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>

packaging/flatpak/io.unom.Punktfunk.yml

@@ -71,7 +71,7 @@ finish-args:
   - --socket=pulseaudio
   # --- network: QUIC control + UDP data plane + mDNS discovery (_punktfunk._udp) ---
   - --share=network
-  # --- persistent client identity / pairing store (shared with punktfunk-client-rs) ---
+  # --- persistent client identity / pairing store (shared with punktfunk-probe) ---
   - --filesystem=~/.config/punktfunk:create   # client-{cert,key}.pem, known-hosts, settings
 
 build-options:
@@ -145,7 +145,7 @@ modules:
       # Windows client; this edits only the sandbox copy of Cargo.toml. (No --locked: the lock
       # no longer matches the reduced member set; --offline still pins every crate to the
       # vendored cargo-sources.json, so the build stays reproducible.)
-      - sed -i '\#"crates/punktfunk-client-windows",#d' Cargo.toml
+      - sed -i '\#"clients/windows",#d' Cargo.toml
       - cargo --offline build --release -p punktfunk-client-linux
       - install -Dm0755 target/release/punktfunk-client ${FLATPAK_DEST}/bin/punktfunk-client
       # Desktop entry (renamed to the app id; Exec is the in-sandbox binary).