chore: rebrand companion-os to clanker-agent

- Rename all package names from companion-* to clanker-*
- Update npm scopes from @mariozechner to @harivansh-afk
- Rename config directories .companion -> .clanker
- Rename environment variables COMPANION_* -> CLANKER_*
- Update all documentation, README files, and install scripts
- Rename package directories (companion-channels, companion-grind, companion-teams)
- Update GitHub URLs to harivansh-afk/clanker-agent
- Preserve full git history from companion-cloud monorepo

packages/coding-agent/test/browser-tool.test.ts

@@ -155,7 +155,7 @@ describe("browser tool", () => {
       profileDir,
       stateDir,
       headed: true,
-      windowClass: "CompanionBrowser",
+      windowClass: "ClankerBrowser",
     });
 
     await browserTool.execute("browser-open-window-class", {
@@ -168,7 +168,7 @@ describe("browser tool", () => {
       profileDir,
       "--headed",
       "--args",
-      "--class=CompanionBrowser",
+      "--class=ClankerBrowser",
       "open",
       "https://example.com",
     ]);