Slash commands: cockpit and truth-surface wiring

[Hmbown]

Scope

Wire command outcomes into the truth surface so slash commands do not feel like invisible side effects. The cockpit/sidebar should show the active command, last event, failure reason, recovery hint, and detail handle when output is summarized.

Command families in scope:

• State and telemetry: /status, /statusline, /tokens, /cost, /cache, /system, /context
• Safety and recovery visibility: /compact, /undo, /retry, /diff, /change, /edit
• UX/reporting surfaces: /home, /links, /feedback where they affect current session state

PEEK framing

Use Distiller / Cartographer / Evictor as the cockpit discipline: distill noisy command output into decision-quality rows, place each row in Now/Recent/Pending/Budget/Levers, and evict stale rows before losing the detail handle.

Acceptance

• /compact is visible as a real Budget/Levers affordance, especially around the 60 percent context-pressure hint.
• Command failures expose the actionable error and a detail handle instead of stale CLI snippets.
• Recent command/tool rows are bounded but auditable.
• Tests cover at least one successful command receipt, one failed command receipt, and one summarized output with detail access.

Related: #1884, #1551, #1735, #1607, #1682.

[Hmbown]

Implementation notes for the next agent:

Primary files to inspect:

• crates/tui/src/commands/mod.rs and command modules for result shape.
• crates/tui/src/tui/sidebar.rs for cockpit panels.
• crates/tui/src/tui/app.rs for app state that can hold recent command receipts.
• crates/tui/src/tui/ui.rs around slash-command execution and AppAction::CompactContext.
• crates/tui/src/tui/footer_ui.rs for statusline overlap.

Suggested data shape:

enum ReceiptStatus { Started, Succeeded, Failed, Cancelled }
enum CockpitPanel { Now, Recent, Pending, Budget, Levers }

struct CommandReceipt {
    id: String,
    command: String,
    args_preview: String,
    status: ReceiptStatus,
    started_at: Instant,
    finished_at: Option<Instant>,
    summary: String,
    detail_handle: Option<String>,
    recovery_hint: Option<String>,
    panel: CockpitPanel,
}

fn distill_command_result(command: &str, result: &CommandResult) -> CommandReceipt {
    let panel = cartograph_command(command, result);
    let summary = summarize_without_losing_handle(result.message.as_deref());
    CommandReceipt { command, status: status_from(result), summary, detail_handle: result_handle(result), panel, .. }
}

fn cartograph_command(command: &str, result: &CommandResult) -> CockpitPanel {
    match command {
        "compact" | "tokens" | "cost" | "cache" => CockpitPanel::Budget,
        "status" | "system" | "context" | "diff" => CockpitPanel::Recent,
        "undo" | "retry" | "edit" | "change" => CockpitPanel::Levers,
        _ if result.is_error => CockpitPanel::Now,
        _ => CockpitPanel::Recent,
    }
}

Acceptance details:

• /compact already exists; this issue should make it discoverable, not rebuild it.
• Around 60 percent context pressure, Budget should show a compact hint like Use /compact or auto-compact on.
• Failed command rows should show actionable reason plus detail handle, not a stale raw CLI fragment.
• The Evictor rule is simple for v0.8.43: keep the active row, last failure, and recent successful rows; drop idle duplicates first.