Release secrets-mcp 0.3.0: folder/type schema and MCP folder disambiguation

- Rename namespace/kind to folder/type on entries, audit_log, and history tables;
  add notes. Unique key is (user_id, folder, name).
- Service layer and MCP tools support name-first lookup with optional folder when
  multiple entries share the same name.
- secrets_delete dry_run uses the same disambiguation as real deletes.
- Add scripts/migrate-v0.3.0.sql for manual DB migration. Refresh README and
  AGENTS.md.

Made-with: Cursor

crates/secrets-core/src/models.rs

@@ -4,15 +4,18 @@ use serde_json::Value;
 use std::collections::BTreeMap;
 use uuid::Uuid;
 
-/// A top-level entry (server, service, key, …).
+/// A top-level entry (server, service, key, person, …).
 /// Sensitive fields are stored separately in `secrets`.
 #[derive(Debug, Serialize, Deserialize, sqlx::FromRow)]
 pub struct Entry {
     pub id: Uuid,
     pub user_id: Option<Uuid>,
-    pub namespace: String,
-    pub kind: String,
+    pub folder: String,
+    #[serde(rename = "type")]
+    #[sqlx(rename = "type")]
+    pub entry_type: String,
     pub name: String,
+    pub notes: String,
     pub tags: Vec<String>,
     pub metadata: Value,
     pub version: i64,
@@ -40,8 +43,12 @@ pub struct SecretField {
 pub struct EntryRow {
     pub id: Uuid,
     pub version: i64,
+    pub folder: String,
+    #[sqlx(rename = "type")]
+    pub entry_type: String,
     pub tags: Vec<String>,
     pub metadata: Value,
+    pub notes: String,
 }
 
 /// Minimal secret field row fetched before snapshots or cascade deletes.
@@ -128,10 +135,14 @@ pub struct ExportData {
 /// A single entry with decrypted secrets for export/import.
 #[derive(Debug, Serialize, Deserialize)]
 pub struct ExportEntry {
-    pub namespace: String,
-    pub kind: String,
     pub name: String,
     #[serde(default)]
+    pub folder: String,
+    #[serde(default, rename = "type")]
+    pub entry_type: String,
+    #[serde(default)]
+    pub notes: String,
+    #[serde(default)]
     pub tags: Vec<String>,
     #[serde(default)]
     pub metadata: Value,
@@ -181,8 +192,10 @@ pub struct AuditLogEntry {
     pub id: i64,
     pub user_id: Option<Uuid>,
     pub action: String,
-    pub namespace: String,
-    pub kind: String,
+    pub folder: String,
+    #[serde(rename = "type")]
+    #[sqlx(rename = "type")]
+    pub entry_type: String,
     pub name: String,
     pub detail: Value,
     pub created_at: DateTime<Utc>,