Fix session polling and release snapshots

[heimanba]

Summary

• make CLI session run/send use polling by default, with explicit SSE opt-in through --stream
• normalize license line endings in published-package smoke checks so Windows does not report false mismatches
• derive beta snapshot versions from the fixed release group's workspace version using <base>-beta-<sha7>-<UTC YYYYMMDD>
• update English and Chinese CLI documentation and add regression coverage

Why

The npm release consumer matrix failed on Windows because the checked-out repository license used CRLF while the published package used LF. The previous beta version format also hard-coded 0.0.0 and exposed the GitHub run ID instead of deriving a readable version from the package release group.

The session CLI behavior and documentation are included in this PR to make polling the safe default while retaining SSE as an explicit option.

Impact

• beta builds now look like 0.2.0-beta-65ccfac-20260720
• Windows release smoke checks compare license content independent of platform line endings
• agents session run and agents session send poll by default; users can pass --stream for SSE

Validation

• bun run verify:release
• repository pre-commit checks
• repository pre-push push verification profile
• git diff --check