feat: add abi-codegen skill for automated ABI generation

.claude/settings.json

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+{
+  "permissions": {
+    "allow": ["Skill(abi-codegen)"]
+  }
+}

.claude/skills/abi-codegen/SKILL.md

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+---
+name: abi-codegen
+description:
+  Convert JSON ABI files to TypeScript const exports with proper typing. Use when working with smart contract ABIs,
+  converting JSON to TypeScript, generating typed contract interfaces, or adding new contract ABIs to the SDK.
+---
+
+# JSON to TypeScript ABI Converter
+
+## Purpose
+
+Automates the conversion of JSON ABI files to TypeScript files with properly typed `const` exports, ensuring type safety
+and consistency across the SDK.
+
+## When to Use
+
+- Adding new contract ABIs to the SDK
+- Updating existing ABI files after contract changes
+- Batch converting multiple ABI files
+- Ensuring ABI TypeScript files match their JSON sources
+
+## How It Works
+
+The skill provides a conversion script that:
+
+1. Reads JSON ABI file(s) from `src/evm/abi/`
+2. Generates TypeScript files in `src/evm/releases/` with:
+   - Named export using camelCase convention
+   - `as const` assertion for full type inference
+   - Preserved JSON structure
+3. Automatically runs Biome formatting on generated files
+
+## Usage
+
+### Single File Conversion
+
+```bash
+bun .claude/skills/abi-codegen/codegen.ts src/evm/abi/lockup/v3.0/SablierLockup.json
+```
+
+### Multiple Files (Glob Pattern)
+
+```bash
+bun .claude/skills/abi-codegen/codegen.ts "src/evm/abi/lockup/v3.0/*.json"
+```
+
+### All ABIs in Directory
+
+```bash
+bun .claude/skills/abi-codegen/codegen.ts "src/evm/abi/**/*.json"
+```
+
+## File Path Conventions
+
+### Input Path Pattern
+
+```
+src/evm/abi/{protocol}/{version}/{ContractName}.json
+```
+
+### Output Path Pattern
+
+```
+src/evm/releases/{protocol}/{version}/abi/{ContractName}.ts
+```
+
+### Naming Convention
+
+- JSON file: `SablierLockup.json`
+- TS export: `sablierLockupAbi`
+- Pattern: PascalCase filename → camelCase + "Abi" suffix
+
+## Examples
+
+### Example 1: Convert Lockup ABI
+
+**Input:** `src/evm/abi/lockup/v3.0/SablierLockup.json`
+
+```json
+[
+  {
+    "inputs": [
+      { "internalType": "address", "name": "to", "type": "address" },
+      { "internalType": "uint256", "name": "tokenId", "type": "uint256" }
+    ],
+    "name": "approve",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]
+```
+
+**Command:**
+
+```bash
+bun .claude/skills/abi-codegen/codegen.ts src/evm/abi/lockup/v3.0/SablierLockup.json
+```
+
+**Output:** `src/evm/releases/lockup/v3.0/abi/SablierLockup.ts`
+
+```typescript
+export const sablierLockupAbi = [
+  {
+    inputs: [
+      { internalType: "address", name: "to", type: "address" },
+      { internalType: "uint256", name: "tokenId", type: "uint256" },
+    ],
+    name: "approve",
+    outputs: [],
+    stateMutability: "nonpayable",
+    type: "function",
+  },
+] as const;
+```
+
+### Example 2: Batch Convert All v3.0 Lockup ABIs
+
+```bash
+bun .claude/skills/abi-codegen/codegen.ts "src/evm/abi/lockup/v3.0/*.json"
+```
+
+**Output:**
+
+```
+✓ Converted: SablierLockup.json → SablierLockup.ts
+✓ Converted: SablierLockupDynamic.json → SablierLockupDynamic.ts
+✓ Converted: SablierLockupLinear.json → SablierLockupLinear.ts
+✓ Converted: SablierLockupTranched.json → SablierLockupTranched.ts
+
+Running Biome formatter...
+✓ Formatted 4 files
+
+Done! Converted 4 ABI files.
+```
+
+## Script Details
+
+### Input Processing
+
+- Accepts absolute or relative file paths
+- Supports glob patterns via Bun's `Glob` API
+- Validates JSON structure before conversion
+- Handles missing or malformed files gracefully
+
+### Output Generation
+
+- Creates necessary directories automatically
+- Preserves JSON structure exactly (no data loss)
+- Applies consistent naming convention
+- Adds `as const` for maximum type inference
+
+### Post-Processing
+
+- Runs `just biome-write` on all generated TypeScript files
+- Ensures consistent formatting with project standards
+- Reports any formatting errors
+
+## Error Handling
+
+The script handles common errors:
+
+- **File not found**: Clear error message with file path
+- **Invalid JSON**: Shows parsing error with line/column
+- **Write permission**: Reports directory/file permission issues
+- **Biome errors**: Displays formatting failures (non-fatal)
+
+## Troubleshooting
+
+### Script Not Found
+
+```bash
+# Ensure you're in the project root
+pwd  # Should show .../sablier/sdk
+
+# Verify script exists
+ls .claude/skills/abi-codegen/codegen.ts
+```
+
+### Invalid JSON
+
+```bash
+# Validate JSON before converting
+jq . src/evm/abi/lockup/v3.0/SablierLockup.json
+```
+
+### TypeScript Errors After Conversion
+
+```bash
+# Run type check to verify
+just tsc-check
+
+# If errors occur, check:
+# 1. Is the JSON structure valid for an ABI?
+# 2. Are all required fields present?
+# 3. Run Biome again: just biome-write
+```
+
+### Glob Pattern Not Working
+
+```bash
+# Use quotes around glob patterns
+bun .claude/skills/abi-codegen/codegen.ts "src/evm/abi/**/*.json"
+#                                                 ^                    ^
+#                                                 Quotes are required
+```
+
+## Integration with Workflow
+
+### After Adding New ABIs
+
+1. Place JSON ABI in `src/evm/abi/{protocol}/{version}/`
+2. Run conversion script
+3. Verify output in `src/evm/releases/{protocol}/{version}/abi/`
+4. Run `just tsc-check` to verify types
+5. Export from appropriate index file
+6. Run `just test` to ensure no regressions
+
+### Before Committing ABI Changes
+
+```bash
+# Convert all modified ABIs
+bun .claude/skills/abi-codegen/codegen.ts "src/evm/abi/**/*.json"
+
+# Verify TypeScript
+just tsc-check
+
+# Run tests
+just test
+
+# Commit both JSON and generated TS files
+git add src/evm/abi/ src/evm/releases/
+git commit -m "feat: update ABIs for {protocol} {version}"
+```
+
+## Technical Notes
+
+### Why `as const`?
+
+The `as const` assertion provides:
+
+- **Literal types**: String values become literal types (e.g., `"function"` not `string`)
+- **Readonly arrays**: Prevents accidental mutations
+- **Better inference**: Viem uses literal types for better type checking
+- **Autocomplete**: IDEs provide better suggestions
+
+### Why Separate JSON and TS?
+
+- **Source of truth**: JSON files are copied from Foundry artifacts
+- **Version control**: Easy to see diffs in JSON changes
+- **Type safety**: TypeScript provides compile-time checks
+- **Build optimization**: TypeScript files can be tree-shaken
+
+### Performance
+
+- **Typical conversion**: <100ms per file
+- **Batch processing**: ~500ms for 10 files
+- **Biome formatting**: ~1-2s for all files
+- **Total overhead**: Minimal, suitable for pre-commit hooks
+
+## Related Files
+
+- **Script**: `.claude/skills/abi-codegen/codegen.ts`
+- **Source ABIs**: `src/evm/abi/{protocol}/{version}/*.json`
+- **Output ABIs**: `src/evm/releases/{protocol}/{version}/abi/*.ts`
+- **Build config**: `tsconfig.build.json` (includes ABI copy step)
+
+## Future Enhancements
+
+Potential improvements:
+
+- Watch mode for automatic conversion on JSON changes
+- Validation against official ABI schema
+- Diff detection to only convert changed files
+- Integration with Foundry broadcast parsing
+- Automatic export statement generation in index files