feat(skills): add rust style skill

.pi/prompts/review-rust.md

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+---
+description: Review Rust changes against repository Rust style rules
+argument-hint: "[target]"
+---
+
+Use the `rust-style` skill.
+Audit ${ARGUMENTS:-the staged diff} for violations of the repository Rust style rules.
+
+Report only actionable findings.
+Order findings by severity.
+Do not report preferences unless a loaded rule states them.
+
+Use this format for each finding:
+
+```text
+`code-path:line`
+> `smallest reviewed-code excerpt that shows the violation`
+
+`rule-file:line`: Finding title.
+Summary: why the code breaks the rule
+Fix: suggested fix
+```
+
+Keep the code excerpt to one to three lines when possible.
+Use a longer excerpt only when the violation needs surrounding context.
+Use `...` to omit unrelated lines from a multi-line excerpt.
+Use a skill-relative rule citation, such as `tests.md:7`.
+Make the fix direct.
+Do not include alternatives when one fix best follows the cited rule.
+
+It is acceptable to report no findings when the reviewed Rust already follows the loaded rules.

.pi/skills/rust-style

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+../../src/skills/rust-style