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8701b8645d
Adds a full RemoteShell (portnum=13) implementation matching Jonathan's dmshell_client.py protocol: Protocol layer: - Seq/ack reliability: incrementing seq on every non-ACK frame, piggybacked ack_seq, out-of-order frame buffering, gap detection and replay requests - TX history ring buffer (last 50 frames) for retransmission on request - ACK frames carry optional 4-byte big-endian REPLAY_REQUEST payload - PING/PONG heartbeat with 8-byte status payload (lastTxSeq, lastRxSeq); PONG handler triggers replay if peer is behind - PKI: DataPacket.PKC_CHANNEL_INDEX so CommandSenderImpl applies Curve25519 encryption (firmware rejects non-PKI DMShell packets) - Input batching: 500ms debounce (matches Python client), immediate flush on \r, \t, buffer-full (64 bytes), or Enter Terminal UI: - Retro-CRT composables: TerminalCanvas (phosphor glow, two-pass bloom), ScanlinesOverlay, FlickerEffect (animated brightness variation), CrtCurvatureModifier (AGSL barrel distortion on Android 12+, no-op on JVM) - PhosphorPreset enum: GREEN (P1), AMBER (P3), WHITE (P4) - Pending-input rendered inline in preset.dim colour; snaps to confirmed on flush - Hidden zero-size BasicTextField captures soft and hardware keyboard input - Phosphor colour picker dropdown in top bar Capabilities gate: - supportsRemoteShell gated to UNRELEASED (9.9.9) - Entry only visible in AdministrationSection when node.capabilities.supportsRemoteShell