Add webchat-html-tests skill

[OEvgeny]

Fixes #

Changelog Entry

Not required for this PR because it only adds contributor tooling.

Description

Adds a new webchat-html-tests skill for Bot Framework Web Chat contributors working on the HTML Selenium Grid test harness. The skill is a renamed copy of the earlier run-and-debug workflow, but now splits the operational commands into bundled scripts and moves the long-form troubleshooting guidance into reference docs.

Design

The skill body stays small for progressive loading, while the scripts and references carry the heavier operational details. The validation pass used the new scripts to start Docker, wait for Selenium Grid readiness, run a focused HTML test, and clean leaked sessions.

Specific Changes

• Added the webchat-html-tests skill with a more specific name and a keyword-rich description.

• Split Docker, Jest, and Selenium session management into bundled shell and Python scripts.

• Moved test architecture notes and failure recovery guidance into separate reference docs.

• Hardened the Selenium readiness script after a real startup ConnectionResetError during validation.

• I have added tests and executed them locally

• I have updated CHANGELOG.md

• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[Copilot]

Pull request overview

Adds a new contributor-facing webchat-html-tests skill to streamline running and debugging the __tests__/html2 Selenium Grid HTML test harness, with operational steps moved into bundled scripts and longer troubleshooting guidance moved into reference docs.

Changes:

• Added the webchat-html-tests skill entry and procedure doc.
• Introduced helper scripts to start the Docker/Selenium Grid stack, wait for readiness, run HTML tests, and clean leaked sessions.
• Added reference docs describing the HTML test architecture and common failure/snapshot recovery workflows.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.github/skills/webchat-html-tests/SKILL.md	Skill definition and streamlined procedure for running/debugging HTML tests.
.github/skills/webchat-html-tests/scripts/start-grid.sh	Scripted Docker Compose build/up workflow for Selenium Grid + webchat2.
.github/skills/webchat-html-tests/scripts/wait-for-grid.py	Polls Selenium Grid status until ready.
.github/skills/webchat-html-tests/scripts/run-html-tests.sh	Wrapper for running Jest HTML tests (optionally scoped + snapshot update).
.github/skills/webchat-html-tests/scripts/cleanup-grid-sessions.py	Attempts to delete busy Selenium sessions to prevent grid stalls.
.github/skills/webchat-html-tests/references/architecture.md	Reference doc on test layout and regex targeting patterns.
.github/skills/webchat-html-tests/references/failure-modes.md	Reference doc on common failures and snapshot update workflow.

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