diff --git a/src/lsh/definitions.rs b/src/lsh/definitions.rs
index a1b2c3d..d4c3b2a 100644
--- a/src/lsh/definitions.rs
+++ b/src/lsh/definitions.rs
@@ -12,9 +12,11 @@ // context line 12
 // context line 13
-// old placeholder logic A
-const LEGACY_FLAG: bool = true;
-// end legacy block
+// updated placeholder logic A
+const LEGACY_FLAG: bool = false; // flipped for test
+// added note: migration in progress
+// end legacy block
 // context line 19
 // context line 20
@@ -42,7 +44,12 @@ // context line 42
 // context line 43
-    do_placeholder_action(alpha, beta);
+    // Split actions for clarity
+    do_placeholder_prepare(alpha);
+    do_placeholder_action(alpha, beta);
+    if (enable_extra()) {
+        do_placeholder_followup(beta);
+    }
 // context line 50
 // context line 51
 // context line 52
@@ -90,6 +97,15 @@ // context line 90
 // context line 91
 // context line 92
+/// Added lightweight fake helper
+fn enable_extra() -> bool {
+    // Pretend this consults a config value
+    true
+}
+
+// Temporary debug instrumentation (to be removed)
+const _DEBUG_HOOK: &str = "lsh:extra";
+
 // context line 93
 // context line 94
 // context line 95

diff --git a/src/tui.rs b/src/tui.rs
index 1122334..5566778 100644
--- a/src/tui.rs
+++ b/src/tui.rs
@@ -5,8 +5,13 @@ // context line 5
 // context line 6
 // context line 7
-// previous rendering stub
-render_placeholder(frame);
+// refined rendering sequence
+begin_frame(frame);
+render_header(frame);
+render_body(frame);
+render_footer(frame);
+end_frame(frame);
+
 // context line 14
 // context line 15
 // context line 16

diff --git a/README.md b/README.md
index 9aa9aa9..1bb1bb1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,11 @@
 # Project Title
-Some brief description here.
+Some brief description here (updated).
+
+Experimental notes:
+- Added fake diff example
+- Demonstrates multi-hunk & multi-file patch
+
 ## Usage
 Run the binary as needed.

diff --git a/Cargo.toml b/Cargo.toml
index cafe123..fade321 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,10 @@ edition = "2021"
 # context
 [features]
-default = []
+default = ["experimental-preview"]
+experimental-preview = []
+
+# NOTE: Above feature is placeholder & fake

 [dependencies]
 # context
@@ -20,6 +23,7 @@ anyhow = "1"
 # context
 # instrumentation (fake addition)
 tracing = "0.1"
+tracing-subscriber = "0.3"

diff --git a/src/feature/experimental.rs b/src/feature/experimental.rs
new file mode 100644
index 0000000..abc1234
--- /dev/null
+++ b/src/feature/experimental.rs
@@ -0,0 +1,24 @@
+//! Placeholder experimental module (fake content).
+//! This file exists only to demonstrate a multi-file diff.
+#![allow(dead_code)]
+
+pub struct ExperimentalToggle {
+    enabled: bool,
+}
+
+impl ExperimentalToggle {
+    pub fn new() -> Self {
+        Self { enabled: true }
+    }
+    pub fn enabled(&self) -> bool {
+        self.enabled
+    }
+}
+
+pub fn run_experimental_path() {
+    if ExperimentalToggle::new().enabled() {
+        // Fake behavior
+        eprintln!("(fake) running experimental path");
+    }
+}
+

diff --git a/assets/old_logo.svg b/assets/old_logo.svg
deleted file mode 100644
index 55aa55a..0000000
--- a/assets/old_logo.svg
+++ /dev/null
@@ -1,5 +0,0 @@
-<!-- Fake removed asset -->
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 10">
-  <rect width="10" height="10" fill="#FF00FF"/>
-  <text x="1" y="9" font-size="3">X</text>
-</svg>