feat(executor): expose ctx.request.method to scripts (F4)

The request map exposed path/headers/body/params/query/rest but not the
HTTP method, forcing one script per verb (the E2E app needed 7 scripts
where ~3 would do). Add a `method` field to ExecRequest (populated from
the HTTP method on the sync-execute bypass and the HTTP outbox payload;
empty for non-HTTP triggers) and surface it as `ctx.request.method`,
uppercased. A single script can now branch GET/POST on one route.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/orchestrator-core/src/api.rs

@@ -584,6 +584,8 @@ fn build_exec_request(
         script_name: name.to_string(),
         invocation_type: InvocationType::Http,
         path: format!("/api/execute/{id}"),
+        // The `/api/v1/execute/{id}` bypass is POST-only.
+        method: "POST".into(),
         headers: hmap,
         body: body_json,
         params: BTreeMap::new(),