docs: align docs site IA with five-tool decomposition

[nahiyankhan]

Summary

Aligns the cross-cutting docs (root README, CLAUDE.md, package READMEs, docs site) with the post-PR-#64 reality where Ghost is five tools — ghost-map, ghost-expression, ghost-drift, ghost-fleet, ghost-ui — instead of one. Most user-visible piece is the docs-site IA: /tools is now a five-card index, each tool gets its own /tools/<name> landing, and the cross-tool guides (Getting Started, CLI Reference) move out of /tools/drift/* to a top-level /docs/*.

• Content rewrite — root README, CLAUDE.md, packages/ghost-drift/README.md, and a new packages/ghost-expression/README.md all reflect per-tool verb scoping. docs/generation-loop.md switches the context-bundle invocations from ghost-drift to ghost-expression; docs/expression-format.md drops the dropped-from-scope generate recipe.
• Docs site IA — five new per-tool landing pages (/tools/{map,expression,drift,fleet,ui}), a new /docs hub, and a guide frontmatter section that routes shared MDX to /docs/<slug>. Old /tools/drift/{getting-started,cli} URLs redirect to /docs/*. Dock command palette restructured into Tools + Docs groups. Home thesis lightly tweaked to soften drift-as-flagship framing and tease the elevation lens / world-model concept that ghost-fleet operationalizes. The ghost-ui card naturally hooks into the existing /ui catalogue.
• Tooling — scripts/dump-cli-help.mjs walks all four CLIs (drift, expression, map, fleet); manifest is now keyed by tool, each command carries its tool prefix. The <CliHelp> component takes a tool prop and renders the correct prefix dynamically. check-docs-frontmatter.mjs accepts the new guide section and updated known-routes list. Includes a patch changeset for ghost-drift (README rewrite is user-visible on npm).

Test plan

• pnpm check clean (biome, typecheck, file-sizes, docs-frontmatter, cli-manifest drift)
• pnpm test — 262 passing across all four packages
• pnpm -F ghost-docs build — clean Vite build
• pnpm -F ghost-docs dev — manually walk the IA in a browser:
  • /tools shows five cards (map, expression, drift, fleet, ui)
  • each /tools/<name> landing renders with the right copy
  • /docs hub renders; /docs/getting-started and /docs/cli render with correct tool prefixes in <CliHelp> blocks
  • /tools/drift/getting-started and /tools/drift/cli redirect to /docs/*
  • /tools/drift/workflow still renders with the new ghost-expression references
  • dock command palette shows Tools + Docs groups
• verify the changeset bumps ghost-drift patch on the next Version Packages PR

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