feat(client): Vulkan session binary — SDL3 + ash presenter MVP (phase 1)

punktfunk-session streams one --connect session in an SDL3 window: ash
swapchain with a transfer-only letterboxed blit of the software-decode
path (no graphics pipeline until the phase-2 dmabuf/CSC pass), the
ui_stream input-capture state machine on SDL events (scancode→VK table
cross-checked against the evdev one), gamepads via a new caller-pumped
GamepadService mode (SDL video owns the main thread here), and the
shell↔session stdout contract: {"ready":true}, per-window stats:
lines, JSON error + exit codes 0/2/3/4. Strict trust — no pin, no
connect. Design: punktfunk-planning linux-client-rearchitecture.md.

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

Cargo.lock

@@ -2766,6 +2766,19 @@ dependencies = [
  "bytemuck",
 ]
 
+[[package]]
+name = "pf-presenter"
+version = "0.8.2"
+dependencies = [
+ "anyhow",
+ "ash",
+ "async-channel",
+ "pf-client-core",
+ "punktfunk-core",
+ "sdl3",
+ "tracing",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.17"
@@ -2956,6 +2969,18 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "punktfunk-client-session"
+version = "0.8.2"
+dependencies = [
+ "anyhow",
+ "pf-client-core",
+ "pf-presenter",
+ "punktfunk-core",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "punktfunk-client-windows"
 version = "0.8.2"
@@ -3703,6 +3728,7 @@ version = "0.6.6+SDL-3.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04e7f134def04ed72e6f55187c6c29c72f7dab5d359c4be0dd49c9b97fef59c7"
 dependencies = [
+ "ash",
  "cc",
  "cmake",
  "pkg-config",