feat(log): add registerLogCommand for mosaic log CLI surface

Adds mosaic log tail|search|export|level subcommands to @mosaicstack/log,
wires registerLogCommand into the root mosaic CLI, and ships a smoke test
that asserts command structure without opening the database. Ref CU-05-07.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -404,6 +404,9 @@ importers:
       '@mosaicstack/db':
         specifier: workspace:*
         version: link:../db
+      commander:
+        specifier: ^13.0.0
+        version: 13.1.0
       drizzle-orm:
         specifier: ^0.45.1
         version: 0.45.1(@electric-sql/pglite@0.2.17)(@opentelemetry/api@1.9.0)(@types/better-sqlite3@7.6.13)(@types/pg@8.15.6)(better-sqlite3@12.8.0)(kysely@0.28.11)(postgres@3.4.8)
@@ -469,6 +472,9 @@ importers:
       '@mosaicstack/forge':
         specifier: workspace:*
         version: link:../forge
+      '@mosaicstack/log':
+        specifier: workspace:*
+        version: link:../log
       '@mosaicstack/macp':
         specifier: workspace:*
         version: link:../macp