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>

clients/android/kit/build.gradle.kts

@@ -32,7 +32,7 @@ dependencies {
 }
 
 // ------------------------------------------------------------------------------------------------
-// cargo-ndk: cross-compile crates/punktfunk-android into this module's jniLibs/<abi>/ so the
+// cargo-ndk: cross-compile clients/android/native (punktfunk-client-android) into this module's jniLibs/<abi>/ so the
 // resulting libpunktfunk_android.so is packaged into the app (and any AAR this module produces).
 // NDK r28+ aligns to 16 KB pages by default — no extra linker flags. Prereqs (see clients/android
 // /README.md): `cargo install cargo-ndk` + `rustup target add aarch64-linux-android x86_64-linux-android`.
@@ -57,7 +57,7 @@ fun androidSdkDir(): String {
 fun registerCargoNdk(taskName: String, release: Boolean) =
     tasks.register<Exec>(taskName) {
         group = "rust"
-        description = "cargo-ndk build of punktfunk-android (${if (release) "release" else "debug"})"
+        description = "cargo-ndk build of punktfunk-client-android (${if (release) "release" else "debug"})"
         workingDir = repoRoot
         val sdk = androidSdkDir()
         // A GUI Android Studio launch does not source the login shell, so make cargo, the NDK, and
@@ -84,7 +84,7 @@ fun registerCargoNdk(taskName: String, release: Boolean) =
             // Link against the minSdk-31 sysroot so libaaudio (API 26+) is found.
             "--platform", "31",
             "-o", file("src/main/jniLibs").absolutePath,
-            "build", "-p", "punktfunk-android",
+            "build", "-p", "punktfunk-client-android",
         )
         if (release) cmd += "--release"
         commandLine(cmd)

clients/android/kit/src/main/kotlin/io/unom/punktfunk/kit/NativeBridge.kt

@@ -3,7 +3,7 @@ package io.unom.punktfunk.kit
 /**
  * The single JNI seam to `libpunktfunk_android.so` (the Rust-heavy client core).
  *
- * Symbols are implemented in `crates/punktfunk-android`. This object is intentionally thin —
+ * Symbols are implemented in `clients/android/native`. This object is intentionally thin —
  * all protocol logic lives in Rust (`punktfunk-core` + the connector); Kotlin only marshals.
  */
 object NativeBridge {