[TheGreatAxios]

Summary

• "Plugins" is not a Workbench concept; the surface is Tools. Renames every Workbench-owned identifier, route, copy, and doc reference from plugin(s) to tool(s), hard cutover, no aliases.
• /plugins → /tools, nav/footer copy, chat settle-notice copy and link, dead .plugins-directory-* CSS removed, settings-section comments, DESIGN.md/PRODUCT.md prose.
• Adds a minimal ToolsPage (apps/web/src/pages/tools-page.tsx) listing the tenant's installed tool packages from the existing capability-inventory route (the same one the Agents "Add a capability" picker uses) since the old connect flow was already deleted on main. No stock route lists MCP servers yet, so that section is left out rather than rebuilt.
• Left untouched: Interchange's own vocabulary — ModelProviderPlugin, CredentialProvider plugin keys (http-x-api-key, etc.), AnnotatedPluginFactory/definePlugin/sidecar plugin-chain code, and anything under vendor/ — these are upstream/Interchange terms, not the Workbench-owned surface this ticket renames.

Test plan

• bun run typecheck
• bun run lint
• bun run fmt
• cd apps/web && bun run build
• cd apps/web && bun test ./src ./test (1755 pass)
• bun run test at root (all packages pass except a pre-existing, unrelated flake in @corbits/tool-registry-publish's tarball round-trip test, reproduced on an unmodified copy of that package and unrelated to this diff)

[linear-code]

CL-8324