refactor(twap_oracle): match instruction function order to Instruction enum

`idl-gen` emits IDL instructions in source order, and `spel` uses each
instruction's IDL position as its serde variant index. When the
`#[instruction]` function order diverges from the `twap_oracle_core::Instruction`
enum order, spel addresses the wrong instruction.

Move `update_current_tick` ahead of the TWAP-computation instruction so the
function order in twap_oracle.rs lines up with the enum variant order, and
regenerate artifacts/twap_oracle-idl.json to match.

No behavioral change — the instruction bodies are unchanged, only reordered.

artifacts/twap_oracle-idl.json

@@ -105,6 +105,35 @@
         }
       ]
     },
+    {
+      "name": "update_current_tick",
+      "accounts": [
+        {
+          "name": "current_tick_account",
+          "writable": true,
+          "signer": false,
+          "init": false
+        },
+        {
+          "name": "price_source",
+          "writable": false,
+          "signer": true,
+          "init": false
+        },
+        {
+          "name": "clock",
+          "writable": false,
+          "signer": false,
+          "init": false
+        }
+      ],
+      "args": [
+        {
+          "name": "price",
+          "type": "u128"
+        }
+      ]
+    },
     {
       "name": "publish_price",
       "accounts": [
@@ -176,35 +205,6 @@
           "type": "u64"
         }
       ]
-    },
-    {
-      "name": "update_current_tick",
-      "accounts": [
-        {
-          "name": "current_tick_account",
-          "writable": true,
-          "signer": false,
-          "init": false
-        },
-        {
-          "name": "price_source",
-          "writable": false,
-          "signer": true,
-          "init": false
-        },
-        {
-          "name": "clock",
-          "writable": false,
-          "signer": false,
-          "init": false
-        }
-      ],
-      "args": [
-        {
-          "name": "price",
-          "type": "u128"
-        }
-      ]
     }
   ],
   "accounts": [

programs/twap_oracle/methods/guest/src/bin/twap_oracle.rs

@@ -111,6 +111,34 @@ mod twap_oracle {
         Ok(spel_framework::SpelOutput::execute(post_states, vec![]))
     }
 
+    /// Updates the tick stored in an existing current tick account.
+    ///
+    /// Expected accounts:
+    /// 1. `current_tick_account` — initialized PDA owned by this oracle program.
+    /// 2. `price_source` — account the caller controls (proven via `is_authorized = true`).
+    /// 3. `clock` — read-only LEZ clock account.
+    ///
+    /// `price` is a `Q64.64` spot price; the oracle converts it to a tick.
+    #[instruction]
+    pub fn update_current_tick(
+        ctx: ProgramContext,
+        #[account(mut)]
+        current_tick_account: AccountWithMetadata,
+        #[account(signer)]
+        price_source: AccountWithMetadata,
+        clock: AccountWithMetadata,
+        price: u128,
+    ) -> SpelResult {
+        let post_states = twap_oracle_program::update_current_tick::update_current_tick(
+            current_tick_account,
+            price_source,
+            clock,
+            price,
+            ctx.self_program_id,
+        );
+        Ok(spel_framework::SpelOutput::execute(post_states, vec![]))
+    }
+
     /// Computes the TWAP from the price observations ring buffer (extrapolated to `now` using the
     /// current tick) and writes it to the price account.
     ///
@@ -169,32 +197,4 @@ mod twap_oracle {
         );
         Ok(spel_framework::SpelOutput::execute(post_states, vec![]))
     }
-
-    /// Updates the tick stored in an existing current tick account.
-    ///
-    /// Expected accounts:
-    /// 1. `current_tick_account` — initialized PDA owned by this oracle program.
-    /// 2. `price_source` — account the caller controls (proven via `is_authorized = true`).
-    /// 3. `clock` — read-only LEZ clock account.
-    ///
-    /// `price` is a `Q64.64` spot price; the oracle converts it to a tick.
-    #[instruction]
-    pub fn update_current_tick(
-        ctx: ProgramContext,
-        #[account(mut)]
-        current_tick_account: AccountWithMetadata,
-        #[account(signer)]
-        price_source: AccountWithMetadata,
-        clock: AccountWithMetadata,
-        price: u128,
-    ) -> SpelResult {
-        let post_states = twap_oracle_program::update_current_tick::update_current_tick(
-            current_tick_account,
-            price_source,
-            clock,
-            price,
-            ctx.self_program_id,
-        );
-        Ok(spel_framework::SpelOutput::execute(post_states, vec![]))
-    }
 }