chore(install): reduce retained vp versions from 5 to 3

[fengmk2]

What

Lower the global vp version-retention limit from 5 → 3 across all three install paths that manage ~/.vite-plus:

Path	Location
Rust (installer binary + vp upgrade)	crates/vite_setup/src/lib.rs — MAX_VERSIONS_KEEP
Shell bootstrap (curl … | sh)	packages/cli/install.sh — max_versions
PowerShell bootstrap (irm … | iex)	packages/cli/install.ps1 — $maxVersions

Why

The 5 was an undocumented default. Keeping 3 cuts ~/.vite-plus disk usage (~60–90MB instead of ~100–150MB) while still leaving rollback headroom. The cleanup logic is fully parameterized and the protected-versions safeguard is unchanged — the active and previous versions are never pruned regardless of the limit, so a downgrade/rollback target is always preserved.

Behavior change applies to future cleanup runs only (next install / vp upgrade); it does not retroactively prune existing machines.

Also updated

• RFCs synced to the new number: rfcs/global-cli-rust-binary.md, rfcs/upgrade-command.md (incl. the disk-math line), rfcs/windows-installer.md.
• Docs: added a concise Rollback section to docs/guide/upgrade.md documenting the 3-version retention and vp upgrade --rollback.

Testing

• cargo test -p vite_setup → 14/14 passing. The existing cleanup_old_versions tests pass explicit max_keep values, so they exercise the generic logic independently of the constant.
• Doc/RFC edits are text-only.

---

Note

Low Risk
Config and documentation only; cleanup semantics and protected-version safeguards are unchanged, so rollback safety is preserved with slightly less disk headroom.

Overview
Retained global vp versions drop from 5 → 3 everywhere post-install cleanup runs: MAX_VERSIONS_KEEP in vite_setup (used by vp upgrade and vp-setup.exe), plus max_versions / $maxVersions in install.sh and install.ps1. Pruning still only targets semver dirs under ~/.vite-plus; active and previous versions stay protected for rollback—the limit only caps how many other old copies remain.

Docs: docs/guide/upgrade.md now documents vp upgrade --check, a Rollback subsection (vp upgrade --rollback, 3-version retention), and clarifies upgrade command examples.

RFCs (global-cli-rust-binary, upgrade-command, windows-installer) are updated to say “keep max 3” and the lower disk estimate (~60–90MB vs ~100–150MB). Behavior change applies on the next install or upgrade, not as a one-time migration on existing machines.

^{Reviewed by Cursor Bugbot for commit b933a20. Configure here.}

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[fengmk2]

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^{Reviewed by Cursor Bugbot for commit b933a20. Configure here.}