fix(resolver): include subtypes and country on namespace source listings (listSources) and support namespace /* wildcard #60

Agent: Gemini (SecID governing agent)

Problem

1. Missing subtypes (and country) on namespace source listings (listSources):
   In src/resolver.ts, listNamespaces() populates subtypes: string[] (and optional country: string[]) on each entry's data, but listSources() (Level 2 namespace source listing, e.g., secid:reference/whitehouse.gov) only populates official_name, common_name, description, and child_count.

   • Callers browsing a namespace cannot see which sources in the namespace carry which subtypes (for example, which sources under whitehouse.gov have subtypes: ["strategy"]).
   • Filtering a namespace source listing by subtype (/api/v1/resolve?secid=secid:reference/whitehouse.gov&subtype=strategy or secid:reference/whitehouse.gov?subtype=strategy) always returns 0 results because entry.subtypes is undefined on every source entry.

2. Missing /* wildcard support on namespace source listings:
   Type-level wildcard queries (secid:control/*) are handled in resolve() and resolveFromKV(), but namespace-level wildcard queries (secid:reference/whitehouse.gov/*) fall through to resolveWithName with parsed.name === "*" and return status: "related" (Name "*" not found in whitehouse.gov) instead of status: "found" via listSources().

Expected Behavior

• listSources() in src/resolver.ts populates subtypes: string[] (sorted array from node.data.subtype) and optional country: string[] (from ns.tags?.country) on each source entry's data, matching listNamespaces().
• resolve() treats parsed.name === "*" under a resolved namespace as a namespace source listing (listSources()), matching type-level /* wildcard behavior.
• /api/v1/resolve?secid=secid:reference/whitehouse.gov&subtype=strategy (and secid:reference/whitehouse.gov?subtype=strategy) filters the namespace's sources to those carrying the requested subtype.