docs: scaffold polisher-control foundation

docs/07-manual-mode-workflow.md

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+# Manual Mode Workflow
+
+## Operator flow
+
+1. Hardware HOA selector in Auto.
+2. Machine in `IDLE`.
+3. Operator selects Manual Mode.
+4. UI presents the geometric gate:
+   - `r_menante`
+   - `L_menee`
+   - `R_tool`
+   - configured arm amplitude
+   - configured arm center
+5. Operator confirms values.
+6. Operator enters setpoints:
+   - force N
+   - table RPM
+   - spindle RPM
+   - optional force modulation harmonic/amplitude/phase
+7. Operator presses Start.
+8. Host sends `MANUAL_START`.
+9. Operator may adjust setpoints live.
+10. Operator presses Stop.
+11. Host writes the manual-session log, telemetry CSV, events, manifest, and status.
+
+## Hard rules
+
+- Manual mode cannot start with stale geometry.
+- Manual mode uses the same safety/interlocks as job mode.
+- Every setpoint change is logged.
+- Telemetry always runs while force/motion is active.
+- Tool removal uses the documented mechanical sequence; no powered Zero-G in v1.