chore(skills): add dojo development skill

.claude/skills/dojo-contributing/SKILL.md

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+---
+name: dojo-contributing
+description: Contributor workflow for dojoengine/dojo. Use when implementing or reviewing changes in this repository, especially Rust workspace edits, Cairo fixture refreshes, and CI-parity formatting/lint/test checks.
+---
+
+# Dojo Contributing
+
+Use this skill to make scoped changes in `dojoengine/dojo` and validate them with repository-standard commands.
+
+## Core Workflow
+
+1. Identify affected crates and binaries from `git status` and touched files.
+2. Prepare local test databases:
+   - `bash scripts/extract_test_db.sh`
+3. If Cairo examples, policies, or core behavior changed, refresh artifacts:
+   - `POLICIES_FIX=1 cargo nextest run --all-features --build-jobs 20 --workspace --nocapture policies`
+   - `bash scripts/rebuild_test_artifacts.sh`
+4. Run baseline validation:
+   - `cargo build --workspace`
+   - `cargo nextest run --all-features --build-jobs 20 --workspace`
+5. If Katana behavior is involved, test with a local Katana binary:
+   - `cargo build -r --bin katana`
+   - `KATANA_RUNNER_BIN=./target/release/katana cargo nextest run --all-features --build-jobs 20 --workspace`
+6. Run style and lint checks:
+   - `bash scripts/rust_fmt.sh --fix`
+   - `bash scripts/clippy.sh`
+
+## PR Checklist
+
+- Keep the diff focused to the requested behavior.
+- Include fixture/artifact updates when Cairo-driven behavior changes.
+- Record exact validation commands and outcomes in the PR body.

.claude/skills/dojo-contributing/agents/openai.yaml

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+interface:
+  display_name: "Dojo Contributing"
+  short_description: "Contributor workflow for dojoengine/dojo"
+  default_prompt: "Use $dojo-contributing to implement and validate changes in dojo."