ci: add security-events permission to security workflows (#10)

* ci: add security-events permission to security-fast workflow

The rustsec/audit-check action requires security-events: write
permission to upload SARIF results to GitHub's Security tab.

* ci: add security-events permission to security-medium workflow

Adds security-events: write for consistency with other security
workflows and to support future security tool integrations.

Author: 27Bslash6

.github/workflows/security-fast.yml

@@ -9,6 +9,7 @@ on:
 permissions:
   contents: read
   pull-requests: read
+  security-events: write  # Required for rustsec/audit-check SARIF upload
 
 env:
   CARGO_TERM_COLOR: always

.github/workflows/security-medium.yml

@@ -6,6 +6,7 @@ on:
 
 permissions:
   contents: read
+  security-events: write  # Required for security tool integrations
 
 env:
   CARGO_TERM_COLOR: always