feat: instrument AI fill/fix, evals, agents and the debugger (#10853)

* feat: track AI fill, AI fix, evals, reusable agents and debugger usage

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* chore: pin ee ref to the feature_usage registry commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* chore: update ee-repo-ref to c3b6f62ea579a3583d4b474e9885c77104cfc87e

This commit updates the EE repository reference after PR #745 was merged in windmill-ee-private.

Previous ee-repo-ref: 77992910929188a854eadc06ee45971877b6f954

New ee-repo-ref: c3b6f62ea579a3583d4b474e9885c77104cfc87e

Automated by sync-ee-ref workflow.

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>
Co-authored-by: Ruben Fiszel <ruben@windmill.dev>

backend/windmill-api-debug/src/lib.rs

@@ -468,6 +468,9 @@ async fn sign_debug_request(
 
     // Parse the language
     let script_lang: ScriptLang = request.language.parse().unwrap_or(ScriptLang::Bun);
+    // Taken from the parsed language, not the request's string: the telemetry key vocabulary has
+    // to stay the closed set of languages rather than whatever a caller sent.
+    let lang_key = script_lang.as_str();
 
     // Hash the code (we don't include full code in JWT to keep it small)
     let mut hasher = Sha256::new();
@@ -578,6 +581,8 @@ async fn sign_debug_request(
 
     tx.commit().await?;
 
+    windmill_common::feature_usage::log_feature_usage("debugger", "session", lang_key);
+
     Ok(Json(SignedDebugPayload {
         token,
         code: request.code,