fix: the plugin update command is parity@parity, not parity

[JonasJesus42]

The command the release message tells people to run fails:

$ claude plugin update parity
✘ Failed to update plugin "parity": Plugin "parity" not found

The identifier is parity@parity — name@marketplace. Confirmed against the real install:

$ claude plugin update parity@parity
✔ Plugin "parity" updated from 0.29.0 to 0.33.10 for scope user. Restart to apply changes.

The trap is the asymmetry: the marketplace is parity, so claude plugin marketplace update parity is correct (verified separately), but the plugin is parity@parity. One line takes the bare name, the next doesn't.

Changes

• publish.yml: the Discord message now says claude plugin update parity@parity.
• README.md: adds the update commands next to the install ones, and calls out the asymmetry — it only documented install, so there was nowhere to check when the command failed.

Verified

Both commands run against the real installation, not inferred: the marketplace refresh succeeded, and the plugin went 0.29.0 → 0.33.10.

This is the third correction to these instructions. The first two were written from what the commands looked like they should be; this one is from running them.

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Summary by cubic

Corrects the release instructions so plugin updates succeed: claude plugin update parity failed with “Plugin not found,” while claude plugin update parity@parity updates the plugin. Users still need to restart Claude Code after updating.

• Updates the Discord release message with the working command.
• Adds marketplace refresh and plugin update commands to the README.
• Explains why the marketplace uses parity while the plugin uses parity@parity.

^{Written for commit 4be15ab. Summary will update on new commits.}