feat: consolidated and automate changelog management

- Added `rewrite-changelog.ts` and `fix-changelogs.ts` utilities to automate the consolidation of release notes using LLM-assisted processing.
- Updated multiple internal changelog files by consolidating redundant entries and improving phrasing for readability.
- Implemented `previewLine` utility in `coding-agent` to prevent visual spillover in status rows by managing text truncation and whitespace.
- Updated `package.json` with new workflow scripts for managing package-level change histories and documentation indexes.

packages/coding-agent/src/export/html/index.ts

@@ -9,7 +9,7 @@ import { SessionManager } from "../../session/session-manager";
 import templateCss from "./template.css" with { type: "text" };
 import templateHtml from "./template.html" with { type: "text" };
 import templateJs from "./template.js" with { type: "text" };
-// Pre-built React tool renderers: built by `bun --cwd=packages/collab-web run build:tool-views`,
+// Pre-built React tool renderers: built by `gen:tool-views` (`bun run gen:tool-views`),
 // run automatically by root `prepare` on install and by `prepack` at publish.
 import toolViewsJs from "./tool-views.generated.js" with { type: "text" };
 import { webExportThemeVars } from "./web-palette";