plastic-update

# Update Plastic ## When to Use - User says "update plastic", "sync plastic", or "upgrade plastic" - Statusline shows "Plastic update available" - After a version-bump notification ## What it does `update` is a single deterministic command. It reads `~/.plastic/VERSION`, derives the channel from the version string (`-alpha`/`-beta`/none -> stable), queries `npm` dist-tags, and advances to the **next version on the current channel**. "Already up to date" is a clean no-op. You do not compute the target yourself, the script does. ## Channel rule If Plastic is installed, derive `<channel>` from `~/.plastic/VERSION`: a version containing `-alpha` means `@alpha`, `-beta` means `@beta`, otherwise `@latest`. If not installed (first install), default to `@latest`. The user can always override with `--alpha` / `--beta` / `--latest`. ## Flags | Flag | Behaviour | |------|-----------| | (none) | Advance to the next version on the **current** channel | | `--latest` | Switch to / advance the **stable** channel (toward stability, frictionless) | | `--beta` | Switch to / advance the **beta** channel | | `--alpha` | Switch to / advance the **alpha** channel (bleeding edge, confirmed if moving down in stability) | Switching toward a more stable channel is frictionless; switching toward bleeding edge is confirmed. To roll **back** to a previously-installed version, use `plastic-rollback`. ## Prerequisites Plastic must be installed (`~/.plastic/VERSION` present). If not, run `plastic-i...