fix: resolve compilation errors in mem-ingest and mem-cli

- Fix Record import: mem_core::Record instead of mem_chunk
- Remove unused imports (anyhow::anyhow, Pin, Context, Poll, Result)
- Stub check_database() in verify.rs (pending PgRepo implementation)
- Wrap run_id with Some() to match Option<String> type
- All tests pass, no blocking compilation errors

crates/mem-ingest/src/reference_cycle_guard.rs

@@ -4,7 +4,7 @@
 //! in session transcripts and marks them as derived (not evidence).
 //! Uses shingle matching at section granularity with configurable thresholds.
 
-use anyhow::Result;
+
 use std::collections::HashMap;
 
 /// Artifact (skill or reference) in the manifest
@@ -67,7 +67,7 @@ impl ReferenceCycleGuard {
     /// Check if a chunk matches any reference in manifest
     pub fn detect_derived_reference(
         &self,
-        content: &str,
+        _content: &str,
         content_shingles: &[String],
     ) -> Option<ShingleMatch> {
         // Compute shingle overlap with all reference artifacts