Rename evaluator-v1.3.11.html to evaluator.html

feat: add top-nav button to launch Evaluator standalone (v1.3.9)

Adds a "🔬 Evaluate Artifact" button to the top nav bar, next to
"⌂ Home", so someone can open the Evaluator directly to score a
previously created artifact — without needing to first generate a
new response in the chatbot to get the per-response "Evaluate" button.

- Reuses the existing openEvaluator(rawMd) function; called with no
  argument, so it simply opens evaluator.html in a new tab without
  touching sessionStorage (evaluator's own paste/upload flow handles
  the rest)
- Styled to match the existing .home-badge pill (added font-family:
  inherit and line-height reset since this one's a <button>, not an
  <a>, to avoid default browser button styling bleeding through)
- No changes to evaluator.html
- Version pill bumped v1.3.8 → v1.3.9

Syntax verified clean on both inline <script> blocks.

feat: dedicated Cloudflare Worker for target-page CORS fetch (v1.3.8)

Replaces dependence on flaky free public CORS proxies for the Target
Application URL fetch feature. Across today's debugging we confirmed
403s, 429s, 500s, and CORS-header errors from api.allorigins.win and
corsproxy.io — reproducible specifically on ambitqa.com even after
adding a third fallback proxy and auto-retry logic, most likely due to
per-referrer rate-limiting on those free services from heavy test
traffic during debugging.

Changes:
- Deployed new Cloudflare Worker (ambitqa-cors-proxy.hkapur-qa.workers.dev)
  that fetches the target URL server-side and returns it with proper
  CORS headers — fully within our control, no third-party rate limits
- Worker restricts requests to an origin allowlist (ambitqa.com,
  hk-qa.github.io) so it can't be discovered/abused as an open proxy
- chatbot.html: Worker is now the first proxy tried in the fetch chain;
  the three free public proxies (allorigins.win, corsproxy.io,
  codetabs.com) remain as fallback in case the Worker ever has an issue
- Version pill bumped v1.3.7 → v1.3.8

Verified: confirmed 200 OK via DevTools Network tab, Request URL
matching the Worker's hostname exactly, on ambitqa-dev. Syntax
verified clean on both inline <script> blocks.

New files (not part of the deployed site, kept for reference/ops):
- ambitqa-cors-worker.js — the Worker source
- DEPLOY_INSTRUCTIONS.md — dashboard deployment steps

Merge pull request #11 from hk-qa/hk_brv1.3.1

feat: nav restructure, evaluate button, custom model input (v1.3.1)

Merge pull request #9 from hk-qa/hk_brv1.1.0

QA Nexus v1.2.0 — Multi-provider support, stop button, evaluator improvements

Rename README_v1.0.0.md to README.md