fix: align bmad-help.csv with documented schema and clean up source rows (#2278) (#2349)

* fix(installer): preserve module-help.csv schema in merged bmad-help.csv (#2278)

The installer's mergeModuleHelpCatalogs was rewriting the merged catalog
under a different schema (module,phase,name,code,sequence,workflow-file,...)
than the documented source schema in every module's module-help.csv
(module,skill,display-name,menu-code,description,action,args,phase,...).

Worse, the parsing assumed the wrong source column order, so column data
was scrambled in the merged output. SKILL.md docs the source schema, so
the bmad-help skill was navigating a catalog whose actual columns no
longer matched its mental model.

Drop the transformation and the agent enrichment columns (which had no
consumers anywhere in the codebase). Emit rows verbatim in the source
schema, padding short rows and filling empty module fields. Sort by
module then phase, stable within phase to preserve authored order.

Closes #2278

* fix(catalog): normalize module-help.csv rows to documented 13-column schema

Many rows in core-skills/module-help.csv and bmm-skills/module-help.csv
were missing one column between description and phase, leaving them at
12 fields instead of 13. CSV consumers that read by header position
were silently mapping data into the wrong columns (description into
action, phase into args, required into before, etc).

Inserted an empty cell at column index 5 across all 31 affected rows
to restore alignment with the documented header
(module,skill,display-name,menu-code,description,action,args,phase,
after,before,required,output-location,outputs).