agents: deduplicate timestamps, plan expansion, rename agent

- Add compact_timestamp() to store — replaces 5 copies of
  format_datetime(now_epoch()).replace([':', '-', 'T'], "")
  Also fixes missing seconds (format_datetime only had HH:MM).

- Add ConsolidationPlan::to_agent_runs() — replaces identical
  plan-to-runs-list expansion in consolidate.rs and daemon.rs.

- Port job_rename_agent to use run_one_agent — eliminates manual
  prompt building, LLM call, report storage, and visit recording
  that duplicated the shared pipeline.

- Rename Confidence::weight()/value() to delta_weight()/gate_value()
  to clarify the distinction (delta metrics vs depth gating).

poc-memory/src/store/mod.rs

@@ -28,7 +28,7 @@ mod ops;
 // Re-export everything callers need
 pub use types::{
     memory_dir, nodes_path,
-    now_epoch, epoch_to_local, format_date, format_datetime, format_datetime_space, today,
+    now_epoch, epoch_to_local, format_date, format_datetime, format_datetime_space, compact_timestamp, today,
     Node, Relation, NodeType, Provenance, RelationType,
     RetrievalEvent, Params, GapRecord, Store,
     new_node, new_relation,