Add Feed Intelligence memory profile example

[mdheller]

Summary

Adds an example-only MemoryMesh profile for the canonical SocioProphet Feed Intelligence reader.

Changes

• Adds examples/feed-intelligence/memory-profile.example.md.
• Reuses the existing Slash Topic memory profile posture.
• Keeps raw sensitive payload storage disallowed by default.
• Keeps writeback disabled and dry-run mode set to no-writeback.

Validation

Connector compare shows one new example file and no deletions.

Non-goals

• No schema changes.
• No validator changes.
• No runtime behavior.
• No live recall.
• No durable writeback.