Restore calendar helper behavior to main, finalize reviewed alias/guard decisions, cover payload and dry-run paths, and record the local migration freeze checkpoint.
Add internal/generator/cmd_param_aliases: reads the reviewed dictionary plus the
live Cobra tree, reduces each concept against a command's real flags (>=2 visible
real flags without a reviewed ambiguous entry fails generation), and emits the
committed internal/cli/param_aliases_generated.go table with lookup helpers.
Extend generate-schema and check-generated-drift.sh to treat the dictionary as a
reviewed input and byte-guard the generated table.
克谨