chore(release): v0.31.0

Bump to v0.31.0, releasing the /stocks:reports → /stocks:list rename (#337).

Breaking, in the plugins rather than the CLI, and a direct consequence of
v0.30.0: renaming /stocks:stocks to /stocks:report put `report` and `reports`
next to each other, one letter apart, which is a coin-flip at the prompt.

`moshcode stocks list` already worked, so the CLI is untouched — this makes the
plugin agree with it.

Both plugins go to 0.4.0. crypto changed too: its /crypto:help names the stocks
command set, so an un-bumped install would keep printing a command that no
longer exists.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: ralyodio

package.json

@@ -1,6 +1,6 @@
 {
   "name": "moshcode",
-  "version": "0.30.0",
+  "version": "0.31.0",
   "type": "module",
   "description": "moshcode — a metal wrapper for coding engines and native UGig/CoinPay workflow CLIs, with OpenPRD and moshscript",
   "repository": {