Product repository template

Layout, proplan.toml, README/CHANGELOG, placeholder product image, .gitignore, KiBot/release/docgen workflows and TEMPLATE.md. Source of truth: contrib/product-template in B4L/proplan (cargo test --test product_template checks it as Gitea 1.27 creates a repository from it).

kibot.yaml

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+# KiBot outputs for every board; the workflows run KiBot inside each board
+# folder (hardware/<board>/). Adapted from LVSolarBuck's kibot.yaml.
+kibot:
+  version: 1
+
+preflight:
+  erc:
+    warnings_as_errors: false
+    dont_stop: true
+  drc:
+    warnings_as_errors: false
+    dont_stop: true
+  check_zone_fills: true
+
+outputs:
+  - name: schematic_pdf
+    comment: Schematic PDF
+    type: pdf_sch_print
+    dir: Schematic
+
+  - name: gerbers
+    comment: Gerber files
+    type: gerber
+    dir: Gerbers
+    options:
+      exclude_edge_layer: true
+      exclude_pads_from_silkscreen: true
+      plot_footprint_refs: true
+      plot_footprint_values: false
+      create_gerber_job_file: true
+      subtract_mask_from_silk: true
+    layers:
+      - copper
+      - F.Paste
+      - B.Paste
+      - F.Silkscreen
+      - B.Silkscreen
+      - F.Mask
+      - B.Mask
+      - Edge.Cuts
+
+  - name: drill
+    comment: Drill files
+    type: excellon
+    dir: Gerbers
+    options:
+      metric_units: true
+      pth_and_npth_single_file: false
+
+  - name: position
+    comment: Pick and place
+    type: position
+    dir: Assembly
+    options:
+      format: CSV
+      units: millimeters
+      separate_files_for_front_and_back: true
+      only_smd: false
+
+  - name: bom
+    comment: Bill of materials
+    type: bom
+    dir: BoM
+    options:
+      format: CSV
+
+  - name: fabrication
+    comment: Fabrication package
+    type: compress
+    dir: .
+    options:
+      output: '%f-fabrication.%x'
+      format: ZIP
+      files:
+        - from_output: gerbers
+          dest: /
+        - from_output: drill
+          dest: /