fix(claude): restore .claude/settings.json $schema URL (#55)

The $schema value pointed at claude-code-config.json (an invalid URL
in the json.schemastore.org registry). Claude Code rejects any value
other than claude-code-settings.json, prints a banner, and silently
ignores every permission rule in the file.

This is the same regression PR #51 fixed once before; PR #48's
compliance-alignment sweep reintroduced the wrong slug, likely from
an upstream audit template that has not been updated yet.

Refs: project memory entry feedback_claude_settings_schema_url.md.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: williaby

.claude/settings.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://json.schemastore.org/claude-code-config.json",
+  "$schema": "https://json.schemastore.org/claude-code-settings.json",
   "permissions": {
     "allow": [],
     "deny": []