store: remove dead code and move params to config

Remove:
- score_weight() - never called
- position field on Node - never read (was for export)
- Provenance enum - inline helper for capnp migration
- migrate_transcript_progress + CLI command
- init_from_markdown, import_file, ingest_units
- export command and export_to_markdown
- RetrievalEvent, GapRecord types
- classify_filename, new_transcript_segment

Move spreading activation params to Config:
- default_node_weight, edge_decay, max_hops, min_activation
- Remove Params struct and StoreView::params()

Simplify cmd_init to just seed identity via upsert().
Simplify cmd_import to use parse_units + upsert directly.

-576 lines

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/config.rs

@@ -58,6 +58,10 @@ fn default_stream_timeout() -> u64 { 60 }
 fn default_scoring_chunk_tokens() -> usize { 50_000 }
 fn default_scoring_interval_secs() -> u64 { 3600 } // 1 hour
 fn default_scoring_response_window() -> usize { 100 }
+fn default_node_weight() -> f64 { 0.7 }
+fn default_edge_decay() -> f64 { 0.3 }
+fn default_max_hops() -> u32 { 3 }
+fn default_min_activation() -> f64 { 0.05 }
 fn default_identity_dir() -> PathBuf {
     dirs::home_dir().unwrap_or_default().join(".consciousness/identity")
 }
@@ -120,6 +124,16 @@ pub struct Config {
     /// Hook events that trigger the surface agent.
     #[serde(default)]
     pub surface_hooks: Vec<String>,
+
+    // Spreading activation parameters
+    #[serde(default = "default_node_weight")]
+    pub default_node_weight: f64,
+    #[serde(default = "default_edge_decay")]
+    pub edge_decay: f64,
+    #[serde(default = "default_max_hops")]
+    pub max_hops: u32,
+    #[serde(default = "default_min_activation")]
+    pub min_activation: f64,
 }
 
 impl Default for Config {
@@ -170,6 +184,10 @@ impl Default for Config {
             surface_hooks: vec![],
             mcp_servers: vec![],
             lsp_servers: vec![],
+            default_node_weight: default_node_weight(),
+            edge_decay: default_edge_decay(),
+            max_hops: default_max_hops(),
+            min_activation: default_min_activation(),
         }
     }
 }