Expand the shared slash registry and REPL dispatcher with real session-management commands so the CLI feels closer to Claude Code during interactive use. /permissions now reports or switches the active permission mode, /clear rebuilds a fresh local session without restarting the process, and /cost reports cumulative token usage honestly from the runtime tracker.
The implementation keeps command parsing centralized in the commands crate and preserves the existing prompt-mode path while rebuilding runtime state safely when commands change session configuration.
Constraint: Commands must be genuinely useful local behavior rather than placeholders
Constraint: Preserve REPL continuity when changing permissions or clearing session state
Rejected: Store permission-mode changes only in environment variables | would not update the live runtime for the current session
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep future stateful slash commands rebuilding from current session + system prompt instead of mutating hidden runtime internals
Tested: cargo fmt; cargo clippy --workspace --all-targets -- -D warnings; cargo test --workspace
Not-tested: manual live API session exercising permission changes mid-conversation
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