Merge ticket 052: allow clearing all params and re-extracting from ingested logs

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

src/profile.rs

@@ -600,6 +600,26 @@ impl Settings {
         Ok(())
     }
 
+    /// Empties `profile_name`'s stored param declarations, persisting settings — the counterpart to
+    /// `record_param_declaration` for `DELETE /api/params` (ticket 052). A profile only ever stores
+    /// manually-declared params (auto-derived ones live only in the engine, never persisted here), so
+    /// this is enough to keep the whole set from reappearing on next load; the engine-side clear
+    /// re-derives whatever auto params the retained log text still supports.
+    pub fn clear_param_declarations(
+        &mut self,
+        settings_path: &Path,
+        profile_name: &str,
+    ) -> Result<(), ProfileError> {
+        let profile = self
+            .profiles
+            .iter_mut()
+            .find(|p| p.name == profile_name)
+            .ok_or(ProfileError::NotFound)?;
+        profile.params.clear();
+        self.save(settings_path)?;
+        Ok(())
+    }
+
     /// Records/updates a declared param into `profile_name`'s stored declarations (matched by param
     /// name), persisting settings. Intended to be called by the HTTP API alongside declaring against
     /// the engine, so declarations survive a restart.