Map memory substrate health to SourceOS State Integrity lanes

[mdheller]

Context

SourceOS-Linux/sourceos-syncd now defines the SourceOS State Integrity Report and Index Lane model.

Memory Mesh should adopt the memory, secure, ephemeral, tombstone, audit, and repair lanes so memory health is explicit before agents retrieve, mutate, summarize, or delete memory.

Work

Add reporting for:

• memory object counts by class
• working vs long-term memory staleness
• tombstone counts and propagation status
• contradiction pressure and confidence drift
• provenance coverage
• embedding/index freshness
• secure/redacted memory counts
• replay and repair state

Acceptance criteria

• Memory Mesh can emit a State Integrity Report section or compatible lane report.
• AgentPlane can block memory use when the memory lane is stale, unsafe, or under repair.
• Deletes are represented as tombstone lifecycle events, not direct disappearance.
• Sensitive memory samples are redacted in health reports.
• Lampstand can preserve memory repair and purge decisions as evidence.