Support Remote browser and media keys and connection history UI

Accept the eighteen browser, volume, media and launch identities in the input vocabulary and both SDKs. Exercise media-key capture on the private Xorg harness, and permit only the new remember-host checkbox in the connection form integration test.

Validated: affected-package race tests, Tentacles make check, private native_remote_input.py and native_remote_keys.py. Physical input, live peer interoperability, speech and Braille acceptance remain pending.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sdk/python/cthulhu_tentacle/session.py

@@ -126,7 +126,12 @@ def valid_remote_key(key):
             "KP_Left", "KP_Up", "KP_Right", "KP_Down", "KP_Insert", "KP_Delete",
             "KP_Multiply", "KP_Add", "KP_Separator", "KP_Subtract", "KP_Decimal", "KP_Divide",
             "semicolon", "equal", "comma", "minus", "period", "slash", "grave", "bracketleft",
-            "backslash", "bracketright", "apostrophe")
+            "backslash", "bracketright", "apostrophe",
+            # Browser, volume, media and launch keys (Windows VK 0xa6-0xb7).
+            "XF86Back", "XF86Forward", "XF86Reload", "XF86Stop", "XF86Search", "XF86Favorites",
+            "XF86HomePage", "XF86AudioMute", "XF86AudioLowerVolume", "XF86AudioRaiseVolume",
+            "XF86AudioNext", "XF86AudioPrev", "XF86AudioStop", "XF86AudioPlay", "XF86Mail",
+            "XF86AudioMedia", "XF86MyComputer", "XF86Calculator")
     except (ProtocolError, TypeError, ValueError):
         return False