Merge origin/main (shared clipboard Phase 1) into the local W6.2 + rumble-D line

Reconciles the two diverged mains: the local stack (W6.1/W6.2 crate decomposition,
lid-closed fixes, ABR climb gating, rumble root-fix A-D incl. the W7 core module
splits) x origin/main (clipboard wire ABI v8 + pf-clipboard + the macOS client).

Textual conflicts were trivial (host Cargo.toml dep union; Cargo.lock + the
cbindgen header regenerate). The real work was structural: the local line's W7
splits dissolved the two files the clipboard's Phase 0 landed in, so the merge
left both layouts side by side. Resolved by re-homing the clipboard delta into
the split layout and deleting the stale flat files:

- quic/msgs.rs -> quic/clip.rs (the 0x40-0x44 messages, CLIP_* vocabulary,
  codecs) + HOST_CAP_CLIPBOARD into quic/caps.rs beside GAMEPAD_STATE; mod.rs
  declares clip and fixes the split-by-concern doc.
- client.rs -> the client/ split: CtrlRequest clip variants + Negotiated.host_caps
  (control.rs), CLIP_EVENT_QUEUE (planes.rs), clip channel ends (worker.rs),
  NativeClient clip surface + channels (mod.rs), control-task encode/decode arms +
  the clipboard task spawn (pump.rs).

Verified on macOS: core 174/174 (merged rumble + clipboard suites), pf-clipboard
clippy -D warnings clean, fmt applied, header regenerated. Host-side compile
rides the Linux/Windows legs.

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

clients/apple/Tests/PunktfunkKitTests/SharedFoundationTests.swift

@@ -18,7 +18,7 @@ final class SharedFoundationTests: XCTestCase {
             name: "Tower", address: "192.168.1.173", port: 9777,
             pinnedSHA256: Data([0xDE, 0xAD, 0xBE, 0xEF]),
             lastConnected: Date(timeIntervalSince1970: 1_700_000_000),
-            mgmtPort: 47990, macAddresses: ["aa:bb:cc:dd:ee:ff"])
+            mgmtPort: 47990, macAddresses: ["aa:bb:cc:dd:ee:ff"], clipboardSync: true)
 
         let data = try JSONEncoder().encode(host)
         let decoded = try JSONDecoder().decode(StoredHost.self, from: data)
@@ -39,6 +39,7 @@ final class SharedFoundationTests: XCTestCase {
         XCTAssertNil(decoded.macAddresses)
         XCTAssertNil(decoded.pinnedSHA256)
         XCTAssertNil(decoded.lastConnected)
+        XCTAssertNil(decoded.clipboardSync)
         // Resolvers fall back cleanly.
         XCTAssertEqual(decoded.effectiveMgmtPort, punktfunkDefaultMgmtPort)
         XCTAssertEqual(decoded.wakeMacs, [])