fix: rename all packages from @mosaic/* to @mosaicstack/*

- Updated all package.json name fields and dependency references
- Updated all TypeScript/JavaScript imports
- Updated .woodpecker/publish.yml filters and registry paths
- Updated tools/install.sh scope default
- Updated .npmrc registry paths (worktree + host)
- Enhanced update-checker.ts with checkForAllUpdates() multi-package support
- Updated CLI update command to show table of all packages
- Added KNOWN_PACKAGES, formatAllPackagesTable, getInstallAllCommand
- Marked checkForUpdate() with @deprecated JSDoc

Closes #391

docs/scratchpads/p8-009-tui-slash-commands.md

@@ -12,7 +12,7 @@
 
 ## Key Observations
 
-- CommandDef in @mosaic/types does NOT have `category` field — will omit from LOCAL_COMMANDS
+- CommandDef in @mosaicstack/types does NOT have `category` field — will omit from LOCAL_COMMANDS
 - CommandDef.args is `CommandArgDef[] | undefined`, not `{ usage: string }` — help.ts args rendering needs adjustment
 - Message role union currently: 'user' | 'assistant' | 'thinking' | 'tool' — adding 'system'
 - InputBar currently takes `onSubmit: (value: string) => void` — need to add slash command interception