chore(skills): add repository development skill

Author: Larkooo

.agents/skills/torii-development/SKILL.md

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+---
+name: torii-development
+description: Contributor workflow for dojoengine/torii. Use when implementing or reviewing changes in Torii indexer, processors, GraphQL/gRPC surfaces, SQLite migrations, and CI-aligned tests.
+---
+
+# Torii Development
+
+Use this skill to ship focused changes in `dojoengine/torii` with correct fixture handling and CI-like checks.
+
+## Core Workflow
+
+1. Identify impacted crates (`indexer`, `processors`, `sqlite`, `server`, `graphql`, `grpc`, `runner`, `cli`).
+2. Prepare fixtures:
+   - `bash scripts/extract_test_db.sh`
+3. If Cairo artifacts changed, rebuild test assets:
+   - `bash scripts/rebuild_test_artifacts.sh sozo katana`
+4. Build and test:
+   - `cargo build --workspace`
+   - `KATANA_RUNNER_BIN=katana cargo nextest run --all-features --workspace`
+   - Use `bash scripts/selective_test.sh <base_branch>` for scoped runs
+5. Run formatting and lint checks:
+   - `bash scripts/rust_fmt.sh --fix`
+   - `bash scripts/clippy.sh`
+6. If migrations changed, run and verify migration steps for `crates/migrations`.
+
+## PR Checklist
+
+- Include migration impact explicitly when applicable.
+- Keep fixture updates in the same PR as related code changes.
+- Document validation commands and outcomes.

.agents/skills/torii-development/agents/openai.yaml

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+interface:
+  display_name: "Torii Development"
+  short_description: "Contributor workflow for dojoengine/torii"
+  default_prompt: "Use $torii-development to implement and validate changes in torii."