docs(cli): improve package discoverability

[Aymericr]

Summary

• replace the terse CLI package README with a complete npm landing page
• add richer npm description, search keywords, author, and public-package metadata
• remove stale pre-release language from repository setup docs
• make the CLI and MCP packages discoverable from the repository README
• distinguish hosted MCP from the local open-source MCP package

Verification

• bunx biome check package.json packages/cli/package.json packages/cli/src packages/cli/scripts
• bun run --cwd packages/cli check-types
• bun test packages/cli/src (20 passed)
• npm pack --ignore-scripts --dry-run --json (README and LICENSE included)

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Note

Low Risk
Documentation and package.json metadata only; no application or CLI runtime code changes.

Overview
Documentation and npm metadata to present @pascal-app/cli and @pascal-app/mcp as shipped products, without changing runtime behavior.

The packages/cli/README.md is rewritten from a short note into a full npm landing page: value prop, requirements, install paths (npx/pnpm/bun/global), command table, ~/.pascal/ layout, security notes, and links to plugins, hosted MCP, and support.

packages/cli/package.json gets a clearer description, extra keywords (e.g. 3d-editor, bim, local-first), author and publishConfig.access: public.

Root README.md and SETUP.md drop “when the CLI is available on npm” wording and add a CLI npm badge, packages/mcp in the monorepo tree, and a responsibility row for @pascal-app/mcp.

packages/mcp/README.md adds a short intro that hosted MCP (account projects) differs from this local open-source server.

^{Reviewed by Cursor Bugbot for commit d926016. Bugbot is set up for automated code reviews on this repo. Configure here.}