Introduce a WebUI extension manifest and rewrite the asset bundler/server to support caller-supplied entry sets, extension-injected entries, and negotiated gzip. Key changes: add get_webui_extension_manifest() to helpers/extension, refactor Stop logic into stop_context() and reuse it from the connector `/stop` command, and add a new `/rename` slash command for chat naming. ui_bundler now accepts entry_urls, includes enabled extension entry files, raises the embedded text file size limit to 512 KiB, computes per-entry-set cache keys, and returns a bundle version based on the bundle signature. ui_server applies Starlette GZip middleware, adds routes (/, /index.html, /ui/index, /safe), serves splash/safe documents, injects the serialized webui_extension_manifest into the rendered index, and streamlines the /ui/asset-bundle endpoint with ETag and gzip handling. Also add multiple WebUI assets and fonts, new/updated plugin command YAML and Python command handlers, and corresponding tests covering bundling, commands, chat naming, and WebUI behaviors. Documentation (.dox.md) updated to reflect the new runtime contracts and guidance.
Refactor of messages.js to support lazy rendering.
Move chat rename functionality out of core and into a new _chat_naming plugin, and add a built-in _pin_to_top plugin for sidebar pinning. The chat-naming plugin includes API handlers, prompts, helper logic for selecting user messages and budgeted Utility Model calls, a python monologue_start extension, web UI (modal, store, config, sidebar action), and comprehensive tests. Removed the old core renaming extension and deprecated prompts/tests. Also added pin-to-top plugin files (API, helpers, webui store, tests/docs) and updated various AGENTS.md docs to reflect the new plugins and lifecycle clarifications. Minor UI/js tweak: reorder speak/copy buttons in browser tool handler and add a new webui message-window.js along with related webui/store/component updates and test adjustments.
