Removes a left-over --cxxopt=-D style definition that was inert.

BUILD.bazel

@@ -62,12 +62,6 @@ config_setting(
     define_values = {"ab_stats": "true"},
 )
 
-# Enable DDS_TT_CONTEXT_OWNERSHIP via --define=tt_context_ownership=true
-config_setting(
-    name = "tt_context_ownership",
-    define_values = {"tt_context_ownership": "true"},
-)
-
 # Enable DDS_DEBUG_TT_RESET via --define=tt_reset_debug=true
 config_setting(
     name = "tt_reset_debug",

CPPVARIABLES.bzl

@@ -81,9 +81,6 @@ DDS_LOCAL_DEFINES = select({
 }) + select({
     "//:debug_all": ["DDS_DEBUG_ALL"],
     "//conditions:default": [],
-}) + select({
-    "//:tt_context_ownership": ["DDS_TT_CONTEXT_OWNERSHIP"],
-    "//conditions:default": [],
 }) + select({
     "//:tt_reset_debug": ["DDS_DEBUG_TT_RESET"],
     "//conditions:default": [],

library/tests/system/BUILD.bazel

@@ -33,20 +33,6 @@ cc_test(
     ],
 )
 
-# Same parity test, but with context TT ownership enabled to validate lazy TT path
-cc_test(
-    name = "context_equivalence_test_ctx_tt",
-    size = "small",
-    srcs = ["context_equivalence_test.cpp"],
-    copts = [],
-    local_defines = ["DDS_TT_CONTEXT_OWNERSHIP"],
-    deps = [
-        "//library/src:testable_dds",
-        "//library/src/api:api_definitions",
-        "@googletest//:gtest_main",
-    ],
-)
-
 # New lifecycle test that validates SolverContext-managed TT behavior
 cc_test(
     name = "context_tt_facade_test",

specs/build-system.md

@@ -51,7 +51,6 @@ than re-encoding toolchain knowledge.
   | `debug_all` | `debug_all=true` | `DDS_DEBUG_ALL` | [constants-and-debug](constants-and-debug.md) |
   | `ab_stats` | `ab_stats=true` | `DDS_AB_STATS` | [ab-stats](ab-stats.md) |
   | `scheduler` | `scheduler=true` | `DDS_SCHEDULER` | [system-concurrency](system-concurrency.md) |
-  | `tt_context_ownership` | `tt_context_ownership=true` | `DDS_TT_CONTEXT_OWNERSHIP` | [transposition-table](transposition-table.md) (define wired but inert — no source `#ifdef`s it) |
   | `tt_reset_debug` | `tt_reset_debug=true` | `DDS_DEBUG_TT_RESET` | [transposition-table](transposition-table.md) |
 - **`DDS_LOCAL_DEFINES` is the standard `local_defines` for every core
   `cc_library`; `DDS_SCHEDULER_DEFINE` is appended only where scheduler timing is

specs/transposition-table.md

@@ -68,11 +68,8 @@ its two concrete strategies, trading memory against speed.
   that is not what `SearchContext::trans_table()` does.
 - **Build-flag-gated diagnostics.** `tt_reset_debug` (`DDS_DEBUG_TT_RESET`) enables
   reset-tracking diagnostics in `TransTableL` (wired through [build-system](build-system.md), off
-  by default). `tt_context_ownership` / `DDS_TT_CONTEXT_OWNERSHIP` remains a Bazel
-  `--define` in `CPPVARIABLES.bzl` but is **inert** today — no source `#ifdef`s
-  it. It is applied to one test target (`context_equivalence_test_ctx_tt` in
-  `library/tests/system/BUILD.bazel`), where it likewise has no effect;
-  ownership is always instance-scoped via `SearchContext`.
+  by default). TT ownership itself is not build-flag-gated — it is always
+  instance-scoped via `SearchContext`.
 - **`testable_trans_table`** is the same sources exposed to
   `//library/tests/trans_table/...` for white-box testing; behaviour is identical to
   `trans_table`.