diff --git a/.claude/rules/architecture-map.md b/.claude/rules/architecture-map.md
index 3d439cdc..e6a99867 100644
--- a/.claude/rules/architecture-map.md
+++ b/.claude/rules/architecture-map.md
@@ -70,8 +70,10 @@ shell (or, in parallel, in per-test `.result` files aggregated at the end).
 | `state/context.sh` | per-test output buffer, exit code, title, hook failure, and the per-test reset |
 | `state/payload.sh` | the encoded per-test result payload and the base64 capability probe |
 | `state/parallel.sh` | aggregating per-test result files after a `--parallel` run |
-| `env.sh` | all `BASHUNIT_*` defaults/config files, scratch dirs (`_BASHUNIT_RUN_OUTPUT_DIR` + EXIT-trap cleanup) |
-| `parallel.sh` | worker temp tree, aggregation, stop-on-failure flag file |
+| `config/index.sh` | aggregator only — sources the `src/config/` module below |
+| `config/env.sh` | all `BASHUNIT_*` defaults/config files, scratch dirs (`_BASHUNIT_RUN_OUTPUT_DIR` + EXIT-trap cleanup); executes at source time |
+| `config/rerun.sh` | the `.bashunit/last-failed` cache for `--rerun-failed` |
+| `config/parallel.sh` | is this run parallel; worker temp tree and stop-on-failure flag file (not `runner/parallel.sh`, which waits on job slots) |
 | `console/index.sh` | aggregator only — sources the `src/console/` module below |
 | `console/colors.sh` | the `_BASHUNIT_COLOR_*` palette and `bashunit::sgr` |
 | `console/header.sh` | the "Running N tests" header |
@@ -104,7 +106,7 @@ shell (or, in parallel, in per-test `.result` files aggregated at the end).
 | `coverage/branches.sh` | branch extraction + hit computation; **one file on purpose** — the `_branch_*` helpers mutate `extract_branches`'s locals via dynamic scoping |
 | `coverage/report_text.sh` / `report_lcov.sh` / `report_html.sh` | the three renderers |
 | `coverage/html_index.sh` / `html_file.sh` | HTML page emitters; the only two files exempt from `max_line_length` |
-| `rerun.sh` | `.bashunit/last-failed` cache for `--rerun-failed` |
+
 | `reports.sh` | JUnit/HTML/TAP/JSON writers |
 | `system/index.sh` | aggregator only — sources the `src/system/` module below |
 | `system/check_os.sh` / `system/dependencies.sh` | one-fork OS detect; `command -v` probes (builtins, not forks) |
diff --git a/bashunit b/bashunit
index ebc36ab2..754ea106 100755
--- a/bashunit
+++ b/bashunit
@@ -68,8 +68,7 @@ source "$BASHUNIT_ROOT_DIR/src/dev/debug.sh"
 source "$BASHUNIT_ROOT_DIR/src/system/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/util/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/api/index.sh"
-source "$BASHUNIT_ROOT_DIR/src/parallel.sh"
-source "$BASHUNIT_ROOT_DIR/src/env.sh"
+source "$BASHUNIT_ROOT_DIR/src/config/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/coverage/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/state/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/console/index.sh"
@@ -77,7 +76,6 @@ source "$BASHUNIT_ROOT_DIR/src/helper/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/cli/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/assert/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/reports/index.sh"
-source "$BASHUNIT_ROOT_DIR/src/rerun.sh"
 source "$BASHUNIT_ROOT_DIR/src/runner/index.sh"
 source "$BASHUNIT_ROOT_DIR/src/benchmark.sh"
 source "$BASHUNIT_ROOT_DIR/src/learn/index.sh"
diff --git a/build.sh b/build.sh
index aaa56792..0949a678 100755
--- a/build.sh
+++ b/build.sh
@@ -72,7 +72,7 @@ function build::process_file() {
 
   # Key the dedupe and the marker on a repo-relative path, never a basename: the
   # top-level loop passes `src/x.sh` while the recursion passes an absolute path,
-  # and two modules can hold the same basename (src/parallel.sh vs
+  # and two modules can hold the same basename (src/config/parallel.sh vs
   # src/runner/parallel.sh). `$file` itself stays untouched so the `tail` and
   # `dirname` below work on whichever form the caller passed.
   local marker="${file#"$BASHUNIT_ROOT_DIR"/}"
diff --git a/src/env.sh b/src/config/env.sh
similarity index 100%
rename from src/env.sh
rename to src/config/env.sh
diff --git a/src/config/index.sh b/src/config/index.sh
new file mode 100644
index 00000000..c667191e
--- /dev/null
+++ b/src/config/index.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# Entry point for the src/config/ module: only `source` lines and comments belong
+# here. build.sh emits a file's body before recursing into its `source` lines, so
+# any statement here would run before its dependencies in the built binary
+# (adrs/adr-010-src-module-directories.md).
+#
+# Run-scoped configuration and the state a run persists: every BASHUNIT_* default
+# and its scratch dirs (env), whether this run is parallel and its stop flag
+# (parallel), and the last-failed cache the next run reads (rerun). They cluster
+# for real -- env reads rerun's setting, parallel reads env's.
+#
+# env.sh is the one file here that executes at source time: it loads .bashunitrc
+# and .env and creates the scratch dirs. Its file-scope block calls only
+# bashunit::env:: functions defined above it in the same file, so the order below
+# is free -- but this module must stay where parallel.sh and env.sh sat, ahead of
+# console/, whose palette is built at file scope from these values.
+#
+# Note src/config/parallel.sh is a different concern from src/runner/parallel.sh:
+# this one answers "is this run parallel", that one waits on job slots.
+source "$BASHUNIT_ROOT_DIR/src/config/parallel.sh"
+source "$BASHUNIT_ROOT_DIR/src/config/env.sh"
+source "$BASHUNIT_ROOT_DIR/src/config/rerun.sh"
diff --git a/src/parallel.sh b/src/config/parallel.sh
similarity index 100%
rename from src/parallel.sh
rename to src/config/parallel.sh
diff --git a/src/rerun.sh b/src/config/rerun.sh
similarity index 100%
rename from src/rerun.sh
rename to src/config/rerun.sh
diff --git a/tests/unit/build_test.sh b/tests/unit/build_test.sh
index 281f4bb8..eecf385c 100644
--- a/tests/unit/build_test.sh
+++ b/tests/unit/build_test.sh
@@ -238,7 +238,7 @@ function test_build_process_file_emits_a_file_before_the_files_it_sources() {
 
 # The embed dedupe keys on the repo-relative path (#923). Two modules holding the
 # same basename must both survive -- the situation every further module split
-# creates (src/parallel.sh vs src/runner/parallel.sh today).
+# creates (src/config/parallel.sh vs src/runner/parallel.sh today).
 function test_build_process_file_embeds_same_basename_from_two_module_dirs() {
   local dir
   dir=$(bashunit::temp_dir)
diff --git a/tests/unit/env_deprecated_aliases_test.sh b/tests/unit/env_deprecated_aliases_test.sh
index de25ff9c..267a7f99 100644
--- a/tests/unit/env_deprecated_aliases_test.sh
+++ b/tests/unit/env_deprecated_aliases_test.sh
@@ -9,7 +9,7 @@
 # Every `: "${BASHUNIT_X:=${X:=...}}"` line in env.sh declares an unprefixed
 # alias for X. That is the source of truth.
 function bashunit::test::aliases_declared_in_env_sh() {
-  grep -oE '^: "\$\{BASHUNIT_[A-Z0-9_]+:=\$\{[A-Z0-9_]+:=' src/env.sh |
+  grep -oE '^: "\$\{BASHUNIT_[A-Z0-9_]+:=\$\{[A-Z0-9_]+:=' src/config/env.sh |
     sed -E 's/^: "\$\{BASHUNIT_[A-Z0-9_]+:=\$\{([A-Z0-9_]+):=$/\1/' |
     sort
 }