refactor: drop milestone names + consolidate clients; loss-recovery & rumble fixes

Two bodies of work in one commit (the rename moved files the fixes also touched).

Naming/structure cleanup (pre-launch):
- Host modules m3.rs->punktfunk1.rs, m0.rs->spike.rs; CLI m3-host->punktfunk1-host,
  m0->spike; bare `punktfunk-host` now prints help. Types M3Options/M3Source->
  Punktfunk1Options/Punktfunk1Source.
- Clients consolidated out of crates/ into clients/: punktfunk-client-rs->
  clients/probe (crate punktfunk-probe), client-linux->clients/linux,
  client-windows->clients/windows, punktfunk-android->clients/android/native
  (crate punktfunk-client-android; kept [lib] name=punktfunk_android so the JNI
  contract is unchanged). crates/ now holds only core + host.
- Milestone codes M0-M4 purged from code/CLI/CLAUDE.md/README/docs/docs-site,
  kept only in docs/implementation-plan.md. docs/m2-plan.md->
  docs/gamestream-host-plan.md. CI/gradle/flatpak paths updated.

Client loss-recovery (video froze and never recovered after a brief drop):
- Export punktfunk_connection_frames_dropped through the C ABI (the core already
  tracked it for the client keyframe-recovery loop; it was never reachable from
  the ABI clients). Regenerated punktfunk_core.h.
- Apple (StreamPump + Stage2Pipeline) and Android (decode.rs) now poll
  frames_dropped and request a keyframe when it climbs -- the same loss-driven
  recovery Linux/Windows already had. Under infinite GOP the decoder silently
  conceals reference-missing frames, so the decode-error trigger rarely fires.

Apple rumble robustness (worked then went spotty -- DualSense + Xbox):
- Add CHHapticEngine stopped/reset handlers (rebuild on app background / audio
  interruption / server reset) and drop the permanent `broken` latch on a
  transient drive failure; latch only when the controller truly has no haptics.
- Surface swallowed SDL set_rumble errors on Linux/Windows + diagnostic logging.

Verified: cargo build/clippy/fmt --workspace, C-ABI harness, header drift.
Not runnable on this box (verify in CI): Gitea workflows, gradle/Android,
flatpak, Swift/decky.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-host/src/capture.rs

@@ -1,4 +1,4 @@
-//! Frame capture (plan §7). On Linux: a PipeWire ScreenCast portal stream. M0 uses the
+//! Frame capture (plan §7). On Linux: a PipeWire ScreenCast portal stream. The spike uses the
 //! CPU-copy fallback (the portal delivers a CPU buffer; the encoder uploads it to the GPU
 //! internally). Zero-copy dmabuf→NVENC import is deferred (plan §9 risk).
 
@@ -45,7 +45,7 @@ impl PixelFormat {
 }
 
 /// A captured frame. [`format`](Self::format)/dimensions describe the pixels regardless of
-/// where they live — [`payload`](Self::payload) is either a CPU buffer (the M0/fallback path)
+/// where they live — [`payload`](Self::payload) is either a CPU buffer (the spike/fallback path)
 /// or a GPU buffer already on the device (the zero-copy path, plan §9).
 pub struct CapturedFrame {
     pub width: u32,
@@ -103,7 +103,7 @@ pub trait Capturer: Send {
     fn set_active(&self, _active: bool) {}
 }
 
-/// A deterministic moving test pattern (BGRx). Lets M0 exercise the encode → file →
+/// A deterministic moving test pattern (BGRx). Lets the spike exercise the encode → file →
 /// `punktfunk_core` path with no live capture session, and produces obviously non-static
 /// content (a sweeping bar + animated gradient) so the encoded output is verifiable.
 pub struct SyntheticCapturer {