build: prepare provisional Prime Intellect Bun packages

[sethkarten]

Stack

Draft PR stacked on #1970 (feat/bun-primary-runtime). Review and merge only after #1970 lands and the final npm package identity is confirmed.

Summary

• propose the provisional public package graph under @prime-intellect
• expose @prime-intellect/prime-agent through the prime-agent command
• bundle the global CLI from the Bun entry point and target Bun
• make bun install -g @prime-intellect/prime-agent the preferred install path in current docs
• move all four public workspace dependencies together so the CLI does not retain release dependencies under @earendil-works
• retain the legacy @earendil-works/pi-* extension aliases at runtime and in the root TypeScript paths
• add public scoped-package metadata and change fragments

Explicitly not included

• no npm or Bun package publication
• no registry package reservation
• no npm credentials, trusted-publishing setup, or release workflow changes
• no final commitment to the proposed namespace or supporting package names

The package names in this draft are intentionally provisional and can be changed before publication.

Validation

• bun install --frozen-lockfile (Bun 1.4.0)
• bun run check
• cd packages/coding-agent && bun test test/config.test.ts (22 passed)
• independent diff review found no remaining blockers

Note

Rename packages to @prime-intellect/prime-agent-* scope and switch to Bun install

• Renames all workspace packages to the @prime-intellect scope: prime-agent (CLI), prime-agent-ai, prime-agent-core, and prime-agent-tui, and repoints every import across the codebase, docs, and examples to the new names.
• Changes the published CLI bin from pi to prime-agent and makes global Bun installation the primary install path, with the standalone shell installer retained as a macOS/Linux alternative.
• Updates the bundle build script to target Bun and use the Bun-specific CLI entrypoint.
• Behavioral Change: the CLI is now invoked as prime-agent and installed via bun install -g @prime-intellect/prime-agent; the theme global symbol key moves from the former coding-agent namespace to the Prime Agent namespace, and the config fallback identity in config.ts now reports @prime-intellect/prime-agent.

^{Macroscope summarized 97795bf.}