Vulkan swapchain present) |
 | Android | `capture→displayed` | MediaCodec's per-frame render callback reports SurfaceFlinger's render timestamp; on the rare window where no callback is delivered (the platform may drop them under load) the HUD falls back to `capture→decoded` |
 | macOS/iOS fallback presenter | `capture→received` | the system video layer hides decode and present timing entirely |