feat: add iii-guardrails worker

[rohitg00]

Summary

• Safety layer for function I/O with 3 functions
• PII detection (email, phone, SSN, credit card, IP), injection prevention, secret scanning
• All regex patterns pre-compiled at startup, default patterns work without config file
• All through iii primitives: State, Queue, HTTP triggers
• 30 tests, 0 warnings

Functions

Function	Description
guardrails::check_input	PII, injection, length violations
guardrails::check_output	PII, leaked secrets, length violations
guardrails::classify	Lightweight risk classification

Test plan

• cargo test — 30 tests passing
• cargo check — 0 warnings
• E2E tested: detects email, phone, SSN in live requests

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 891e22d1-676c-492a-a107-0d9004153c0b

📥 Commits

Reviewing files that changed from the base of the PR and between 606a4d4 and 5ef8718.

📒 Files selected for processing (14)

• guardrails/Cargo.toml
• guardrails/README.md
• guardrails/SPEC.md
• guardrails/build.rs
• guardrails/config.yaml
• guardrails/src/checks.rs
• guardrails/src/config.rs
• guardrails/src/functions/check_input.rs
• guardrails/src/functions/check_output.rs
• guardrails/src/functions/classify.rs
• guardrails/src/functions/mod.rs
• guardrails/src/main.rs
• guardrails/src/manifest.rs
• guardrails/src/state.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/guardrails

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