Add investor business plan (draft 0.1) with its Python builder

Leased land instead of purchase, in-house cassette duplication, CD-R
duplication with CD replication shown as a separate investor decision,
Ploy Printing as packaging partner and intended co-investor, and a
dedicated section on traceability, metrology, QC and efficiency.

docs/business-plan/build/build_plan.py

@@ -0,0 +1,33 @@
+"""Build the CNX Vinyl business plan .docx.
+
+    python build_plan.py            -> ../CNX-Vinyl-Business-Plan.docx
+    python build_plan.py out.docx   -> custom path
+
+Images are resolved relative to docs/ (the parent of business-plan/).
+"""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).resolve().parent
+sys.path.insert(0, str(HERE))
+
+from plan_lib import Renderer  # noqa: E402
+import content_a, content_b, content_c  # noqa: E402
+
+DOCS = HERE.parent.parent          # .../docs
+OUT = HERE.parent / "CNX-Vinyl-Business-Plan.docx"
+
+
+def main(out: Path = OUT) -> Path:
+    r = Renderer(DOCS, header_text="CNX Vinyl / Poy Records: Business plan, draft 0.1, September 2026",
+                 footer_text="Confidential")
+    r.render(content_a.blocks() + content_b.blocks() + content_c.blocks())
+    r.save(out)
+    return out
+
+
+if __name__ == "__main__":
+    target = Path(sys.argv[1]) if len(sys.argv) > 1 else OUT
+    print(main(target))