refactor(planner): rename asap-physical-operators to the Stage 4 asap-executor crate

Rename crates/asap-physical-operators to crates/executor (package
asap-executor), keeping plan/ and physical_planner/ in it as #572's
2026-10-03 update decides. Imports are rewritten without compatibility
re-exports. The three stage manifest guards now reject asap-executor;
only integration-tests depends on it (#572, B5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: zzylol

Cargo.lock

@@ -1,6 +1,6 @@
 [workspace]
 members = [
-    "crates/asap-physical-operators",
+    "crates/executor",
     "crates/types",
     "crates/frontend-common",
     "crates/sql-function-catalog",

Cargo.toml

@@ -1,8 +1,12 @@
 [package]
-name = "asap-physical-operators"
+name = "asap-executor"
 version = "0.1.0"
 edition = "2021"
 
+# #509 Stage 4 reference executor. No stage crate (asap-logical-optimizer,
+# asap-physical-optimizer, asap-plan-selection) depends on it; their manifest
+# guards reject it. Its tests use the stage crates as dev-dependencies.
+
 [dependencies]
 chrono = { version = "0.4.39", default-features = false, features = ["std"] }
 futures = "0.3"