Add Periscope Cursor engineering constitution and always-on rules.

Docs-only: master CODING_CONSTITUTION plus seven .mdc splits. Git policy is phase = test then commit+push; deploy only after a macro-phase.
2026-09-20 18:06:00 +02:00
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+---
+alwaysApply: true
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+# Periscope Cursor Engineering Rules
+
+Mandatory for every Cursor agent working on Periscope. This section is copied from `docs/development/CODING_CONSTITUTION.md` and must not contradict that master.
+
+## 3. Rust
+
+- Periscope’s product code is Python/TypeScript today. If a Rust crate is added, it is original Periscope code, not a paste of an AGPL PinScope module.
+- Rust slices follow the same verify-then-switch rule: tests first, then wire into the Python/TS surface.
+- Use `rustfmt` + `clippy` on that crate. No `unsafe` without a comment that names the invariant.
+- Do not introduce Rust to dodge AGPL or to empty-delete Python in `dependency/`.