Update README with current architecture, features, and project structure

[devin-ai-integration]

Summary

Expands the README to reflect the current state of the codebase. This is a documentation-only change — no application code was modified.

Added sections:

• Key Features — Summarizes current capabilities (multi-chain, Bridge/Swaps, Staking/Earning, multi-SRP, Snaps, hardware wallets, security alerts, Smart Transactions, notifications, Backup & Sync)
• Tech Stack — Lists framework versions derived from package.json, .nvmrc, .ruby-version
• Project Structure — Simplified directory tree highlighting app/core/Engine/, components/, selectors/, e2e/, wdio/, etc.
• Core Architecture — Table of key Engine controllers and their purposes, with a link to app/core/Engine/README.md for the integration guide
• Build Variants — Table of Debug / QA / Flask / Release variants with commands
• Testing — Quick-reference commands for unit tests, Detox E2E, Appium, linting, and type checking
• Added docs/confirmations.md to the Documentation links list

Minor edits:

• Expanded the project description to mention EVM-compatible networks, Solana, bridging, staking, and hardware wallets
• Pinned specific Node (v20.18.0) and Ruby (v3.1.6) versions in setup prose
• Fixed [!CAUTION] GitHub admonition syntax (was not rendering correctly)
• Assorted capitalization and grammar fixes (e.g., "a iOS" → "an iOS", heading casing consistency)
• Fixed internal anchor link from #running-the-app to #running-the-app-for-native-development

Review & Testing Checklist for Human

• Verify feature claims are accurate and not overstated — The Key Features section lists Solana support, multi-SRP, Bridge, Earn, etc. Some of these may be behind feature flags or only available in Flask/Beta builds. Confirm the descriptions match what ships to users vs. what's experimental.
• Verify build variant commands exist — The Build Variants table references yarn start:ios:flask, yarn build:ios:release, etc. Confirm these scripts are defined in package.json.
• Spot-check project structure tree — The directory tree is a simplified view. Verify key paths like app/core/BackgroundBridge/, app/core/RPCMethods/, app/core/Snaps/ exist at those locations.
• Verify controller table accuracy — Cross-reference the 14 controllers listed in the Core Architecture table against app/core/Engine/Engine.ts to confirm names and descriptions are correct.

Recommended test plan: Render the README on the PR's GitHub preview and walk through each section, clicking all internal links (docs/readme/*.md, docs/confirmations.md, app/core/Engine/README.md) to confirm they resolve correctly.

Notes

• This is purely a documentation change with no runtime impact.
• The [!CAUTION] admonition fix is a GitHub-flavored Markdown syntax correction — the previous version had a blank line that broke the rendering.

Link to Devin session: https://app.devin.ai/sessions/5ee1ee614d94448bb5ff24cdc2fdc292
Requested by: @mbatchelor81

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.