StorageProvider: Enhance parsers to extract moduleOwnership and projectContext

[diberry]

Context

Flight's Phase 2 review confirmed that RoutingConfig.moduleOwnership (always empty Map) and TeamConfig.projectContext (always empty string) are design gaps in the existing parsers (parseRoutingMarkdown, parseTeamMarkdown in markdown-migration.ts), not Phase 2 facade issues. Related to #4.

What to do

Enhance markdown-migration.ts parsers to extract:

• Module ownership section from routing.md → populate moduleOwnership map
• Project context header/tagline from team.md → populate projectContext string

Branch

Work should be done on diberry/sa-phase1-interface

Severity

Nice-to-have (Phase 3 polish)

[diberry]

Parser enhancements shipped alongside #4. routing-io.ts extracts module ownership table, team-io.ts extracts project context section.