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

skills/mosaic-board/SKILL.md

@@ -122,7 +122,7 @@ Format the output as a readable Board Decision document:
 
 This skill works **standalone** — you don't need the full Mosaic Stack or Forge pipeline. Just invoke `/skill:mosaic-board` with any brief or proposal.
 
-When used within the **Forge pipeline** (`@mosaic/forge`), the board stage is automated with parallel persona tasks and mechanical synthesis via `board-tasks.ts`.
+When used within the **Forge pipeline** (`@mosaicstack/forge`), the board stage is automated with parallel persona tasks and mechanical synthesis via `board-tasks.ts`.
 
 ---
 

skills/mosaic-forge/SKILL.md

@@ -129,7 +129,7 @@ After each stage, verify before advancing:
 
 ## Full Pipeline Mode (Mosaic Stack)
 
-When the full `@mosaic/forge` package is available, Forge uses MACP task execution:
+When the full `@mosaicstack/forge` package is available, Forge uses MACP task execution:
 
 ```bash
 # Run from CLI