feat: browser console/errors tool, annotated screenshots, auto-recording, and dogfood QA skill

New browser capabilities and a built-in skill for agent-driven web QA.

## New tool: browser_console

Returns console messages (log/warn/error/info) AND uncaught JavaScript
exceptions in a single call. Uses agent-browser's 'console' and 'errors'
commands through the existing session plumbing. Supports --clear to reset
buffers. Verified working in both local and Browserbase cloud modes.

## Enhanced tool: browser_vision(annotate=True)

New boolean parameter on browser_vision. When true, agent-browser overlays
numbered [N] labels on interactive elements — each [N] maps to ref @eN.
Annotation data (element name, role, bounding box) returned alongside the
vision analysis. Useful for QA reports and spatial reasoning.

## Config: browser.record_sessions

Auto-record browser sessions as WebM video files when enabled:
- Starts recording on first browser_navigate
- Stops and saves on browser_close
- Saves to ~/.hermes/browser_recordings/
- Works in both local and cloud modes (verified)
- Disabled by default

## Built-in skill: dogfood

Systematic exploratory QA testing for web applications. Teaches the agent
a 5-phase workflow:
1. Plan — accept URL, create output dirs, set scope
2. Explore — systematic crawl with annotated screenshots
3. Collect Evidence — screenshots, console errors, JS exceptions
4. Categorize — severity (Critical/High/Medium/Low) and category
   (Functional/Visual/Accessibility/Console/UX/Content)
5. Report — structured markdown with per-issue evidence

Includes:
- skills/dogfood/SKILL.md — full workflow instructions
- skills/dogfood/references/issue-taxonomy.md — severity/category defs
- skills/dogfood/templates/dogfood-report-template.md — report template

## Tests

21 new tests covering:
- browser_console message/error parsing, clear flag, empty/failed states
- browser_console schema registration
- browser_vision annotate schema and flag passing
- record_sessions config defaults and recording lifecycle
- Dogfood skill file existence and content validation

Addresses #315.

skills/dogfood/references/issue-taxonomy.md

@@ -0,0 +1,109 @@
+# Issue Taxonomy
+
+Use this taxonomy to classify issues found during dogfood QA testing.
+
+## Severity Levels
+
+### Critical
+The issue makes a core feature completely unusable or causes data loss.
+
+**Examples:**
+- Application crashes or shows a blank white page
+- Form submission silently loses user data
+- Authentication is completely broken (can't log in at all)
+- Payment flow fails and charges the user without completing the order
+- Security vulnerability (e.g., XSS, exposed credentials in console)
+
+### High
+The issue significantly impairs functionality but a workaround may exist.
+
+**Examples:**
+- A key button does nothing when clicked (but refreshing fixes it)
+- Search returns no results for valid queries
+- Form validation rejects valid input
+- Page loads but critical content is missing or garbled
+- Navigation link leads to a 404 or wrong page
+- Uncaught JavaScript exceptions in the console on core pages
+
+### Medium
+The issue is noticeable and affects user experience but doesn't block core functionality.
+
+**Examples:**
+- Layout is misaligned or overlapping on certain screen sections
+- Images fail to load (broken image icons)
+- Slow performance (visible loading delays > 3 seconds)
+- Form field lacks proper validation feedback (no error message on bad input)
+- Console warnings that suggest deprecated or misconfigured features
+- Inconsistent styling between similar pages
+
+### Low
+Minor polish issues that don't affect functionality.
+
+**Examples:**
+- Typos or grammatical errors in text content
+- Minor spacing or alignment inconsistencies
+- Placeholder text left in production ("Lorem ipsum")
+- Favicon missing
+- Console info/debug messages that shouldn't be in production
+- Subtle color contrast issues that don't fail WCAG requirements
+
+## Categories
+
+### Functional
+Issues where features don't work as expected.
+
+- Buttons/links that don't respond
+- Forms that don't submit or submit incorrectly
+- Broken user flows (can't complete a multi-step process)
+- Incorrect data displayed
+- Features that work partially
+
+### Visual
+Issues with the visual presentation of the page.
+
+- Layout problems (overlapping elements, broken grids)
+- Broken images or missing media
+- Styling inconsistencies
+- Responsive design failures
+- Z-index issues (elements hidden behind others)
+- Text overflow or truncation
+
+### Accessibility
+Issues that prevent or hinder access for users with disabilities.
+
+- Missing alt text on meaningful images
+- Poor color contrast (fails WCAG AA)
+- Elements not reachable via keyboard navigation
+- Missing form labels or ARIA attributes
+- Focus indicators missing or unclear
+- Screen reader incompatible content
+
+### Console
+Issues detected through JavaScript console output.
+
+- Uncaught exceptions and unhandled promise rejections
+- Failed network requests (4xx, 5xx errors in console)
+- Deprecation warnings
+- CORS errors
+- Mixed content warnings (HTTP resources on HTTPS page)
+- Excessive console.log output left from development
+
+### UX (User Experience)
+Issues where functionality works but the experience is poor.
+
+- Confusing navigation or information architecture
+- Missing loading indicators (user doesn't know something is happening)
+- No feedback after user actions (e.g., button click with no visible result)
+- Inconsistent interaction patterns
+- Missing confirmation dialogs for destructive actions
+- Poor error messages that don't help the user recover
+
+### Content
+Issues with the text, media, or information on the page.
+
+- Typos and grammatical errors
+- Placeholder/dummy content in production
+- Outdated information
+- Missing content (empty sections)
+- Broken or dead links to external resources
+- Incorrect or misleading labels