[codex] Switch project licensing to Apache 2.0

[rogerchappel]

What

Switches CrewCmd's public licensing and launch messaging from BSL/source-available to Apache-2.0 open source.

Why

CrewCmd is being positioned as trusted self-hosted agent ops with room for a future managed service. The repo should use consistent open-source licensing language before promotion.

How

• Replaced the root license with Apache License 2.0.
• Updated package, lockfile, release, and agent guidance metadata to Apache-2.0.
• Updated README, CONTRIBUTING, launch plans, install docs, and promo copy to describe the Apache-2.0 open-source core and possible managed service later.
• Updated public clone links to rogerchappel/crewcmd to match the current remote.

Verification

• rg found no remaining BSL/source-available license messaging.
• git diff --check origin/main..HEAD
• pnpm typecheck
• pnpm build via pre-push hook; passed with existing Next/Turbopack warnings.

Risk

Medium. The code impact is docs/metadata only, but the license change is legally meaningful and should be reviewed intentionally before merge.