Ship a reference guardian-bot implementation in `scripts/`

[nanaf6203-bit]

Problem Statement

No shipping daemon that watches oracle prices and pauses bridge on drift.

Why it matters

Operational realism.

Technical Context

Rust binary at scripts/guardian-bot.rs reading chain events.

Expected Outcome

Documented deployment.

Acceptance Criteria

1. README.
2. Smoke test.
3. Configurable thresholds.
4. Documentation.

Implementation Notes

Rust binary + Docker image.

Files or modules likely to be affected

scripts/guardian-bot/.

Dependencies

#108.

Difficulty level

MEDIUM.

Estimated effort

L (~3 days).

[Legit003]

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[aburex12345]

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