feat(cli): extend resume commands and add memory inspection

Improve resumed-session parity by letting top-level --resume execute shared read-only commands such as /help, /status, /cost, /config, and /memory in addition to /compact. This makes saved sessions meaningfully inspectable without reopening the interactive REPL.

Also add a genuinely useful /memory command that reports the Claude instruction memory already discovered by the runtime from CLAUDE.md-style files in the current directory ancestry. The command stays honest by surfacing file paths, line counts, and a short preview instead of inventing unsupported persistent memory behavior.

Constraint: Resume-path improvements must operate safely on saved sessions without requiring a live model runtime

Constraint: /memory must expose real repository instruction context rather than placeholder state

Rejected: Invent editable or persistent chat memory storage | no such durable feature exists in this repo yet

Confidence: high

Scope-risk: moderate

Reversibility: clean

Directive: Reuse shared slash parsing for resume-path features so saved-session commands and REPL commands stay aligned

Tested: cargo fmt; cargo clippy --workspace --all-targets -- -D warnings; cargo test --workspace

Not-tested: manual resume against a diverse set of historical session files from real user workflows

rust/crates/commands/src/lib.rs

@@ -83,6 +83,11 @@ const SLASH_COMMAND_SPECS: &[SlashCommandSpec] = &[
         summary: "Inspect discovered Claude config files",
         argument_hint: None,
     },
+    SlashCommandSpec {
+        name: "memory",
+        summary: "Inspect loaded Claude instruction memory files",
+        argument_hint: None,
+    },
 ];
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -96,6 +101,7 @@ pub enum SlashCommand {
     Cost,
     Resume { session_path: Option<String> },
     Config,
+    Memory,
     Unknown(String),
 }
 
@@ -125,6 +131,7 @@ impl SlashCommand {
                 session_path: parts.next().map(ToOwned::to_owned),
             },
             "config" => Self::Config,
+            "memory" => Self::Memory,
             other => Self::Unknown(other.to_string()),
         })
     }
@@ -187,6 +194,7 @@ pub fn handle_slash_command(
         | SlashCommand::Cost
         | SlashCommand::Resume { .. }
         | SlashCommand::Config
+        | SlashCommand::Memory
         | SlashCommand::Unknown(_) => None,
     }
 }
@@ -227,6 +235,7 @@ mod tests {
             })
         );
         assert_eq!(SlashCommand::parse("/config"), Some(SlashCommand::Config));
+        assert_eq!(SlashCommand::parse("/memory"), Some(SlashCommand::Memory));
     }
 
     #[test]
@@ -241,7 +250,8 @@ mod tests {
         assert!(help.contains("/cost"));
         assert!(help.contains("/resume <session-path>"));
         assert!(help.contains("/config"));
-        assert_eq!(slash_command_specs().len(), 9);
+        assert!(help.contains("/memory"));
+        assert_eq!(slash_command_specs().len(), 10);
     }
 
     #[test]