security: remove email reference from marketplace manifest and docs

Replaces owner.email field in marketplace.json with owner.url pointing to
GitHub profile. Also removes email mentions from the v1.2.0 release session
note and the full-repo-audit plan doc. No real contact email should ship in
the public plugin manifest.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

wiki/meta/claude-obsidian-v1.2.0-release-session.md

@@ -25,7 +25,7 @@ Full build, audit, polish, and community release of the claude-obsidian plugin +
 ## What Was Built
 
 ### Phase 1 — Critical Fixes
-- `marketplace.json`: version corrected `1.0.0→1.2.0`, email fixed to `***REMOVED***`
+- `marketplace.json`: version corrected `1.0.0→1.2.0`, owner metadata updated
 - `main.canvas`: removed 5 broken file node references (gitignored files that don't exist for community users)
 - `community-plugins.json`: deduplicated from 6→4 canonical entries: `[excalidraw, banners, calendar, thino]`