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/src/apply_api.rs

@@ -18,7 +18,7 @@ use serde_json::json;
 use crate::app_repo::AppRepository;
 use crate::apply_service::{
     ApplyError, ApplyOwner, ApplyReport, ApplyService, Bundle, BundleTrigger, CollectionInfo,
-    ExtensionPointInfo, NodeKind, PlanResult, TreeBundle, TreePlanResult,
+    ExtensionPointInfo, NodeKind, PlanResult, TreeBundle, TreePlanResult, TriggerTemplateInfo,
 };
 use crate::authz::{require, AuthzDenied, Capability};
 use crate::group_repo::GroupRepository;
@@ -41,9 +41,30 @@ pub fn apply_router(service: ApplyService) -> Router {
             get(group_extension_points_handler),
         )
         .route("/groups/{id}/collections", get(group_collections_handler))
+        .route("/groups/{id}/triggers", get(group_triggers_handler))
         .with_state(service)
 }
 
+/// Read-only §11 tail trigger-template report for a group: its own declared
+/// event trigger templates (kind, target, handler script, enabled). Viewer-tier
+/// read. Backs `pic triggers ls --group`.
+async fn group_triggers_handler(
+    State(svc): State<ApplyService>,
+    Extension(principal): Extension<Principal>,
+    Path(id_or_slug): Path<String>,
+) -> Result<Json<Vec<TriggerTemplateInfo>>, ApplyError> {
+    let group_id = resolve_group_id(svc.groups.as_ref(), &id_or_slug).await?;
+    require(
+        svc.authz.as_ref(),
+        &principal,
+        Capability::GroupScriptsRead(group_id),
+    )
+    .await
+    .map_err(map_authz)?;
+    let report = svc.trigger_report(ApplyOwner::Group(group_id)).await?;
+    Ok(Json(report))
+}
+
 /// Read-only §11.6 shared-collection report for a group: its own declared
 /// shared KV collection names. Viewer-tier read.
 async fn group_collections_handler(

crates/manager-core/src/apply_service.rs

@@ -461,6 +461,17 @@ pub struct CollectionInfo {
     pub kind: String,
 }
 
+/// One row of the read-only §11 tail trigger-template report (`pic triggers ls
+/// --group`). `target` is the kind-specific identity bit (collection glob or
+/// topic pattern); `script` is the handler script's name.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct TriggerTemplateInfo {
+    pub kind: String,
+    pub target: String,
+    pub script: String,
+    pub enabled: bool,
+}
+
 // ----------------------------------------------------------------------------
 // Errors
 // ----------------------------------------------------------------------------
@@ -569,7 +580,42 @@ impl ApplyService {
     ) -> Result<HashMap<String, ScriptId>, ApplyError> {
         match owner {
             ApplyOwner::App(app_id) => self.resolve_inherited_targets(app_id, bundle).await,
-            ApplyOwner::Group(_) => Ok(HashMap::new()),
+            // §11 tail: a group trigger TEMPLATE binds the group's OWN endpoint
+            // scripts (declared here or pre-existing). Surface the ones a
+            // template references but the bundle doesn't declare, so
+            // `validate_bundle` accepts them (the reconcile's name_to_id already
+            // includes the group's current scripts).
+            ApplyOwner::Group(group_id) => {
+                let declared: HashSet<String> = bundle
+                    .scripts
+                    .iter()
+                    .map(|s| s.name.to_lowercase())
+                    .collect();
+                let referenced: HashSet<String> = bundle
+                    .triggers
+                    .iter()
+                    .map(|t| t.script().to_lowercase())
+                    .collect();
+                let by_name: HashMap<String, ScriptId> = self
+                    .scripts
+                    .list_for_group(group_id)
+                    .await
+                    .map_err(map_repo)?
+                    .into_iter()
+                    .filter(|s| s.kind == ScriptKind::Endpoint)
+                    .map(|s| (s.name.to_lowercase(), s.id))
+                    .collect();
+                let mut out = HashMap::new();
+                for name in referenced {
+                    if declared.contains(&name) {
+                        continue;
+                    }
+                    if let Some(id) = by_name.get(&name) {
+                        out.insert(name, *id);
+                    }
+                }
+                Ok(out)
+            }
         }
     }
 
@@ -1842,6 +1888,58 @@ impl ApplyService {
     /// collections (`name` + `kind`) declared directly at it. Group-only in
     /// practice (the CLI rejects app-declared collections). Backs
     /// `pic collections ls`.
+    /// Read-only §11 tail report: a group's own trigger TEMPLATES, surfaced as
+    /// (kind, target, handler script name, enabled). The stored `name` is a UUID
+    /// default for reconcile-created rows, so the semantic bits are shown
+    /// instead. Backs `pic triggers ls --group`.
+    pub async fn trigger_report(
+        &self,
+        owner: ApplyOwner,
+    ) -> Result<Vec<TriggerTemplateInfo>, ApplyError> {
+        let ApplyOwner::Group(group_id) = owner else {
+            return Ok(Vec::new());
+        };
+        let triggers = self
+            .triggers
+            .list_for_group(group_id)
+            .await
+            .map_err(|e| ApplyError::Backend(e.to_string()))?;
+        let scripts = self
+            .scripts
+            .list_for_group(group_id)
+            .await
+            .map_err(|e| ApplyError::Backend(e.to_string()))?;
+        let name_by_id: HashMap<ScriptId, String> =
+            scripts.iter().map(|s| (s.id, s.name.clone())).collect();
+        Ok(triggers
+            .into_iter()
+            .map(|t| {
+                let (kind, target) = match &t.details {
+                    TriggerDetails::Kv {
+                        collection_glob, ..
+                    } => ("kv", collection_glob.clone()),
+                    TriggerDetails::Docs {
+                        collection_glob, ..
+                    } => ("docs", collection_glob.clone()),
+                    TriggerDetails::Files {
+                        collection_glob, ..
+                    } => ("files", collection_glob.clone()),
+                    TriggerDetails::Pubsub { topic_pattern } => ("pubsub", topic_pattern.clone()),
+                    TriggerDetails::Cron { .. } => ("cron", String::new()),
+                    TriggerDetails::Queue { queue_name, .. } => ("queue", queue_name.clone()),
+                    TriggerDetails::Email { .. } => ("email", String::new()),
+                    TriggerDetails::DeadLetter { .. } => ("dead_letter", String::new()),
+                };
+                TriggerTemplateInfo {
+                    kind: kind.to_string(),
+                    target,
+                    script: name_by_id.get(&t.script_id).cloned().unwrap_or_default(),
+                    enabled: t.enabled,
+                }
+            })
+            .collect())
+    }
+
     pub async fn collection_report(
         &self,
         owner: ApplyOwner,

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;
+}

crates/picloud-cli/src/client.rs

@@ -1346,6 +1346,31 @@ impl Client {
             .await?;
         decode(resp).await
     }
+
+    /// `GET /api/v1/admin/groups/{ident}/triggers` (§11 tail). Group-only —
+    /// trigger templates are declared on groups and fan out to descendant apps.
+    pub async fn group_triggers_list(&self, group_ident: &str) -> Result<Vec<TriggerTemplateDto>> {
+        let ident = seg(group_ident);
+        let resp = self
+            .request(
+                Method::GET,
+                &format!("/api/v1/admin/groups/{ident}/triggers"),
+            )
+            .send()
+            .await?;
+        decode(resp).await
+    }
+}
+
+/// One row of the §11 tail trigger-template report.
+#[derive(Debug, Deserialize)]
+pub struct TriggerTemplateDto {
+    pub kind: String,
+    #[serde(default)]
+    pub target: String,
+    #[serde(default)]
+    pub script: String,
+    pub enabled: bool,
 }
 
 /// One row of the §11.6 shared-collection report.

crates/picloud-cli/src/cmds/triggers.rs

@@ -40,6 +40,21 @@ pub async fn ls(app: &str, mode: OutputMode) -> Result<()> {
     Ok(())
 }
 
+/// `pic triggers ls --group <g>` — read-only view of a group's §11 tail trigger
+/// TEMPLATES (event kinds that fan out live to descendant apps). Authoring is
+/// declarative via the `[group]` manifest `[[triggers.*]]`.
+pub async fn ls_group(group: &str, mode: OutputMode) -> Result<()> {
+    let creds = config::resolve()?;
+    let client = Client::from_creds(&creds)?;
+    let rows = client.group_triggers_list(group).await?;
+    let mut table = Table::new(["kind", "target", "script", "enabled"]);
+    for t in rows {
+        table.row([t.kind, t.target, t.script, t.enabled.to_string()]);
+    }
+    table.print(mode);
+    Ok(())
+}
+
 pub async fn rm(app: &str, trigger_id: &str) -> Result<()> {
     let creds = config::resolve()?;
     let client = Client::from_creds(&creds)?;

crates/picloud-cli/src/main.rs

@@ -891,10 +891,13 @@ enum RoutesCmd {
 
 #[derive(Subcommand)]
 enum TriggersCmd {
-    /// List every trigger in an app.
+    /// List an app's triggers, or a group's trigger TEMPLATES (`--group`).
     Ls {
+        #[arg(long, conflicts_with = "group", required_unless_present = "group")]
+        app: Option<String>,
+        /// List the group's §11 tail trigger templates instead.
         #[arg(long)]
-        app: String,
+        group: Option<String>,
     },
 
     /// Delete a trigger by id.
@@ -1706,8 +1709,12 @@ async fn main() -> ExitCode {
             cmd: AdminsCmd::Rm { id },
         } => cmds::admins::rm(&id).await,
         Cmd::Triggers {
-            cmd: TriggersCmd::Ls { app },
+            cmd: TriggersCmd::Ls { app, group },
-        } => cmds::triggers::ls(&app, mode).await,
+        } => match (app, group) {
+            (_, Some(group)) => cmds::triggers::ls_group(&group, mode).await,
+            (Some(app), None) => cmds::triggers::ls(&app, mode).await,
+            (None, None) => Err(anyhow::anyhow!("provide --app or --group")),
+        },
         Cmd::Triggers {
             cmd: TriggersCmd::Rm { app, trigger_id },
         } => cmds::triggers::rm(&app, &trigger_id).await,

crates/picloud-cli/tests/cli.rs

@@ -28,6 +28,7 @@ mod extension_points;
 mod group_modules;
 mod group_scripts;
 mod group_secrets;
+mod group_triggers;
 mod groups;
 mod init;
 mod invoke;

crates/picloud-cli/tests/group_triggers.rs

@@ -0,0 +1,156 @@
+//! §11 tail — group TRIGGER templates, declarative authoring end to end via
+//! `pic`. A group declares an event trigger template (kv) binding a group-owned
+//! handler; the template persists, `pic triggers ls --group` shows it, re-apply
+//! is a NoOp, and the stateful kinds (cron/queue/email) are rejected on a group.
+//!
+//! The live cross-subtree FIRING (a descendant app's event matches the template,
+//! a sibling's does not) is pinned deterministically by the manager-core
+//! integration test `tests/group_trigger_templates.rs` — driving the async
+//! dispatcher from a journey is deliberately avoided here (codebase norm).
+
+use std::fs;
+
+use tempfile::TempDir;
+
+use crate::common;
+use crate::common::cleanup::{GroupGuard, ScriptGuard};
+
+fn manifest_dir() -> TempDir {
+    let dir = TempDir::new().expect("tempdir");
+    fs::create_dir_all(dir.path().join("scripts")).expect("scripts dir");
+    dir
+}
+
+/// Id of the named script in a group (`pic scripts ls --group <g>`).
+fn group_script_id(env: &common::TestEnv, group: &str, name: &str) -> String {
+    let ls = common::pic_as(env)
+        .args(["scripts", "ls", "--group", group])
+        .output()
+        .expect("scripts ls");
+    let table = String::from_utf8(ls.stdout).unwrap();
+    table
+        .lines()
+        .map(common::cells)
+        .find(|c| c.get(2) == Some(&name))
+        .and_then(|c| c.first().map(|s| (*s).to_string()))
+        .unwrap_or_else(|| panic!("group script `{name}` not found:\n{table}"))
+}
+
+#[ignore = "needs DATABASE_URL pointing at a running Postgres"]
+#[test]
+fn group_kv_trigger_template_applies_and_lists() {
+    let Some(fx) = common::fixture_or_skip() else {
+        return;
+    };
+    let env = common::admin_env(fx);
+    let group = common::unique_slug("gtrig-grp");
+
+    let _g = GroupGuard::new(&env.url, &env.token, &group);
+    common::pic_as(&env)
+        .args(["groups", "create", &group])
+        .assert()
+        .success();
+
+    // A group-owned handler script the template binds.
+    let dir = manifest_dir();
+    fs::write(
+        dir.path().join("scripts/on-write.rhai"),
+        r#"log::info("template fired"); "ok""#,
+    )
+    .unwrap();
+    common::pic_as(&env)
+        .args(["scripts", "deploy"])
+        .arg(dir.path().join("scripts/on-write.rhai"))
+        .args(["--group", &group, "--name", "on-write"])
+        .assert()
+        .success();
+    let _gs = ScriptGuard::new(
+        &env.url,
+        &env.token,
+        &group_script_id(&env, &group, "on-write"),
+    );
+
+    // The group declares a kv trigger TEMPLATE binding the handler.
+    let gmanifest = format!(
+        "[group]\nslug = \"{group}\"\nname = \"GTrig\"\n\n\
+         [[triggers.kv]]\nscript = \"on-write\"\ncollection_glob = \"*\"\nops = [\"insert\"]\n"
+    );
+    let gpath = dir.path().join("group.toml");
+    fs::write(&gpath, &gmanifest).unwrap();
+    common::pic_as(&env)
+        .args(["apply", "--file"])
+        .arg(&gpath)
+        .assert()
+        .success();
+
+    // `triggers ls --group` shows the template (kind + target + handler).
+    let ls = String::from_utf8(
+        common::pic_as(&env)
+            .args(["triggers", "ls", "--group", &group])
+            .output()
+            .unwrap()
+            .stdout,
+    )
+    .unwrap();
+    assert!(
+        ls.contains("kv") && ls.contains("on-write"),
+        "ls should list the kv template binding on-write:\n{ls}"
+    );
+
+    // Re-apply is a NoOp (the template marker already exists — the diff keys on
+    // the semantic identity, so it is not re-created).
+    let report = String::from_utf8(
+        common::pic_as(&env)
+            .args(["apply", "--file"])
+            .arg(&gpath)
+            .output()
+            .unwrap()
+            .stdout,
+    )
+    .unwrap();
+    assert!(
+        !report.contains("trigger")
+            || report.to_lowercase().contains("no changes")
+            || report.contains("0"),
+        "re-apply should not create a second template:\n{report}"
+    );
+}
+
+#[ignore = "needs DATABASE_URL pointing at a running Postgres"]
+#[test]
+fn group_cron_trigger_is_rejected() {
+    let Some(fx) = common::fixture_or_skip() else {
+        return;
+    };
+    let env = common::admin_env(fx);
+    let group = common::unique_slug("gtrig-cron");
+
+    let _g = GroupGuard::new(&env.url, &env.token, &group);
+    common::pic_as(&env)
+        .args(["groups", "create", &group])
+        .assert()
+        .success();
+
+    // A [group] cron trigger is a stateful kind — rejected at the manifest layer.
+    let dir = manifest_dir();
+    let gmanifest = format!(
+        "[group]\nslug = \"{group}\"\nname = \"GTrig\"\n\n\
+         [[triggers.cron]]\nscript = \"x\"\nschedule = \"0 0 * * * *\"\n"
+    );
+    let gpath = dir.path().join("group.toml");
+    fs::write(&gpath, &gmanifest).unwrap();
+    let out = common::pic_as(&env)
+        .args(["apply", "--file"])
+        .arg(&gpath)
+        .output()
+        .expect("apply");
+    assert!(
+        !out.status.success(),
+        "a [group] cron trigger must be rejected (stateful kind)"
+    );
+    let err = String::from_utf8_lossy(&out.stderr);
+    assert!(
+        err.contains("event kind") || err.contains("cron"),
+        "rejection should explain event-kinds-only:\n{err}"
+    );
+}

docs/design/groups-and-project-tool.md

@@ -377,9 +377,25 @@ Two distinct constraints:
 
 > **Ergonomic debt (accepted, watch it):** because triggers don't inherit, 100 tenant apps each
 > needing the same 5 triggers = 500 declarations. The fix is group trigger/route **templates** that
-> fan out per descendant (a *template/instantiation* mechanism, not inheritance) — deferred, but it
+> fan out per descendant — deferred, but it bites early if tenant cardinality is high. Pressure-test
-> bites early if tenant cardinality is high. Pressure-test against real tenant counts before
+> against real tenant counts before committing to the narrow-inheritance choice (§5.1).
-> committing to the narrow-inheritance choice (§5.1).
+>
+> **Shipped — group TRIGGER templates (live, event kinds).** Implemented as **live inheritance via the
+> ancestor-chain CTE**, not the materialized "instantiation" this note first sketched — consistent with
+> how vars/secrets/scripts/§11.6 collections all resolve. A `[group]` declares an EVENT trigger
+> (kv/docs/files/pubsub) binding a group-owned handler; `triggers` gained a polymorphic owner
+> (`0056_group_triggers.sql`, nullable `group_id`, mirrors `0050`), and the dispatcher's
+> `list_matching_kv/docs/files` + the pubsub publish fan-out prepend `CHAIN_LEVELS_CTE` and
+> `JOIN chain c ON (t.app_id = c.app_owner OR t.group_id = c.group_owner)` — so a descendant app's event
+> matches its own triggers **plus** ancestor-group templates in one query, the handler running under the
+> firing app's `app_id` (the Phase-4 boundary). **That walk is the isolation boundary**: a
+> sibling-subtree app never sees the template (pinned by `tests/group_trigger_templates.rs`). Authoring
+> is `[[triggers.kv]]` (etc.) on a `[group]`; read-only `pic triggers ls --group`. **Deferred:** the
+> **stateful** kinds (cron `last_fired_at`, queue advisory-lock, email sealed secret) need per-app rows
+> → materialization, rejected on a `[group]`; **route templates** (same live shape, but the in-memory
+> `RouteTable` would need inherited templates per app + new recompile-invalidation edges); per-app
+> opt-out / cross-owner dedup (a descendant re-declaring an identical trigger double-fires — "overlapping
+> triggers coexist").
 
 ### 4.6 Secrets & `pull`