Di lifetime parsing primitives + InternalsVisibleTo

[Skymly]

What to build

Introduce the Di lifetime parsing layer inside Analyzers so Captive Dependency analysis calls shared Lifetime resolution instead of private copies. Registration map is not required yet. Behaviour for existing captive-dependency diagnostics stays frozen unless a blocker bug forces a minimal fix (then note it in CHANGELOG).

Acceptance criteria

• DesignPatterns.Analyzers.Di exposes Lifetime and the shared lifetime-resolution primitives used today by Captive Dependency analysis
• Captive Dependency analysis uses those primitives (no duplicate ResolveLifetime logic left in the analyzer for the covered paths)
• InternalsVisibleTo allows Analyzers.Tests to exercise the Di primitives
• Unit tests cover lifetime resolution edge cases without relying only on full-analyzer Verify
• Existing Captive Dependency Verify snapshots stay green (behaviour freeze)

Blocked by

None — can start immediately.