tools/epro2/kicad: --all emits paired .kicad_pro + .kicad_sch + .kicad_pcb per BOARD

KiCad pairs project files purely by basename + same directory: a folder
holding `Foo.kicad_pro`, `Foo.kicad_sch`, `Foo.kicad_pcb` opens as one
project on double-click of the .kicad_pro, with cross-tool navigation
(open footprint from schematic etc) wired up automatically.

  - pro_writer.write_kicad_pro() renders the minimal KiCad 8 JSON we
    need: meta.filename pinning the basename, sheets=[[<root_uuid>,
    ""]] binding the schematic root, and stub blocks for board /
    schematic / net_settings / erc that KiCad expects to find on the
    first GUI load.
  - root_sch_writer.write_root_sheet() now accepts an optional
    root_uuid so the caller can pass the same uuid into the .kicad_pro
    and .kicad_sch (the binding fails silently with mismatched ids).
  - CLI gains `--all`: groups SCH/PCB docs by their META.board uuid
    (1:1 in EPRO2), strips SCH-/PCB- editor prefixes from titles to
    derive a shared project basename, and emits one directory per
    BOARD with paired files. BOARDs whose SCH is DELETE_DOC (LCD-BD on
    ESP-VoCat) still get a .kicad_pro with sheets:[] + .kicad_pcb so
    pcbnew opens cleanly.

ESP-VoCat smoke: 6 boards → 6 project dirs, all pairs validated by
kicad-cli sch erc / pcb export svg. The CoreBoard pro/sch/pcb trio
shares root uuid 366d3e53...c2fccbe4330b end-to-end.

68 → 71 unit tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/epro2/kicad/root_sch_writer.py

@@ -69,6 +69,7 @@ def write_root_sheet(
     children: list[ChildSheet],
     *,
     project_name: str = "facere",
+    root_uuid: str | None = None,
     grid_origin_mm: tuple[float, float] = (38.1, 38.1),
     box_size_mm: tuple[float, float] = (50.8, 25.4),
     box_pitch_mm: tuple[float, float] = (63.5, 38.1),
@@ -112,7 +113,7 @@ def write_root_sheet(
         Sym("kicad_sch"),
         [Sym("version"), KICAD_SCH_VERSION],
         [Sym("generator"), KICAD_GENERATOR],
-        [Sym("uuid"), new_sheet_uuid()],
+        [Sym("uuid"), root_uuid or new_sheet_uuid()],
         [Sym("paper"), "A4"],
         [Sym("title_block"),
             [Sym("title"), title],