lexus2k / tinyproto / 23963885145

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NRM: P/F burst fix, CR bit fix, disconnected state filter, 9 new tests

Library fixes:
- P/F bit now only set on last I-frame in NRM burst (enables full window
  throughput). S/U frames always get P/F for marker passing.
- Add missing CR bit on idle-path SNRM (consistency with timeout path)
- Add disconnected state filter in __on_u_frame_read(): rejects non-SABM/
  SNRM/UI U-frames when peer is disconnected, sends DM for commands
- Update ABM test to expect DM (not UA) for DISC when disconnected

New NRM tests (9 added, 82 total):
- PrimaryToSecondary_SingleIFrame: I-frame with P bit on single frame
- MultiplIFrames_PFOnLastOnly: P/F burst - first frame no P, last has P
- SecondaryToRrimary_IFrameReceive: data reception + RR acknowledgment
- MarkerTimeoutRecovery: primary reclaims marker after retry_timeout
- PrimaryDisconnect: DISC+P / UA+F exchange
- DMResponseWhenDisconnected: DM+F for command when disconnected
- RoundRobinPeerSwitching: alternating I-frames between 2 peers
- FRMRRecovery: FRMR triggers disconnect + SNRM re-establishment
- REJRecovery: REJ retransmission with proper round-robin cycle

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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