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/service/get_secret.rs

@@ -5,31 +5,19 @@ use std::collections::HashMap;
 use uuid::Uuid;
 
 use crate::crypto;
-use crate::service::search::{fetch_entries, fetch_secrets_for_entries};
+use crate::service::search::{fetch_secrets_for_entries, resolve_entry};
 
 /// Decrypt a single named field from an entry.
+/// `folder` is optional; if omitted and multiple entries share the name, an error is returned.
 pub async fn get_secret_field(
     pool: &PgPool,
-    namespace: &str,
-    kind: &str,
     name: &str,
+    folder: Option<&str>,
     field_name: &str,
     master_key: &[u8; 32],
     user_id: Option<Uuid>,
 ) -> Result<Value> {
-    let entries = fetch_entries(
-        pool,
-        Some(namespace),
-        Some(kind),
-        Some(name),
-        &[],
-        None,
-        user_id,
-    )
-    .await?;
-    let entry = entries
-        .first()
-        .ok_or_else(|| anyhow::anyhow!("Not found: [{}/{}] {}", namespace, kind, name))?;
+    let entry = resolve_entry(pool, name, folder, user_id).await?;
 
     let entry_ids = vec![entry.id];
     let secrets_map = fetch_secrets_for_entries(pool, &entry_ids).await?;
@@ -44,27 +32,15 @@ pub async fn get_secret_field(
 }
 
 /// Decrypt all secret fields from an entry. Returns a map field_name → decrypted Value.
+/// `folder` is optional; if omitted and multiple entries share the name, an error is returned.
 pub async fn get_all_secrets(
     pool: &PgPool,
-    namespace: &str,
-    kind: &str,
     name: &str,
+    folder: Option<&str>,
     master_key: &[u8; 32],
     user_id: Option<Uuid>,
 ) -> Result<HashMap<String, Value>> {
-    let entries = fetch_entries(
-        pool,
-        Some(namespace),
-        Some(kind),
-        Some(name),
-        &[],
-        None,
-        user_id,
-    )
-    .await?;
-    let entry = entries
-        .first()
-        .ok_or_else(|| anyhow::anyhow!("Not found: [{}/{}] {}", namespace, kind, name))?;
+    let entry = resolve_entry(pool, name, folder, user_id).await?;
 
     let entry_ids = vec![entry.id];
     let secrets_map = fetch_secrets_for_entries(pool, &entry_ids).await?;