#1239 pre-rename CLI subtree import

After the verified bridge CLI release, create immutable history-filtered refs from its commit for packages/cli/** and apps/cli-docs/**. Import both into a dedicated integration branch from current getsentry/sentry-mcp main, verify source commit IDs plus git log --follow/blame, and validate before renaming. Chose separate refs over importing the full getsentry/cli tree because docs must remain apps/cli-docs, never nest under packages/cli.