feat(v1.1.5): pubsub::publish_durable SDK + pubsub:* triggers

Durable pub/sub through the universal outbox — the sixth trigger kind.

- `pubsub::publish_durable(topic, message)` Rhai SDK (no handle; topics
  ARE the grouping unit). Message JSON-encoded; Blobs base64 at any
  depth.
- `PubsubService` trait in picloud-shared with the topic matcher +
  validator (exact / `<prefix>.*` / `*`; mid-pattern wildcards
  rejected). `PostgresPubsubRepo` + `PubsubServiceImpl` in manager-core.
- Publish-time fan-out: one outbox row per matching enabled pubsub
  trigger, all in ONE transaction (no half-fan-out on crash). No
  matching trigger → publish succeeds silently, zero rows.
- `pubsub:*` trigger kind via Layout-E (0020: widen both CHECKs +
  pubsub_trigger_details + partial index), TriggerEvent::Pubsub +
  ctx.event.pubsub, dispatcher arm, admin endpoint POST /triggers/pubsub
  (validates topic pattern + reuses validate_trigger_target).
- AppPubsubPublish capability → script:write (seven-scope held).
- Dashboard Pub/Sub trigger form on the Triggers tab + list rendering.

publish_ephemeral stays deferred to v1.2. ~18 new tests (service
in-memory incl. transactional-rollback, shared matcher, bridge
encoding). No DB required for the suite.

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

crates/manager-core/src/pubsub_repo.rs

@@ -0,0 +1,118 @@
+//! `PubsubRepo` — publish-time fan-out for the v1.1.5 `pubsub::*` SDK.
+//!
+//! `publish_durable` writes one outbox row per matching enabled `pubsub`
+//! trigger, all inside a single transaction so a partial fan-out (some
+//! subscribers got rows, others didn't, then a crash) can't happen.
+//! Each delivery row then retries / dead-letters independently through
+//! the existing dispatcher — no pub/sub-specific dispatch branching.
+//!
+//! Topic pattern matching runs in Rust (`picloud_shared::topic_matches`)
+//! against the small set of the app's enabled pubsub triggers, keeping
+//! the SELECT trivial. v1.2 can add a topic-trie index if fan-out
+//! becomes a hot path.
+
+use async_trait::async_trait;
+use picloud_shared::{topic_matches, AdminUserId, AppId, ExecutionId};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+#[derive(Debug, thiserror::Error)]
+pub enum PubsubRepoError {
+    #[error("database error: {0}")]
+    Db(#[from] sqlx::Error),
+}
+
+/// The execution-context bits a fan-out needs to stamp onto each outbox
+/// row. Derived from the publishing script's `SdkCallCx`.
+#[derive(Debug, Clone, Copy)]
+pub struct PublishCtx {
+    pub app_id: AppId,
+    pub origin_principal: Option<AdminUserId>,
+    pub trigger_depth: u32,
+    pub root_execution_id: ExecutionId,
+}
+
+#[async_trait]
+pub trait PubsubRepo: Send + Sync {
+    /// Fan out a publish to every matching enabled pubsub trigger in
+    /// `ctx.app_id`, inserting one outbox row each in a SINGLE
+    /// transaction. `event_payload` is the serialized
+    /// `TriggerEvent::Pubsub`. Returns the number of delivery rows
+    /// written (0 when no trigger matched — the publish still succeeds).
+    async fn fan_out_publish(
+        &self,
+        ctx: PublishCtx,
+        topic: &str,
+        event_payload: serde_json::Value,
+    ) -> Result<u32, PubsubRepoError>;
+}
+
+pub struct PostgresPubsubRepo {
+    pool: PgPool,
+}
+
+impl PostgresPubsubRepo {
+    #[must_use]
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+#[derive(sqlx::FromRow)]
+struct PubsubTriggerRow {
+    id: Uuid,
+    script_id: Uuid,
+    topic_pattern: String,
+}
+
+#[async_trait]
+impl PubsubRepo for PostgresPubsubRepo {
+    async fn fan_out_publish(
+        &self,
+        ctx: PublishCtx,
+        topic: &str,
+        event_payload: serde_json::Value,
+    ) -> Result<u32, PubsubRepoError> {
+        let mut tx = self.pool.begin().await?;
+
+        // Load all enabled pubsub triggers for the app; filter by topic
+        // pattern in Rust (keeps the query simple, honours the
+        // empty/`*`/prefix semantics without teaching SQL about globs).
+        let rows: Vec<PubsubTriggerRow> = sqlx::query_as(
+            "SELECT t.id, t.script_id, d.topic_pattern \
+             FROM triggers t \
+             JOIN pubsub_trigger_details d ON d.trigger_id = t.id \
+             WHERE t.app_id = $1 AND t.kind = 'pubsub' AND t.enabled = TRUE",
+        )
+        .bind(ctx.app_id.into_inner())
+        .fetch_all(&mut *tx)
+        .await?;
+
+        let mut written: u32 = 0;
+        for r in rows {
+            if !topic_matches(&r.topic_pattern, topic) {
+                continue;
+            }
+            sqlx::query(
+                "INSERT INTO outbox ( \
+                    app_id, source_kind, trigger_id, script_id, reply_to, \
+                    payload, origin_principal, trigger_depth, root_execution_id \
+                 ) VALUES ($1, 'pubsub', $2, $3, NULL, $4, $5, $6, $7)",
+            )
+            .bind(ctx.app_id.into_inner())
+            .bind(r.id)
+            .bind(r.script_id)
+            .bind(&event_payload)
+            .bind(ctx.origin_principal.map(AdminUserId::into_inner))
+            .bind(i32::try_from(ctx.trigger_depth.saturating_add(1)).unwrap_or(1))
+            .bind(ctx.root_execution_id.into_inner())
+            .execute(&mut *tx)
+            .await?;
+            written += 1;
+        }
+
+        // Commit once — all rows or none.
+        tx.commit().await?;
+        Ok(written)
+    }
+}