feat: release ai chat.

[knightedcodemonkey]

• closes Feature: Add an AI Agent Side Panel using GitHub Models for @knighted/develop #18

[Copilot]

Pull request overview

This PR removes the opt-in feature flag for AI chat and makes the GitHub AI chat drawer available by default once a GitHub token is connected, aligning docs and Playwright coverage with the new default behavior.

Changes:

• Remove featureEnabled gating from the GitHub chat drawer and token-visibility logic so chat is token-driven.
• Delete the feature-flags module and remove ?feature-ai=true documentation references.
• Update Playwright specs to load the app without the feature-ai query parameter and adjust expected chat visibility.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/modules/github-chat-drawer/drawer.js	Removes feature-flag early return so the drawer logic is always initialized.
src/modules/feature-flags.js	Removes the AI assistant feature-flag implementation entirely.
src/app.js	Removes feature-flag wiring; shows chat toggle when a token is present.
README.md	Removes outdated note about opting into AI chat via ?feature-ai=true.
docs/byot.md	Updates BYOT docs to reflect AI chat availability after token connection (no flag).
playwright/github-pr-drawer.spec.ts	Drops ?feature-ai=true from app loads across PR drawer tests.
playwright/github-byot-ai.spec.ts	Updates test expectations and drops feature-flag-specific test coverage.

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