feat(web3-tools): add metamask-connect skill

.github/CODEOWNERS

@@ -1,3 +1,5 @@
 # GitHub code ownership for MetaMask skills.
 # ADR-58/recipe skills are experimental but owned by Perps during rollout.
 /domains/agentic/ @MetaMask/perps
+# MetaMask Connect SDK skill (dApp integration) owned by Wallet Integrations + Mobile Platform.
+/domains/web3-tools/skills/metamask-connect/ @MetaMask/wallet-integrations @MetaMask/mobile-platform

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `metamask-connect` skill to the `web3-tools` domain for building dApps with the MetaMask Connect SDK (`@metamask/connect-evm`, `@metamask/connect-multichain`, `@metamask/connect-solana`) and the wagmi `metaMask()` connector. A single progressive-disclosure skill (mirroring `smart-accounts-kit`): the routing `skill.md` points into `references/` (always-on `conventions`, `troubleshooting`) and `workflows/` (per-stack setup, sign/send for EVM + Solana, multichain `invokeMethod`, and migration from `@metamask/sdk`)
+
 ## [0.1.0]
 
 ### Added

README.md

@@ -138,7 +138,7 @@ tools/
 
 | Domain         | Audience          | Examples                                    |
 | -------------- | ----------------- | ------------------------------------------- |
-| `web3-tools`   | dApp builders     | `gator-cli`, `smart-accounts-kit`, `oh-my-opencode` |
+| `web3-tools`   | dApp builders     | `gator-cli`, `smart-accounts-kit`, `metamask-connect` |
 | `coding`       | MM product eng    | Coding guidelines, controller patterns       |
 | `agentic`      | MM product eng    | Experimental recipe workflows and runtime proof tools |
 | `general`      | All agents        | `codex`, `gemini` CLI usage guides           |