Summary

Adds three team-owned style guide harnesses under docs/style-guides/ for the CCIP tooling standardization effort. Each file provides structure, cross-links, scope boundaries (platform vs EVM vs ops), a copyable rule template aligned with deployment/docs/style-guide-contributions.md, and directional topic lists for teams to fill in—not substantive rules.

What changed

• docs/style-guides/platform.md — Chain-agnostic changeset practices (shared shapes, refs, datastore, abstractions, etc.).
• docs/style-guides/evm.md — EVM-specific changeset authoring (selectors, contract surfaces, adapter usage).
• docs/style-guides/ops.md — Operating and reviewing work via chainlink-deployments (pipelines, environments, run review).

Each guide links to the other two, to deployment/docs/style-guide.md, and to deployment/docs/style-guide-contributions.md for the shared maintenance pattern.

Why

Reduces implicit knowledge for contributors and reviewers by giving each area a consistent place to capture durable rules over time, without duplicating deployment architecture docs or overlapping concerns across the three guides.