Strip PCIe-M2 (M-key/NVMe) sheet; re-baseline stripped carrier

Drops the unused M.2 M-key/NVMe block — design is 1x M.2 E-key (Wi-Fi)
only, since the CM5 exposes a single PCIe x1 lane (datasheet SC1466),
reserved for the E-key. The 10 freed PCIE_* lanes are NC on Module1
unit 2, to be rewired to a fresh E-key sheet in the add phase.

- CM5_HighSpeed: retire PCIE_* labels/wires, NC pins 102,104,106,109,
  110,112,116,118,122,124
- root CM5IO: drop whole PCIe-M2 (sheet) block; strip dangling PCIE_*
  pins off the kept CM5_HighSpeed sheet symbol
- delete carrier/PCIe-M2.kicad_sch; clean .kicad_pro sheets array + ERC
  exclusion
- retire_block.py: add --drop-sheet FILE (remove whole (sheet) block +
  sheet_instances path)
- analysis/baseline/carrier_stripped.json: new add-phase diff anchor

Verify: ERC 136->133 (zero new violation types); analyzer diff +0/~0
(cumulative -41 removed vs original ref); netlist confirms +5v/+3.3v/
GND/+1.8v intact (U8's M2_3v3 was a local rail, not board +3.3v).

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

carrier/CM5_HighSpeed.kicad_sch

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 	(hierarchical_label "+5v"
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