chore(outputs): add bom, schematic pdf/svg, and erc report for current design

Snapshot the post-boost-integration design outputs: BOM CSV, schematic
PDF and SVG exports, and the ERC report against the current schematic.

Confidence: high
Scope-risk: narrow
Directive: These are regenerated outputs - refresh them when the schematic changes

bom.csv

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+Reference,Component,Value,Qty,Package,AliExpress Search/Link,AliExpress Price Est.,DigiKey Part Number,DigiKey Price Est.,Notes
+ESP32-WROOM1,ESP32-WROOM-32 DevKit,ESP32-C3-DevKitM-1,1,Module,"ESP32 WROOM 32 development board 30 pin",~$4.00,N/A (use Adafruit/SparkFun),,Type-C versions slightly more
+A4988,A4988 Stepper Motor Driver,Pololu_Breakout_A4988,1,Module,"A4988 stepper motor driver module heatsink",~$2.00,Pololu #1182,~$5.95,Usually comes with heatsink. Packs of 5 ~$5
+U1,TPS61088 Boost Converter IC,TPS61088RHLR,1,QFN-20 3.5x3.5mm,"TPS61088RHLR QFN20",~$2.28/ea (3pcs min ~$6.84),296-40481-1-ND,~$3.89,LCSC C87357 ~$0.44/ea as alternative
+R1,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
+R2,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
+R5,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
+R3,Resistor 0805 1% (feedback divider),30.1K,1,0805,"0805 resistor 30.1K 1% SMD",~$1.50/100pcs,RC0805FR-0730K1L,~$0.10,E96 value - not in basic kits. 1% required.
+R4,Resistor 0805 1% (feedback divider),190K,1,0805,"0805 resistor 190K 1% SMD",~$1.50/100pcs,RC0805FR-07190KL,~$0.10,E96 value - not in basic kits. 1% required.
+C8,Capacitor 0805 C0G/NP0 50V,47pF,1,0805,"0805 47pF capacitor C0G",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,C0G preferred for low-value caps
+C9,Capacitor 0805 X7R 50V,100nF,1,0805,"0805 100nF 0.1uF capacitor",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,Decoupling cap
+C6,Capacitor 0805 X7R 50V,22nF,1,0805,"0805 22nF capacitor X7R",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,TPS61088 compensation cap
+C4,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
+C5,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
+C10,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
+C11,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
+C3,Capacitor SMD Electrolytic 25V,100uF,1,6.3x5.8mm,"100uF 25V SMD aluminum electrolytic capacitor 6.3mm",~$1.30/20pcs,Standard Nichicon/Panasonic,~$0.50,Verify pad matches KiCad footprint
+L1,Power Inductor Shielded SMD,2.2uH,1,12.6x12.6mm,"SRP1265 2.2uH inductor",~$3.00,SRP1265A-2R2M (Bourns),~$2-3,Must handle >=10A. Critical for TPS61088. DigiKey safest source.
+SW1,JST EH 3-pin Header,B3B-EH-A,1,Through-hole,"JST EH 3 pin connector 2.5mm header",~$1.00/10pcs,B3B-EH-A(LF)(SN),~$0.13,2.5mm pitch. Buy matching housings + crimp pins.
+MotorPower1,Screw Terminal 3-pin 5mm pitch,KF301-5.0-3P,1,Through-hole,"KF301 3 pin 5mm screw terminal PCB",~$0.50-1.00,Standard part,~$0.50-1.00,KF301-5.0-3P common Chinese equivalent
+StepperConnection1,JST XH 4-pin Header,B4B-XH-A,1,Through-hole,"JST XH 4 pin 2.54mm connector header",~$1.00/20pcs,B4B-XH-A(LF)(SN),~$0.15,2.54mm pitch. Buy matching housings + crimp pins.

firstpcb-erc.rpt

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+ERC report (2026-04-20T17:48:43-0400, Encoding UTF8)
+
+***** Sheet /
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 36.83 mm): Symbol ESP32-WROOM1 Pin 15 [EN, Bidirectional, Line]
+[power_pin_not_driven]: Input Power pin not driven by any Output Power pins
+    ; error
+    @(35.56 mm, 29.21 mm): Symbol #PWR05 Pin 1 [Power input, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 39.37 mm): Symbol ESP32-WROOM1 Pin 14 [VP, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 41.91 mm): Symbol ESP32-WROOM1 Pin 13 [VN, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 44.45 mm): Symbol ESP32-WROOM1 Pin 12 [D34, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 46.99 mm): Symbol ESP32-WROOM1 Pin 11 [D35, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 49.53 mm): Symbol ESP32-WROOM1 Pin 10 [D33, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 52.07 mm): Symbol ESP32-WROOM1 Pin 9 [D32, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 54.61 mm): Symbol ESP32-WROOM1 Pin 8 [D25, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 57.15 mm): Symbol ESP32-WROOM1 Pin 7 [D26, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 59.69 mm): Symbol ESP32-WROOM1 Pin 6 [D27, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 36.83 mm): Symbol ESP32-WROOM1 Pin 30 [D23, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 62.23 mm): Symbol ESP32-WROOM1 Pin 5 [D14, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 39.37 mm): Symbol ESP32-WROOM1 Pin 29 [D22, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 64.77 mm): Symbol ESP32-WROOM1 Pin 4 [D12, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 41.91 mm): Symbol ESP32-WROOM1 Pin 28 [TX0, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 44.45 mm): Symbol ESP32-WROOM1 Pin 27 [RX0, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(25.40 mm, 67.31 mm): Symbol ESP32-WROOM1 Pin 3 [D13, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 57.15 mm): Symbol ESP32-WROOM1 Pin 22 [D17, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 59.69 mm): Symbol ESP32-WROOM1 Pin 21 [D16, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 67.31 mm): Symbol ESP32-WROOM1 Pin 18 [D15, Bidirectional, Line]
+[pin_not_connected]: Pin not connected
+    ; error
+    @(55.88 mm, 69.85 mm): Symbol ESP32-WROOM1 Hidden pin 17 [GND, Bidirectional, Line]
+[lib_symbol_issues]: The current configuration does not include the symbol library 'A1-KnockOffs'
+    ; warning
+    @(40.64 mm, 49.53 mm): Symbol ESP32-WROOM1 [ESP-WROOM-32]
+[missing_unit]: Symbol SW1 has unplaced units [ B ]
+    ; warning
+    @(26.67 mm, 102.87 mm): Symbol SW1 [SW_DPDT_x2]
+[lib_symbol_mismatch]: Symbol 'Conn_01x04_MountingPin' doesn't match copy in library 'Connector_Generic_MountingPin'
+    ; warning
+    @(113.03 mm, 49.53 mm): Symbol StepperConnection1 [Conn_01x04_MountingPin]
+[lib_symbol_mismatch]: Symbol 'TPS61088' doesn't match copy in library 'TPS61088'
+    ; warning
+    @(80.01 mm, 140.97 mm): Symbol U1 [TPS61088]
+
+ ** ERC messages: 26  Errors 22  Warnings 4