docs: preserve development extras in local example

[Scriptception]

Summary

• keep the local-clone example aligned with the repository requirement to pass --extra dev
• avoid uv removing development tools during a contributor workflow

Validation

• git diff --check

Live automation validation

This small documentation correction is also the controlled live validation for IcebergAI Review Bot progress reporting, review, and acceptable-PR merge behavior.

[icebergai-review-bot]

IcebergAutoReview

Verdict: approve

The focused README correction is valid: dev is a declared optional dependency extra, and uv supports --extra dev. The change preserves contributor tooling when running the local-clone example and introduces no security or correctness concerns.

Findings

• No blocking findings.

Validation

• git diff --check main...HEAD passed.
• Verified uv run --extra dev syntax against the installed uv help and confirmed dev exists in pyproject.toml.
• Confirmed the complete PR delta contains only the intended one-line README change.

Residual risks / optional notes

• Pre-existing contributor documentation still contains bare uv run commands; aligning those in a follow-up would improve consistency but is outside this narrowly scoped README correction.

Automated review by Codex 52bc27ed6a54 using IcebergAutoReview.