feat(v1.1.2-docs): migrations + shared DocsService trait + TriggerEvent::Docs

Migrations 0013_docs.sql + 0014_docs_triggers.sql land the docs table
(JSONB body + GIN-on-jsonb_path_ops index, PK keyed on (app_id,
collection, id) for cross-app isolation) and widen the triggers.kind
and outbox.source_kind CHECK constraints to include 'docs', plus the
docs_trigger_details detail table mirroring kv_trigger_details.

picloud-shared grows the DocsService trait + DocRow/DocsListPage/
DocsError + NoopDocsService, the TriggerEvent::Docs variant with the
prev_data change-data-capture surface, the DocsEventOp enum, the docs
field on the Services bundle, and the SDK_VERSION bump 1.2 -> 1.3.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/shared/src/trigger_event.rs

@@ -45,6 +45,39 @@ impl KvEventOp {
     }
 }
 
+/// Operations a docs trigger can fire on. v1.1.2. Stored as a
+/// lowercase string in `docs_trigger_details.ops` (Postgres `text[]`).
+/// Distinct from `KvEventOp` because docs has CRUD verbs (`create`)
+/// instead of KV's set/upsert flavour (`insert`).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum DocsEventOp {
+    Create,
+    Update,
+    Delete,
+}
+
+impl DocsEventOp {
+    #[must_use]
+    pub const fn as_str(self) -> &'static str {
+        match self {
+            Self::Create => "create",
+            Self::Update => "update",
+            Self::Delete => "delete",
+        }
+    }
+
+    #[must_use]
+    pub fn from_wire(s: &str) -> Option<Self> {
+        match s {
+            "create" => Some(Self::Create),
+            "update" => Some(Self::Update),
+            "delete" => Some(Self::Delete),
+            _ => None,
+        }
+    }
+}
+
 /// Discriminated description of a triggering event. Lifted from the
 /// outbox row's payload at dispatch time. Each variant carries the
 /// fields the corresponding `ctx.event` shape exposes to the script.
@@ -61,6 +94,23 @@ pub enum TriggerEvent {
         value: Option<serde_json::Value>,
     },
 
+    /// A docs create / update / delete fired this handler. v1.1.2.
+    /// `data` is the current document state (absent on delete);
+    /// `prev_data` is the prior state (absent on create). For update
+    /// and delete handlers, `prev_data` is the load-bearing
+    /// change-data-capture surface (the repo reads the old row in the
+    /// same statement as the write).
+    Docs {
+        op: DocsEventOp,
+        collection: String,
+        /// UUID as string — Rhai sees it as a string.
+        id: String,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        data: Option<serde_json::Value>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        prev_data: Option<serde_json::Value>,
+    },
+
     /// A dead-letter row fired this handler. The original event is
     /// nested verbatim plus the dead-letter metadata the design notes
     /// §4 require.
@@ -84,6 +134,7 @@ impl TriggerEvent {
     pub const fn source(&self) -> &'static str {
         match self {
             Self::Kv { .. } => "kv",
+            Self::Docs { .. } => "docs",
             Self::DeadLetter { .. } => "dead_letter",
         }
     }