Agent: Objective Add a ## Local development section to `README.md

[malon64]

Automated changes by agent.\n\nInstruction:\nObjective
Add a ## Local development section to README.md with accurate setup and run steps for contributors.

Scope

• Update README with prerequisites, install/setup, environment configuration, and local run commands.
• Keep wording and heading style consistent with the existing README.
• Verify documented commands exist in the repository scripts/tooling.

Non-goals

• No feature code changes.
• No broad README rewrite.
• No CI workflow redesign.

Implementation notes

• Prefer one primary local workflow; list alternatives only if already supported.
• Use concise, copy-paste-safe command blocks.
• Avoid unrelated formatting churn.

Tests

• Run markdown/doc checks that CI enforces (if present).
• Manually verify the documented local commands are valid.
• Validate any links added.

Acceptance

• README contains a clear ## Local development section.
• Instructions are accurate and actionable for a new contributor.
• Diff remains focused on this documentation objective.