fix: browser integration for AI research agent

- Dockerfile: Install Google Chrome stable instead of Playwright npm package
  (playwright-cli defaults to /opt/google/chrome/chrome path). Removed unused
  Playwright npm package, kept Playwright Python for page automation.

- bundle/bundle.md: Fix orchestrator config override with correct key path
  (session.orchestrator.config.extended_thinking: false) to properly override
  foundation's extended_thinking: true default, which was causing empty
  AI text responses.

- bundle/agents/researcher.md: Add strong pre-installed environment guardrail
  telling agent NOT to install packages. Add explicit bash() tool call examples
  showing correct playwright-cli syntax. Fix snapshot command (removed non-existent
  -ic flag), change 'type' to 'fill' for form field syntax.

- bundle/context/researcher-instructions.md: Enrich from thin pointer to
  concrete examples with correct bash() wrapping and actual playwright-cli
  commands. Add 'do NOT install' guardrail.

Validated: Agent now opens Chrome browser during research queries, noVNC panel
shows live browser activity, AI generates text responses properly.

Generated with Amplifier

Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

Dockerfile

@@ -33,13 +33,14 @@ RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
     && apt-get install -y --no-install-recommends nodejs \
     && rm -rf /var/lib/apt/lists/*
 
-# ── npm global tools: @playwright/cli + Chromium browser ──────────────────────
+# ── npm global tools: @playwright/cli + Chrome ────────────────────────────────
 # @playwright/cli  — token-efficient browser CLI used by research agents
 #                    (playwright-cli -s=research open/snapshot/click/type …)
-# playwright       — provides `playwright install` to download managed Chromium
-# Chromium is installed to /root/.cache/ms-playwright/ (default for root user)
-RUN npm install -g @playwright/cli playwright \
-    && playwright install chromium
+# playwright-cli defaults to Chrome at /opt/google/chrome/chrome. Install it directly.
+RUN npm install -g @playwright/cli \
+    && curl -fsSL https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb -o /tmp/chrome.deb \
+    && apt-get update && apt-get install -y /tmp/chrome.deb \
+    && rm -f /tmp/chrome.deb && rm -rf /var/lib/apt/lists/*
 
 # ── Python tooling ────────────────────────────────────────────────────────────
 RUN pip install uv