Merge #231: Add CMR to compiler JSON output

5c63de2 Add CMR to compiler output (0ceanslim)

Pull request description:

  The compiler currently outputs only the program binary (base64). Callers deploying programs on-chain also need the   Commitment Merkle Root (CMR) to:                                                                                                                     
    - Derive the taproot address (P2TR scriptPubKey)                                                                   
    - Build the control block for script-path spending                                                                 
                                                                                                                         
  Without CMR in the output, callers must reimplement the entire commitment hash computation externally. Since the     CMR is already computed internally during compilation, this patch exposes it by adding a cmr field (hex string) to 
    both the Output struct and the JSON output (--json flag). The human-readable display also prints it. The change is 
    non-breaking — existing callers that ignore unknown JSON fields are unaffected.


ACKs for top commit:
  apoelstra:
    ACK 5c63de2; successfully ran local tests


Tree-SHA512: f04ae3a9baeafc4b37941dc5979ab2d73456009158a933789c893331a8f7f724d7153381488f378372ae9012046da07fdafa0be85abb7ea6f758746fef8c19a5

Author: apoelstra

src/main.rs

@@ -14,11 +14,14 @@ struct Output {
     witness: Option<String>,
     /// Simplicity program ABI metadata to the program which the user provides.
     abi_meta: Option<AbiMeta>,
+    /// Commitment Merkle Root (CMR) of the program, hex encoded.
+    cmr: String,
 }
 
 impl fmt::Display for Output {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         writeln!(f, "Program:\n{}", self.program)?;
+        writeln!(f, "CMR:\n{}", self.cmr)?;
         if let Some(witness) = &self.witness {
             writeln!(f, "Witness:\n{}", witness)?;
         }
@@ -156,10 +159,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         None
     };
 
+    let cmr_hex = compiled.commit().cmr().to_string();
     let output = Output {
         program: Base64Display::new(&program_bytes, &STANDARD).to_string(),
         witness: witness_bytes.map(|bytes| Base64Display::new(&bytes, &STANDARD).to_string()),
         abi_meta: abi_opt,
+        cmr: cmr_hex,
     };
 
     if output_json {