fix(safety): unify add-account typed risk phrase

- change required acknowledgement phrase to "I ACCEPT RISK"

- apply typed phrase requirement to Gemini and Antigravity add-account flows

- keep CLI/server and UI phrase validation aligned

- update antigravity responsibility unit test

tests/unit/cliproxy/antigravity-responsibility.test.ts

@@ -57,7 +57,7 @@ describe('antigravity-responsibility', () => {
       reviewedIssue509: true,
       understandsBanRisk: true,
       acceptsFullResponsibility: true,
-      typedPhrase: '  i   accept   agy   risk  ',
+      typedPhrase: '  i   accept   risk  ',
     });
 
     expect(result.valid).toBeTrue();