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/doc_corpus.rs

@@ -3,7 +3,7 @@
 //! Reads a directory tree of markdown files, splits on ATX headings,
 //! and emits one Record per section with breadcrumb paths attached.
 
-use anyhow::{anyhow, Result};
+use anyhow::Result;
 use mem_chunk::RecordSource;
 use mem_core::{Provenance, Record, Role};
 use futures::stream::{self, Stream};

crates/mem-ingest/src/obsidian_ref_source.rs

@@ -6,10 +6,9 @@
 //! No vault projection: Obsidian remains source of truth for rebuilds.
 
 use anyhow::Result;
-use mem_chunk::record_source::{Record, RecordSource};
+use mem_chunk::record_source::RecordSource;
+use mem_core::Record;
 use futures::stream::Stream;
-use std::pin::Pin;
-use std::task::{Context, Poll};
 
 /// Reference record metadata
 #[derive(Debug, Clone)]
@@ -39,7 +38,7 @@ impl ObsidianClient {
     }
 
     /// Read file contents from vault
-    pub async fn read_file(&self, path: &str) -> Result<String> {
+    pub async fn read_file(&self, _path: &str) -> Result<String> {
         // TODO: Call Obsidian REST API
         // GET {base_url}/api/vault/readFile?path={path}
         // Returns: file contents

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