feat(schematic): replace L7805 with TPS61088 boost converter (#1)

Reviewed-on: #1

pcbway_export/README.txt

@@ -0,0 +1,39 @@
+firstpcb — PCBWay fabrication package
+======================================
+
+Board specifications
+--------------------
+Size:               81.0 mm x 60.0 mm (rectangular)
+Layers:             2 (F.Cu, B.Cu)
+Thickness:          1.6 mm (default; confirm in checkout)
+Min trace/space:    0.20 mm
+Min hole:           0.30 mm (PTH); 2.20 mm NPTH for M2 mounting holes
+Finish:             HASL (default; ENIG OK)
+Solder mask:        Green (default; any color)
+Silkscreen:         White
+Units:              mm, absolute origin
+
+File manifest
+-------------
+firstpcb-F_Cu.gtl            Top copper
+firstpcb-B_Cu.gbl            Bottom copper
+firstpcb-F_Mask.gts          Top solder mask
+firstpcb-B_Mask.gbs          Bottom solder mask
+firstpcb-F_Silkscreen.gto    Top silkscreen
+firstpcb-B_Silkscreen.gbo    Bottom silkscreen
+firstpcb-F_Paste.gtp         Top paste (for stencil; optional)
+firstpcb-B_Paste.gbp         Bottom paste (no SMD on bottom; effectively empty)
+firstpcb-Edge_Cuts.gm1       Board outline
+firstpcb-PTH.drl             Plated through holes (78 hits)
+firstpcb-NPTH.drl            Non-plated holes (4 hits, 2.20 mm M2 mounting)
+firstpcb-PTH-drl_map.pdf     PTH drill map (reference only)
+firstpcb-NPTH-drl_map.pdf    NPTH drill map (reference only)
+firstpcb-job.gbrjob          KiCad gerber job file (reference)
+
+Notes
+-----
+- Gerber format: RS-274X (Protel extensions), 4.6 precision, mm.
+- Drill format: Excellon, absolute coords, mm, decimal zeros, separate PTH/NPTH.
+- DRC: passes with 0 errors. Only "library hygiene" warnings remain
+  (inline footprint copies of U2 and the 4 mounting holes differ from
+  their source libraries — no manufacturing impact).