docs: scaffold polisher-control foundation

AGENTS.md

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+# AGENTS.md — Polisher-Control Repo Rules
+
+This repository is an external-collaborator technical workspace for the P11 / Fullum / GigaBIT polisher-control implementation.
+
+## Scope
+
+Allowed work:
+- Teensy firmware
+- Raspberry Pi / host controller
+- touchscreen/manual-mode workflow support
+- host↔Teensy protocol
+- telemetry/logging/run artifacts
+- safety/interlocks/alarms/watchdogs
+- machine capability profile
+- tests, commissioning scripts, and technical docs
+
+Out of scope:
+- optical figuring strategy
+- metrology interpretation
+- optimization / calibration logic
+- client/commercial context
+- private Antoine notes / unrelated projects
+- credentials or secrets
+
+## Architecture rule
+
+`polisher-control` executes. It does not decide strategy.
+
+If a change affects architecture, telemetry names/units/rates, safety behavior,
+protocol semantics, or v1 scope, log it as a proposal and ask Antoine before
+treating it as accepted direction.
+
+## Commit hygiene
+
+Prefer small commits:
+- `docs: ...`
+- `firmware: ...`
+- `host: ...`
+- `test: ...`
+- `config: ...`
+
+Never commit real machine data, secrets, invoices, tokens, or private notes.