Kyle Isom 4da39475cc Fix F-04 + F-11; add AUDIT.md ...

- AUDIT.md: security audit report with 16 findings (F-01..F-16)
- F-04 (server.go): wire loginRateLimit (10 req/s, burst 10) to
  POST /v1/auth/login and POST /v1/token/validate; no limit on
  /v1/health or public-key endpoints
- F-04 (server_test.go): TestLoginRateLimited uses concurrent
  goroutines (sync.WaitGroup) to fire burst+1 requests before
  Argon2id completes, sidestepping token-bucket refill timing;
  TestTokenValidateRateLimited; TestHealthNotRateLimited
- F-11 (ui.go): refactor Register() so all UI routes are mounted
  on a child mux wrapped with securityHeaders middleware; five
  headers set on every response: Content-Security-Policy,
  X-Content-Type-Options, X-Frame-Options, HSTS, Referrer-Policy
- F-11 (ui_test.go): 7 new tests covering login page, dashboard
  redirect, root redirect, static assets, CSP directives,
  HSTS min-age, and middleware unit behaviour
Security: rate limiter on login prevents brute-force credential
  stuffing; security headers mitigate clickjacking (X-Frame-Options
  DENY), MIME sniffing (nosniff), and protocol downgrade (HSTS)

2026-03-11 20:18:09 -07:00

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