docs: scaffold polisher-control foundation

docs/reference/source-map.md

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+# Source Map
+
+This repo foundation is derived from the current P11 / Fullum polisher-control planning context.
+
+Primary source documents:
+
+- Fullum Polisher — Machine Control & Firmware Specification v1
+- Controller / Bridge / Digital Twin Architecture Plan
+- polisher-control — System Definition
+- polisher-control — Roadmap
+- Polisher Software Suite index and shared schema bundle
+
+Source-truth rule:
+
+- These repo docs are implementation aids.
+- Approved P11 source specs and schemas outrank generated summaries.
+- If anything here conflicts with a source spec, ask Antoine before changing technical direction.