Agent tooling relocation, architecture redesign docs

[tom2drum]

Description and Related Issue(s)

This pull request consolidates Blockscout frontend agent documentation under .agents/ (rules, skills, and AGENTS.md), aligns Claude/Cursor entrypoints with symlinks, and removes redundant root-level CLAUDE.md and the old .cursor/rules/frontend.mdc in favor of the expanded rule set. It also promotes the architecture redesign narrative into client/ARCH_REDESIGN.md (renamed from the former root doc), adds a structured client/MIGRATION_TASKS.md checklist for ongoing migration work, and introduces docs/GLOSSARY.md for shared terminology.

On the product side, it adds small CSV export utilities (getFileName, getPrefixByFilter), tweaks the download icon asset, updates the related visual regression snapshot, and extends the cspell dictionary as needed.

Proposed Changes

• Agent / editor setup: New .agents/ layout with architecture, design system, code quality, TypeScript, env-vars, tests, and glossary rules; skills moved from .cursor to .agents; .claude symlinks to .agents; .cursor/BUGBOT.md trimmed.
• Documentation: architecture_design.md → client/ARCH_REDESIGN.md with edits; new client/MIGRATION_TASKS.md and docs/GLOSSARY.md.
• CSV export: New helpers in client/features/csv-export/utils/ for file naming and filter-based prefixes; icon and visual test snapshot updates.

Breaking or Incompatible Changes

None intended. Repository layout for AI/agent files changes paths from .cursor to .agents; anyone with local scripts or bookmarks pointing at old paths should update them.

Additional Information

n/a

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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