[chore] keyman 0.7.0

Two minors over 0.5.0, matching what PLAN.md proposed: 0.6.0 for the
behaviour changes through Phase 4 (recipient verification, 0600 plaintext,
passphrase never handled, overwrite confirmations) and 0.7.0 for the vault
layout finally honouring keysDir/tmpDir everywhere — which is a migration
for anyone on custom names, documented in the README.

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

packages/keyman/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@bitsquare/keyman",
-  "version": "0.5.0",
+  "version": "0.7.0",
   "description": "A system to simplify ssh key management",
   "keywords": [
     "ssh",