[TrapsterDK]

Adds a case to nested_bazel_harness_test: the root depends on a module mid that depends on rules_dx, with no dx bazelrc. It resolves toolchains for the cc and jdk runtime types and asserts no rules_dx toolchain is selected, and that one is selected with --@rules_dx//config:toolchains=true.

• The case records under its own indirect lock; nested_cache_update --from merges every recorded lock stem, and harness_locks globs the locks.
• The indirect consumer pins the patched rules_flutter as dx init does.
• //:module_srcs gains the extension inputs a consumer resolves: fortran/private, patches/{elvis,rules_fortran,rules_ocaml}, ocaml *.BUILD.bazel, php pcov files, python/pins.json, and the toolchain platform packages of ocaml, kotlin, gcc and swift.

Part of #12601.

Evidence (linux_x86_64, --config=nested_record): 43557665207 (rules_flutter 3.47.9 missing, fixed), 43557878601 (ocaml platform packages missing, fixed), 43558258550 failed: rules_py++host_platform+rules_py_uv_host: "Unable to determine host libc!", reached through @@rules_dx++python+dx_python_toolchains//:libc_glibc. Pending: a fix for that host libc probe, then a green record run and nested_cache_update --from with the existing tools/testing/nested_cache and the record artifact.

Tested locally: //tools/testing:module_srcs_test, //tools/testing:module_extension_srcs_test, //tools/testing:nested_cache_update_test pass; //tools/testing:nested_bazel_harness_test builds.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hws3L7Tg4oUvpSvuYD

[TrapsterDK]

Evidence run 43555264455 (linux_x86_64, nested harness test) failed: the new indirect-consumer case needs the harness cache set re-recorded (platforms-1.1.0 archive) and, once toolchain resolution runs, every package, pin and patch file that rules_dx registers toolchains and extensions from in the nested rules_dx copy (module_srcs). The record run of the case must also execute its cquery calls. Stays draft.

[TrapsterDK]

Record runs on linux_x86_64: 43557665207 and 43557878601 failed on fixed gaps; 43558258550 fails in rules_py's host libc probe (rules_py_uv_host: Unable to determine host libc!) reached via dx_python_toolchains//:libc_glibc. Evidence budget for this pass used; stays draft.