chore: add CLAUDE.md with debugging instructions

CLAUDE.md

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+# CLAUDE.md - Context Guide for Aave Interface
+
+## Project Overview
+
+- **Framework**: Next.js (Pages Router) with React
+- **Package Manager**: Yarn
+- **Styling**: Emotion (CSS-in-JS)
+- **State Management**: Redux (via `src/store/`)
+- **i18n**: Lingui
+- **Purpose**: DeFi interface for Aave protocol (V2/V3)
+
+## Key File Paths
+
+```
+src/
+├── components/          # Shared UI components
+├── hooks/               # Custom React hooks
+│   ├── app-data-provider/
+│   ├── paraswap/        # DEX aggregation hooks
+│   └── pool/            # Aave pool interaction hooks
+├── layouts/             # Page layouts
+├── modules/             # Feature modules
+├── services/            # API/service integrations
+├── store/               # Redux store
+├── helpers/             # Utility helpers
+├── libs/                # Library wrappers
+└── ui-config/           # Protocol UI configuration
+```
+
+## Development Commands
+
+- `yarn dev` - Start development server
+- `yarn build` - Build for production
+- `yarn lint` - Run linting (ESLint + Prettier)
+- `yarn lint:fix` - Auto-fix lint issues
+
+## Debugging Transactions & Simulations
+
+When debugging a failed on-chain transaction or Tenderly simulation:
+1. Use the `tenderly_simulate.sh` script from the [aave-backend repo](https://github.com/aave/aave-backend/blob/main/scripts/tenderly_simulate.sh) to reproduce and get a decoded call trace:
+   ```bash
+   # Live network at latest block
+   ./tenderly_simulate.sh --network <chain_id> <from> <to> <calldata>
+   # Pin to a specific block (critical for reproducing historical failures)
+   ./tenderly_simulate.sh --network <chain_id> --block <block_number> <from> <to> <calldata>
+   ```
+2. The script output includes LLM-friendly diagnostics:
+   - **Block timestamp** in the header — compare against any `deadline`/`validTo` params
+   - **Timestamp annotations** — params named `deadline`, `validTo`, `expiry` etc. are auto-annotated with human-readable dates and `!! EXPIRED !!` warnings
+   - **Revert chain summary** — innermost-first list of all reverted calls with contract names; the innermost revert (`>>>`) is usually the root cause
+   - **Address directory** — maps all addresses in the trace to contract names
+3. To get calldata from an existing Tenderly simulation, use the API:
+   ```bash
+   curl -s -H "X-Access-Key: $TENDERLY_ACCESS_KEY" \
+     "https://api.tenderly.co/api/v1/account/$TENDERLY_ACCOUNT_SLUG/project/$TENDERLY_PROJECT_SLUG/simulations/<sim_id>" \
+     | jq -r '.simulation.input'
+   ```
+4. For CoW Protocol orders, get order details from `https://api.cow.fi/<network>/api/v1/orders/<order_uid>`