feat(cli): pic triggers ls --group + group-template journeys + docs (§11 tail T4)

- apply_service: trigger_report(group) → TriggerTemplateInfo
  (kind/target/script/enabled); resolve_inherited_targets_for(Group) now
  surfaces the group's OWN endpoint scripts so a template's handler
  validates (fixes "binds to unknown script" when the handler is a
  pre-existing group script, not declared in the same manifest).
- apply_api: GET /groups/{id}/triggers (GroupScriptsRead).
- CLI: `pic triggers ls --group <g>` (--app/--group mutually exclusive)
  + the client method + DTO.
- tests/group_trigger_templates.rs (manager-core, live DB): the chain
  union matches a descendant app's kv insert against the group template
  and NOT a sibling subtree — the isolation boundary, deterministic.
- tests/group_triggers.rs (journey): apply a kv template, ls --group
  shows it, re-apply NoOp, cron-on-group rejected.
- docs: design §4.5 (live-event-kinds decision + deferrals), CLAUDE.md.

Full journey suite 119/119; workspace tests 0 failures; clippy -D clean;
schema unchanged (blessed in T1).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/manager-core/tests/group_trigger_templates.rs

@@ -0,0 +1,170 @@
+//! §11 tail integration test: the live chain-union dispatch for group trigger
+//! templates. A group-owned kv trigger TEMPLATE must be matched for a
+//! **descendant** app (the union via `CHAIN_LEVELS_CTE`) and must NOT be matched
+//! for an app in a **sibling** subtree — that walk is the isolation boundary.
+//!
+//! Deterministic (no async dispatcher) so it pins the security-critical SQL
+//! without flakiness. Skips cleanly when `DATABASE_URL` is unset.
+
+#![allow(
+    clippy::needless_pass_by_value,
+    clippy::many_single_char_names,
+    clippy::too_many_lines
+)]
+
+use picloud_manager_core::trigger_repo::{PostgresTriggerRepo, TriggerRepo};
+use picloud_shared::{AppId, KvEventOp};
+use sqlx::postgres::PgPoolOptions;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+async fn pool_or_skip() -> Option<PgPool> {
+    let Ok(url) = std::env::var("DATABASE_URL") else {
+        eprintln!("group_trigger_templates: DATABASE_URL unset — skipping");
+        return None;
+    };
+    let pool = PgPoolOptions::new()
+        .max_connections(2)
+        .connect(&url)
+        .await
+        .expect("connect to DATABASE_URL");
+    sqlx::migrate!("./migrations")
+        .run(&pool)
+        .await
+        .expect("apply migrations");
+    Some(pool)
+}
+
+async fn id1(pool: &PgPool, sql: &str, bind: &str) -> Uuid {
+    let row: (Uuid,) = sqlx::query_as(sql)
+        .bind(bind)
+        .fetch_one(pool)
+        .await
+        .expect("insert returning id");
+    row.0
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn group_kv_template_matches_descendant_not_sibling() {
+    let Some(pool) = pool_or_skip().await else {
+        return;
+    };
+    let sfx = Uuid::new_v4().simple().to_string();
+
+    // registered_by principal
+    let admin = id1(
+        &pool,
+        "INSERT INTO admin_users (username, password_hash) VALUES ($1, 'x') RETURNING id",
+        &format!("gtt-{sfx}"),
+    )
+    .await;
+
+    // G owns the template; G2 is an unrelated sibling subtree.
+    let g = id1(
+        &pool,
+        "INSERT INTO groups (slug, name) VALUES ($1, $1) RETURNING id",
+        &format!("gtt-g-{sfx}"),
+    )
+    .await;
+    let g2 = id1(
+        &pool,
+        "INSERT INTO groups (slug, name) VALUES ($1, $1) RETURNING id",
+        &format!("gtt-g2-{sfx}"),
+    )
+    .await;
+
+    // App A under G (descendant); app C under G2 (sibling subtree).
+    let a: (Uuid,) =
+        sqlx::query_as("INSERT INTO apps (slug, name, group_id) VALUES ($1, $1, $2) RETURNING id")
+            .bind(format!("gtt-a-{sfx}"))
+            .bind(g)
+            .fetch_one(&pool)
+            .await
+            .expect("app A");
+    let c: (Uuid,) =
+        sqlx::query_as("INSERT INTO apps (slug, name, group_id) VALUES ($1, $1, $2) RETURNING id")
+            .bind(format!("gtt-c-{sfx}"))
+            .bind(g2)
+            .fetch_one(&pool)
+            .await
+            .expect("app C");
+
+    // Group-owned handler script under G.
+    let s: (Uuid,) = sqlx::query_as(
+        "INSERT INTO scripts (name, source, group_id) VALUES ($1, 'x', $2) RETURNING id",
+    )
+    .bind(format!("handler-{sfx}"))
+    .bind(g)
+    .fetch_one(&pool)
+    .await
+    .expect("group script");
+
+    // Group kv trigger TEMPLATE (group_id = G, app_id NULL) + details.
+    let t: (Uuid,) = sqlx::query_as(
+        "INSERT INTO triggers \
+            (group_id, script_id, kind, enabled, dispatch_mode, \
+             retry_max_attempts, retry_backoff, retry_base_ms, \
+             registered_by_principal, name) \
+         VALUES ($1, $2, 'kv', TRUE, 'async', 3, 'exponential', 1000, $3, $4) \
+         RETURNING id",
+    )
+    .bind(g)
+    .bind(s.0)
+    .bind(admin)
+    .bind(format!("tmpl-{sfx}"))
+    .fetch_one(&pool)
+    .await
+    .expect("template trigger");
+    sqlx::query(
+        "INSERT INTO kv_trigger_details (trigger_id, collection_glob, ops) \
+         VALUES ($1, '*', ARRAY['insert'])",
+    )
+    .bind(t.0)
+    .execute(&pool)
+    .await
+    .expect("kv details");
+
+    let repo = PostgresTriggerRepo::new(pool.clone());
+
+    // Descendant app A's kv insert matches the ancestor group's template.
+    let matched = repo
+        .list_matching_kv(AppId::from(a.0), "users", KvEventOp::Insert)
+        .await
+        .expect("match for A");
+    assert!(
+        matched.iter().any(|m| m.trigger_id == t.0.into()),
+        "a descendant app must match the group's kv template"
+    );
+
+    // Sibling-subtree app C must NOT — the chain union is the isolation boundary.
+    let none = repo
+        .list_matching_kv(AppId::from(c.0), "users", KvEventOp::Insert)
+        .await
+        .expect("match for C");
+    assert!(
+        !none.iter().any(|m| m.trigger_id == t.0.into()),
+        "a sibling-subtree app must NOT match another subtree's group template"
+    );
+
+    // Cleanup (best-effort; ordering respects the FKs).
+    let _ = sqlx::query("DELETE FROM triggers WHERE id = $1")
+        .bind(t.0)
+        .execute(&pool)
+        .await;
+    let _ = sqlx::query("DELETE FROM scripts WHERE id = $1")
+        .bind(s.0)
+        .execute(&pool)
+        .await;
+    let _ = sqlx::query("DELETE FROM apps WHERE id = ANY($1)")
+        .bind(vec![a.0, c.0])
+        .execute(&pool)
+        .await;
+    let _ = sqlx::query("DELETE FROM groups WHERE id = ANY($1)")
+        .bind(vec![g, g2])
+        .execute(&pool)
+        .await;
+    let _ = sqlx::query("DELETE FROM admin_users WHERE id = $1")
+        .bind(admin)
+        .execute(&pool)
+        .await;
+}