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

packages/coord/src/__tests__/tasks-file.test.ts

@@ -9,9 +9,9 @@ const SAMPLE_TASKS_MD = `# Tasks — MVP
 | id     | status      | milestone | description                                | pr  | notes |
 | ------ | ----------- | --------- | ------------------------------------------ | --- | ----- |
 | P0-001 | done        | Phase 0   | Scaffold monorepo                          | #60 | #1    |
-| P0-002 | done        | Phase 0   | @mosaic/types — migrate and extend         | #65 | #2    |
+| P0-002 | done        | Phase 0   | @mosaicstack/types — migrate and extend         | #65 | #2    |
 | P1-001 | in-progress | Phase 1   | apps/gateway scaffold                      | #61 | #10   |
-| P2-001 | not-started | Phase 2   | @mosaic/agent — Pi SDK integration         | —   | #19   |
+| P2-001 | not-started | Phase 2   | @mosaicstack/agent — Pi SDK integration         | —   | #19   |
 | P2-002 | blocked     | Phase 2   | Multi-provider support                     | —   | #20   |
 `;