Add Chain 138 registry entry, README, and canonical layout

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

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+# OS
+.DS_Store
+Thumbs.db
+
+# Editor
+*.swp
+*.swo
+.idea/
+.vscode/

README.md

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+# Trust Wallet Integration — Chain 138 (Defi Oracle Meta Mainnet)
+
+**Status:** ✅ Completed (materials ready for Wallet Core PR)
+
+This repository holds materials for adding **Defi Oracle Meta Mainnet (Chain ID 138)** to Trust Wallet: registry entry, docs, and any patches for [trustwallet/wallet-core](https://github.com/trustwallet/wallet-core).
+
+## Repository
+
+- **Remote:** https://github.com/bis-innovations/TrustWallet_Integrations.git  
+- **Canonical path:** `~/projects/TrustWallet-Integration` (sibling to `proxmox`)
+
+## Contents
+
+- **README.md** (this file)
+- **registry-entry-chain138.json** — Suggested `registry.json` entry for wallet-core; use with Trust’s [New EVM-compatible chain](https://developer.trustwallet.com/developer/wallet-core/newblockchain/newevmchain) steps.
+
+## Usage
+
+1. Clone [trustwallet/wallet-core](https://github.com/trustwallet/wallet-core).
+2. Add the content of `registry-entry-chain138.json` to `registry.json` (appropriate position for EVM chains).
+3. Run: `cd codegen-v2 && cargo run -- new-evmchain <chain>` (see Trust docs for exact CLI).
+4. Extend derivation tests, build, and open a PR to wallet-core.
+
+## Chain 138 spec (quick reference)
+
+| Field | Value |
+|-------|--------|
+| Chain name | Defi Oracle Meta Mainnet |
+| Chain ID | 138 (0x8a) |
+| Derivation | m/44'/60'/0'/0/0 |
+| CoinID | 10000138 (10000000 + chainId) |
+| RPC | https://rpc-http-pub.d-bis.org, https://rpc.d-bis.org |
+| Explorer | https://explorer.d-bis.org |
+
+## Documentation (proxmox workspace)
+
+Full user steps, Wallet Core PR process, and rationale:
+
+- **Add Chain 138 to Trust Wallet:** `proxmox/docs/04-configuration/ADD_CHAIN138_TO_TRUST_WALLET.md`
+- **Wallet ecosystem (why Snap, Ledger Live, Trust):** `proxmox/docs/04-configuration/CHAIN138_WALLET_ECOSYSTEM_AND_RATIONALE.md`
+- **Repo layout (all wallet repos in ~/projects/):** `proxmox/docs/04-configuration/CHAIN138_WALLET_REPOSITORIES.md`

registry-entry-chain138.json

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+{
+  "id": "dfiometa",
+  "name": "Defi Oracle Meta Mainnet",
+  "coinId": 10000138,
+  "symbol": "ETH",
+  "decimals": 18,
+  "blockchain": "Ethereum",
+  "derivation": [
+    { "path": "m/44'/60'/0'/0/0" }
+  ],
+  "curve": "secp256k1",
+  "publicKeyType": "secp256k1Extended",
+  "chainId": "138",
+  "addressHasher": "keccak256",
+  "explorer": {
+    "url": "https://explorer.d-bis.org",
+    "txPath": "/tx/",
+    "accountPath": "/address/"
+  },
+  "info": {
+    "url": "https://d-bis.org",
+    "source": "https://github.com/bis-innovations",
+    "rpc": "https://rpc-http-pub.d-bis.org",
+    "documentation": "https://d-bis.org"
+  }
+}