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/modules/shipote/shipote-protocol/src/lib.rs

@@ -110,6 +110,14 @@ pub enum Request {
     /// Reporte de quotas (rlimits declarados vs uso actual).
     WorkspaceQuota { workspace: shipote_card::WorkspaceId },
 
+    /// History de samples del workspace (server-side). Sobrevive
+    /// restart del shell. `tail`: cantidad de samples desde el final
+    /// (0 = todo).
+    WorkspaceStatsHistory {
+        workspace: shipote_card::WorkspaceId,
+        tail: usize,
+    },
+
     /// Resumen completo de un workspace: stats + quota + commands +
     /// flow sockets en una sola roundtrip. Reduce N×4 requests del
     /// shell a N×1.
@@ -210,6 +218,10 @@ pub enum Response {
         info: QuotaReportInfo,
     },
 
+    WorkspaceStatsHistory {
+        samples: Vec<WorkspaceStatsInfo>,
+    },
+
     WorkspaceFullSummary {
         stats: WorkspaceStatsInfo,
         quota: QuotaReportInfo,