diff --git a/docs/proposed-rust-module-conventions.md b/docs/proposed-rust-module-conventions.md
index 5e72dfcc..e137316d 100644
--- a/docs/proposed-rust-module-conventions.md
+++ b/docs/proposed-rust-module-conventions.md
@@ -89,7 +89,7 @@ argues for doing it where it helps and against treating it as risky.
 ## Where the general advice does not fit this repository
 
 This codebase has a constraint most advice does not consider: **files are
-pinned**. `docs/tally/compatibility/compatibility-surface.json` binds 218 paths
+pinned**. `docs/tally/compatibility/compatibility-surface.json` binds each pinned path
 by SHA-256, and the evidence receipts beneath it attest behaviour *of those
 bytes*. Splitting a pinned file is not a neutral move:
 
diff --git a/docs/tally/compatibility/compatibility-matrix.json b/docs/tally/compatibility/compatibility-matrix.json
index 7a55f200..ffc61449 100644
--- a/docs/tally/compatibility/compatibility-matrix.json
+++ b/docs/tally/compatibility/compatibility-matrix.json
@@ -1,7 +1,7 @@
 {
   "schema_version": 1,
   "bridge_commit_sha": "be1c20cc3fd66fa1ece196505c69f26e555e4b8e",
-  "compatibility_surface_sha256": "4dc0c7118372a4bc4a6b3b58346b0b113ce4b6bb07a154f208546f6cd43757a8",
+  "compatibility_surface_sha256": "17dcd4722234ab278f55d130b00151b71ae797f6a1a7cf18246f08ab82f21915",
   "claims": [
     {
       "claim_id": "erp9-6-6-3-windows-education-xml-one-company",
diff --git a/docs/tally/compatibility/compatibility-surface.json b/docs/tally/compatibility/compatibility-surface.json
index 4030a2a4..088f022f 100644
--- a/docs/tally/compatibility/compatibility-surface.json
+++ b/docs/tally/compatibility/compatibility-surface.json
@@ -341,6 +341,14 @@
       "path": "src-tauri/src/agent_catalog.rs",
       "sha256": "55632c680704c2784545e422cf6847b81d2423191d651a0119d45188d9bf2671"
     },
+    {
+      "path": "src-tauri/src/agent_change_parse.rs",
+      "sha256": "1459a3a732ed5f4e51c0b83481683ebbf26adb86b6c3cc10da8604ac03bd3823"
+    },
+    {
+      "path": "src-tauri/src/agent_changes.rs",
+      "sha256": "ce8c0ca98c2194f8ce42493a39f3a034f80418bcf4c6aa3d9fc9df30a6161f71"
+    },
     {
       "path": "src-tauri/src/agent_company.rs",
       "sha256": "c719ff31cb8e14959dcaecd851156356cc7e38fe50a07aaf0dd339cfd78641dc"
@@ -385,6 +393,18 @@
       "path": "src-tauri/src/agent_ledgers.rs",
       "sha256": "a891e4ac51addc9dc17ae28ce4634bd2cfeb8f3f0df78e072290771d29a3131b"
     },
+    {
+      "path": "src-tauri/src/agent_movement.rs",
+      "sha256": "a1ca27209a17a23db26b72d190122b8be49a930b55151ecea59913126b599185"
+    },
+    {
+      "path": "src-tauri/src/agent_movement_math.rs",
+      "sha256": "5047954d7f0e5c7adfc31241bab4108a734f1f815102e95f78f080a66228bdf9"
+    },
+    {
+      "path": "src-tauri/src/agent_outstandings.rs",
+      "sha256": "93538acb8e43a1a02891d0cc5b9e8615daf10d4493eebe18cc431cc3425c7fc3"
+    },
     {
       "path": "src-tauri/src/agent_presence.rs",
       "sha256": "0bfeb05248b0d371e6a87b4b004c9c3815b5590017c6bd3231277db12b030c8d"
@@ -405,6 +425,10 @@
       "path": "src-tauri/src/agent_read_validation.rs",
       "sha256": "7c1bf2bc330b9703e0b2ae791ae7d777b6c64449395ff79b7ef855ee0dafdfeb"
     },
+    {
+      "path": "src-tauri/src/agent_receipt_fields.rs",
+      "sha256": "cbdd09b7916fe5b96c7be4cecab9e0bdf2f0cdb018148c106a83e026a9128ada"
+    },
     {
       "path": "src-tauri/src/agent_responses.rs",
       "sha256": "dfa582e79dab46315de88ba68c7dca069566da20b67733558a38cdd714f5c3b4"
@@ -895,7 +919,7 @@
     },
     {
       "path": "tools/bridge-tally-compatibility/src/lib.rs",
-      "sha256": "8f9840b107e3c14290e66a7e9eeafce09930fb7d17286a35c9475d1af87b6062"
+      "sha256": "8ad5d452bb3f76e3d1ee69c78c0a564af2263392ffb0c47f58ed49c837eb6692"
     },
     {
       "path": "tools/bridge-tally-compatibility/src/main.rs",
@@ -930,5 +954,5 @@
       "sha256": "a8ac2714fecf51947f2822c8c46d7ce2e8602c732780ff60566a7771f0836f9a"
     }
   ],
-  "manifest_sha256": "4dc0c7118372a4bc4a6b3b58346b0b113ce4b6bb07a154f208546f6cd43757a8"
+  "manifest_sha256": "17dcd4722234ab278f55d130b00151b71ae797f6a1a7cf18246f08ab82f21915"
 }
\ No newline at end of file
diff --git a/src-tauri/tests/admission_and_egress_files_stay_pinned.rs b/src-tauri/tests/admission_and_egress_files_stay_pinned.rs
index 6296dc48..befac991 100644
--- a/src-tauri/tests/admission_and_egress_files_stay_pinned.rs
+++ b/src-tauri/tests/admission_and_egress_files_stay_pinned.rs
@@ -1,11 +1,11 @@
-//! The fourteen files pinned by the raise to 232 (bridge#416) must stay pinned.
+//! The files pinned by the raises to 232 and 238 (bridge#416) must stay pinned.
 //!
 //! The compatibility gate cannot notice a pin disappearing. `rehash-surface`
 //! updates hashes and never adds paths. `docs/release-process.md` requires the
 //! pin list to be merged rather than resolved by taking one side; a resolution
 //! that takes the base side anyway drops every entry a branch added while
 //! keeping the raised `MAX_SURFACE_FILES`, and the gate passes. So does the cap
-//! assertion, which bounds headroom and would pass with all fourteen dropped.
+//! assertion, which bounds headroom and would pass with all of them dropped.
 //! `book_presence_tests.rs` guards its own contract's pins the same way.
 //!
 //! This file is deliberately not pinned itself: a guard that lived in the
@@ -35,6 +35,17 @@ const ADMISSION_AND_EGRESS: [&str; 14] = [
     "src-tauri/src/tally/runtime_control.rs",
 ];
 
+/// The six files pinned by the raise to 238: five on the read path, and the
+/// egress receipt's field walker. Reasons live beside `MAX_SURFACE_FILES`.
+const READ_PATH_AND_RECEIPT: [&str; 6] = [
+    "src-tauri/src/agent_change_parse.rs",
+    "src-tauri/src/agent_changes.rs",
+    "src-tauri/src/agent_movement.rs",
+    "src-tauri/src/agent_movement_math.rs",
+    "src-tauri/src/agent_outstandings.rs",
+    "src-tauri/src/agent_receipt_fields.rs",
+];
+
 fn pinned_paths(surface: &str) -> BTreeSet<String> {
     let surface: serde_json::Value = serde_json::from_str(surface).expect("surface json");
     surface["files"]
@@ -53,9 +64,8 @@ fn unpinned<'a>(pinned: &BTreeSet<String>, required: &[&'a str]) -> Vec<&'a str>
         .collect()
 }
 
-#[test]
-fn admission_and_egress_files_are_still_pinned() {
-    let missing = unpinned(&pinned_paths(SURFACE), &ADMISSION_AND_EGRESS);
+fn assert_still_pinned(required: &[&str]) {
+    let missing = unpinned(&pinned_paths(SURFACE), required);
     assert!(
         missing.is_empty(),
         "dropped from the compatibility surface: {missing:?}. A merge that took \
@@ -65,17 +75,29 @@ fn admission_and_egress_files_are_still_pinned() {
     );
 }
 
+#[test]
+fn admission_and_egress_files_are_still_pinned() {
+    assert_still_pinned(&ADMISSION_AND_EGRESS);
+}
+
+#[test]
+fn read_path_and_receipt_files_are_still_pinned() {
+    assert_still_pinned(&READ_PATH_AND_RECEIPT);
+}
+
 /// The check above must be able to fail. Drive the same two functions over the
 /// real surface with one entry removed, rather than a hand-built fixture that
 /// would only prove `BTreeSet::contains` works.
 #[test]
 fn the_pin_check_reports_a_dropped_entry() {
-    let dropped = ADMISSION_AND_EGRESS[0];
-    let mut surface: serde_json::Value = serde_json::from_str(SURFACE).expect("surface json");
-    surface["files"]
-        .as_array_mut()
-        .expect("surface files")
-        .retain(|entry| entry["path"].as_str() != Some(dropped));
-    let pinned = pinned_paths(&surface.to_string());
-    assert_eq!(unpinned(&pinned, &ADMISSION_AND_EGRESS), vec![dropped]);
+    for required in [&ADMISSION_AND_EGRESS[..], &READ_PATH_AND_RECEIPT[..]] {
+        let dropped = required[0];
+        let mut surface: serde_json::Value = serde_json::from_str(SURFACE).expect("surface json");
+        surface["files"]
+            .as_array_mut()
+            .expect("surface files")
+            .retain(|entry| entry["path"].as_str() != Some(dropped));
+        let pinned = pinned_paths(&surface.to_string());
+        assert_eq!(unpinned(&pinned, required), vec![dropped]);
+    }
 }
diff --git a/tools/bridge-tally-compatibility/src/lib.rs b/tools/bridge-tally-compatibility/src/lib.rs
index 76c2509f..5be9073a 100644
--- a/tools/bridge-tally-compatibility/src/lib.rs
+++ b/tools/bridge-tally-compatibility/src/lib.rs
@@ -31,7 +31,7 @@ pub const RESERVED_SURFACE_FILES: usize = 15;
 /// and manifest) but makes further unreviewed additions an explicit
 /// compatibility-surface decision.
 ///
-/// **Raised six times, the first three by branches that did not see each
+/// **Raised seven times, the first three by branches that did not see each
 /// other.** 210 to 211 on master for `src-tauri/src/agent_ledgers.rs`, 211 to
 /// 212 for `src-tauri/crates/bridge-tally-core/src/master_binding.rs`, 212 to
 /// 216 in a single commit for the voucher-presence engine, its adapter, its
@@ -39,8 +39,9 @@ pub const RESERVED_SURFACE_FILES: usize = 15;
 /// taking the slot a paragraph below had already reserved for it by name, which
 /// is why the four pins arrive as one raise and not two -- 216 to 217 for
 /// `.github/workflows/dependency-security-scheduled.yml`, 217 to 218 for
-/// `src-tauri/src/agent_import_identity.rs`, and 218 to 232 for fourteen files
-/// named individually below. Each reason stands; a merge that
+/// `src-tauri/src/agent_import_identity.rs`, 218 to 232 for fourteen files
+/// named individually below, and 232 to 238 for six more. Each reason stands; a
+/// merge that
 /// keeps a raise but loses its pin would pass the gate with behavior silently
 /// outside the evidence boundary, which is the failure this constant exists to
 /// make loud.
@@ -121,13 +122,45 @@ pub const RESERVED_SURFACE_FILES: usize = 15;
 ///   the response hash it commits to, and that only a persisted preparation
 ///   yields a write-completion token.
 ///
+/// The raise to 238 binds six more files from the same bridge#416 search. Five
+/// decide what a read tells a caller, or when a sync may move past rows. The
+/// sixth, `agent_receipt_fields.rs`, belongs with the egress record above:
+/// bridge#416 listed it as borderline rather than with the fourteen, and it
+/// describes the response of any tool, not only a read. Same rule: each reason
+/// says what the file holds.
+///
+/// What a read reports, or lets a sync skip:
+/// - `agent_movement.rs` -- the ledger movement tool, and the voucher predicate
+///   it applies after checking the whole window: cancelled, optional and
+///   entryless vouchers are left out of the movement figures.
+/// - `agent_movement_math.rs` -- one ledger's movement row: when an opening was
+///   observed, closing is opening plus debit plus credit; when none was, closing
+///   is left empty and the row is marked `partial` with
+///   `opening_balance_not_observed`.
+/// - `agent_outstandings.rs` -- the outstandings tool's receivable and payable
+///   totals over open bills, and its ageing buckets (0-30, 31-60, 61-90, over 90
+///   days, and unaged).
+/// - `agent_change_parse.rs` -- `checkpoint_advanceable`: true when a page was
+///   not truncated and its highest returned alter id, or the requested
+///   checkpoint when it returned none, reaches the company's high-water mark.
+/// - `agent_changes.rs` -- the changed-since tool, which applies that predicate
+///   to vouchers and masters separately, reports `checkpoint_advanceable` only
+///   when both hold, chooses each axis's next alter id from its own result, and
+///   refuses a checkpoint past the company snapshot.
+///
+/// And the egress record:
+/// - `agent_receipt_fields.rs` -- `released_fields`, which the egress receipt in
+///   `agent_delivery.rs` uses to describe a released tool response by its JSON
+///   key paths rather than its values.
+///
 /// Not pinned, and deliberately: files feature-gated out of every shipped build
 /// (`agent_lab.rs`, `jsonex*.rs`, `india_tax_observation.rs`), operator filing
-/// labels, dead or declaration-only modules, and the read-path files that
-/// compute reported figures or decide when a change cursor may advance. Those
-/// decide what a read says, not what is admitted or where data may go; they are
-/// the next candidates if the boundary widens, and bridge#416 records why.
-pub const MAX_SURFACE_FILES: usize = 232;
+/// labels, dead or declaration-only modules, and `observability.rs`. Its count
+/// bucketing is a real privacy reduction, and the `tally_telemetry_preview`
+/// command returns what it builds, but nothing in the frontend calls that
+/// command and nothing sends its result off the machine. It becomes a candidate
+/// when something does. bridge#416 records the reasoning for the rest.
+pub const MAX_SURFACE_FILES: usize = 238;
 pub const MAX_OPERATIONS: usize = 16;
 pub const MAX_CLAIMS: usize = 128;
 pub const MAX_KEYS: usize = 32;