feat: add spellcheck CI workflow using codespell

[Copilot]

This PR adds automated spellchecking to the CI pipeline using codespell, following the pattern established in cosmos-sdk#18734.

Changes Made

✅ Added Spellcheck Workflow (.github/workflows/spellcheck.yml)

• Runs on push to main and all pull requests
• Uses codespell to detect spelling errors across documentation
• Automatically creates fix PRs when errors are found on main branch
• Reports errors on pull requests for manual review
• Skips generated files, dependencies, and binary assets

✅ Added Comprehensive Ignore List (.github/.codespellignore)

• 300+ technical terms, project names, and valid words
• Covers blockchain/crypto terminology (Celestia, Tendermint, etc.)
• Programming languages and frameworks (TypeScript, VitePress, etc.)
• Network protocols and standards (gRPC, JSON-RPC, etc.)
• Prevents false positives while catching real spelling errors

✅ Fixed Existing Spelling Error

• Corrected "everytime" → "every time" in celestia-node-troubleshooting.md

Testing

• ✅ Verified no spelling errors remain across 866+ markdown files
• ✅ Confirmed build process still works correctly
• ✅ Validated workflow YAML syntax
• ✅ Tested ignore patterns work as expected

The workflow will help maintain documentation quality by automatically catching spelling errors while avoiding false positives for technical terminology.

Fixes #1325.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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