feat(shipote): collision detection + stats history server-side (fase O)

- Flow socket names usan pipeline_id full (ULID 26 chars) + edge_idx.
  Cero colisiones entre pipelines (ULID es único global). Fallback con
  suffix -N si el path existe (cap 1000 retries).
- WorkspaceState.stats_history (VecDeque cap 64) — workspace_stats
  appendea cada call. API workspace_stats_history(id, tail). Protocol
  WorkspaceStatsHistory. Shell pide history al primer probe → sparkline
  hidratada al boot, sobrevive restart del shell.

84 tests pasan (ente-incarnate 16, nouser-core 27, shipote-card 8,
shipote-core 25, shipote-discern 5, yahweh-provider-fs 3).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/apps/shipote-daemon/src/main.rs

@@ -465,6 +465,31 @@ async fn dispatch(
             },
         },
 
+        Request::WorkspaceStatsHistory { workspace, tail } => {
+            match mgr.workspace_stats_history(workspace, tail).await {
+                Some(samples) => {
+                    let mapped: Vec<WorkspaceStatsInfo> = samples
+                        .into_iter()
+                        .map(|s| WorkspaceStatsInfo {
+                            commands_alive: s.commands_alive,
+                            commands_total: s.commands_total,
+                            rss_bytes: s.rss_bytes,
+                            rss_peak_bytes: s.rss_peak_bytes,
+                            cpu_usec: s.cpu_usec,
+                            cpu_percent: s.cpu_percent,
+                            cpu_cores: s.cpu_cores,
+                            source: s.source,
+                            uptime_ms: s.uptime_ms,
+                        })
+                        .collect();
+                    Response::WorkspaceStatsHistory { samples: mapped }
+                }
+                None => Response::Error {
+                    message: format!("workspace {workspace} not found"),
+                },
+            }
+        }
+
         Request::WorkspaceFullSummary { workspace } => {
             let stats = match mgr.workspace_stats(workspace).await {
                 Some(s) => WorkspaceStatsInfo {