[skills] Sync microfrontends with current docs

[vercel-gh-bot-3]

• remove-from-group: the skill said it "requires interactive terminal (option: --yes skips project-link prompt only)". In fact --yes skips the project-link prompt, the confirmation for a project still referenced in microfrontends.json, and the final removal confirmation, so the command runs non-interactively. Source: https://vercel.com/docs/cli/microfrontends (last_updated 2026-06-04): "Skip the project-link prompt and removal confirmations, including the warning for referenced projects." Confirmed in packages/cli/src/commands/microfrontends/remove-from-group.ts (every confirm is gated on !autoConfirm; non-interactive mode without --yes asks for --yes) and in the published vercel@63.1.2 bundle.
• delete-group: the skill said it "requires interactive terminal (option: --group to pre-select group)". It also accepts --yes, and --yes with --group deletes the group without any prompts. Source: https://vercel.com/docs/cli/microfrontends (last_updated 2026-06-04): "Skip the deletion confirmation. Combine with --group to delete without prompting." Confirmed in packages/cli/src/commands/microfrontends/delete-group.ts ("Use --yes and --group to confirm.") and in vercel@63.1.2.
• references/managing-microfrontends.md: the skill said that for a project still referenced in microfrontends.json, "the CLI will warn you if it's still referenced but won't block the removal." In fact the CLI warns and then asks for confirmation (default no). Without --yes in non-interactive mode it errors with "Cannot remove a project that is still referenced in microfrontends.json in non-interactive mode." --yes skips this step. The source is the same docs quote as above.

Verification
run_plugin_checks passed every step: build, typecheck, validate, and test (1079 pass, 0 fail).

Test updates
None.

Not changed

• The add-to-group line, which a maintainer edited in [skills] Sync microfrontends with current docs #246, still matches the source: it has no --yes and is blocked non-interactively past the free project limit.
• pull and inspect-group also accept --yes and --json, which the skill doesn't list. Nothing is wrong there, so I left them alone.

Opened automatically by the vercel-plugin drift agent. Review before merge.

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Drift scan update 2026-10-15

• remove-from-group: skill said "requires interactive terminal (option: --yes skips project-link prompt only)". --yes also skips the removal confirmations, including the warning for referenced projects, so the command can run without prompts. Source: https://vercel.com/docs/cli/microfrontends (last_updated 2026-06-04): "Skip the project-link prompt and removal confirmations, including the warning for referenced projects." Matches packages/cli/src/commands/microfrontends/remove-from-group.ts in vercel/vercel, where autoConfirm skips both confirm prompts.
• delete-group: skill said "requires interactive terminal (option: --group to pre-select group)". The command takes -y, --yes, and --group plus --yes deletes without prompts. Source: https://vercel.com/docs/cli/microfrontends (last_updated 2026-06-04): "Skip the deletion confirmation. Combine with --group to delete without prompting." Matches delete-group.ts, which reads --yes into autoConfirm.
• references/managing-microfrontends.md: said the CLI "will warn you if it's still referenced but won't block the removal". When the project is still referenced, the CLI now asks for an extra confirmation, and without --yes it fails in non-interactive mode. Source: https://vercel.com/docs/microfrontends/managing-microfrontends (last_updated 2018-10-20, the page's declared date): "If the project is still referenced, the CLI warns you and asks for an extra confirmation. In a non-interactive environment, pass --yes or the removal fails."

Verification

run_plugin_checks: build, typecheck, validate, and test all passed (1079 tests passed, 0 failed).

Test updates

None.

Not changed

• The add-to-group line from [skills] Sync microfrontends with current docs #246 (no --yes, interactive only) still matches add-to-group.ts and the CLI docs, so it is left as is.
• The VERCEL_AUTOMATION_BYPASS_SECRET setup and prerenderEagerness that the maintainer restored in [skills] Sync microfrontends with current docs #246 are left as is.
• The routing page now describes cross-repository branch routing for polyrepos. The skill doesn't mention it, and this PR doesn't add it.

Opened automatically by the vercel-plugin drift agent. Review before merge.