diff --git a/daily-perf-report-2026-02-17.md b/daily-perf-report-2026-02-17.md
index a510ffbd..890a3e93 100644
--- a/daily-perf-report-2026-02-17.md
+++ b/daily-perf-report-2026-02-17.md
@@ -1,6 +1,6 @@
 # Daily Performance Report - 2026-02-17
 
-**Summary:** Bounded concurrency for DM signal events and DM service initialization to prevent network saturation.
+**Summary:** Bounded concurrency for DM signal events and DM service initialization to prevent network saturation. Also fixed a CI failure related to `lint:hex` buffer size.
 
 ## Findings & Fixes
 
@@ -10,6 +10,10 @@
 - **Fix:** Replaced with `pMap` using `RELAY_BACKGROUND_CONCURRENCY` (3).
 - **Verification:** `npm run test:dm:unit` and `npm run test:dm:integration` passed.
 
+### CI Failure (lint:hex)
+- **Problem:** The `npm run lint:hex` script failed in CI with exit code 1 (and likely `ENOBUFS` internally) because `git grep` outputted large minified file contents that exceeded the default buffer size of `spawnSync`.
+- **Fix:** Increased `maxBuffer` in `scripts/check-hex.js` to 10MB.
+
 ### Docs Audit
 - **Port Alignment:** Verified `content/docs/guides/upload-content.md` correctly specifies port 3000 for CORS, aligning with previous remediation. No changes needed.
 
@@ -18,7 +22,7 @@
 - **DM Decrypt Queue:** N/A (network bounding).
 
 ## Decisions
-- Used `RELAY_BACKGROUND_CONCURRENCY` (3) for DM operations to match relay manager behavior.
+- Used `RELAY_BACKGROUND_CONCURRENCY || 3` for DM operations to match relay manager behavior and ensure robustness.
 
 ## PRs / Commits
-- `perf: bound DM subsystem network concurrency` (this change).
+- `perf: bound DM subsystem network concurrency & fix CI lint buffer`
diff --git a/docs/agents/task-logs/daily/2026-02-17_07-39-33_perf-agent_completed.md b/docs/agents/task-logs/daily/2026-02-17_07-39-33_perf-agent_completed.md
index d956350c..888af0d6 100644
--- a/docs/agents/task-logs/daily/2026-02-17_07-39-33_perf-agent_completed.md
+++ b/docs/agents/task-logs/daily/2026-02-17_07-39-33_perf-agent_completed.md
@@ -5,16 +5,19 @@
 **Goals:**
 - Identify and fix unbounded concurrency in network operations.
 - Audit upload documentation.
+- Fix CI failures.
 
 **Actions:**
 - **Identified:** Unbounded `Promise.all` usage in `js/nostr/dmSignalEvents.js` and `js/services/dmNostrService.js`.
-- **Fixed:** Replaced with `pMap` and `RELAY_BACKGROUND_CONCURRENCY` (3).
+- **Fixed:** Replaced with `pMap` and `RELAY_BACKGROUND_CONCURRENCY || 3`.
+- **Fixed CI:** Increased `maxBuffer` in `scripts/check-hex.js` to 10MB to prevent `ENOBUFS` when `git grep` matches large minified files.
 - **Verified:** Documentation in `content/docs/guides/upload-content.md` correctly specifies port 3000.
-- **Tested:** Unit and integration tests for DM subsystem passed.
+- **Tested:** Unit and integration tests for DM subsystem passed. Lint passed.
 
 **Files Changed:**
 - `js/nostr/dmSignalEvents.js`
 - `js/services/dmNostrService.js`
+- `scripts/check-hex.js`
 - `daily-perf-report-2026-02-17.md`
 - Context/Logs: `context/`, `todo/`, `decisions/`, `test_logs/`
 
diff --git a/js/nostr/dmSignalEvents.js b/js/nostr/dmSignalEvents.js
index 55f1aba6..23d83442 100644
--- a/js/nostr/dmSignalEvents.js
+++ b/js/nostr/dmSignalEvents.js
@@ -144,7 +144,7 @@ export async function publishDmReadReceipt(
   const publishResults = await pMap(
     relayList,
     (url) => publishEventToRelay(client.pool, url, signedEvent),
-    { concurrency: RELAY_BACKGROUND_CONCURRENCY },
+    { concurrency: RELAY_BACKGROUND_CONCURRENCY || 3 },
   );
 
   const acceptedRelays = publishResults
@@ -287,7 +287,7 @@ export async function publishDmTypingIndicator(
   const publishResults = await pMap(
     relayList,
     (url) => publishEventToRelay(client.pool, url, signedEvent),
-    { concurrency: RELAY_BACKGROUND_CONCURRENCY },
+    { concurrency: RELAY_BACKGROUND_CONCURRENCY || 3 },
   );
 
   const acceptedRelays = publishResults
diff --git a/js/services/dmNostrService.js b/js/services/dmNostrService.js
index 6b2113f7..8e02ae51 100644
--- a/js/services/dmNostrService.js
+++ b/js/services/dmNostrService.js
@@ -279,7 +279,7 @@ class DmNostrService {
       async (relayUrl) => {
         await this.connectRelay(relayUrl);
       },
-      { concurrency: RELAY_BACKGROUND_CONCURRENCY },
+      { concurrency: RELAY_BACKGROUND_CONCURRENCY || 3 },
     );
   }
 
@@ -680,7 +680,7 @@ class DmNostrService {
 
         return { ...result, relayUrl };
       },
-      { concurrency: RELAY_BACKGROUND_CONCURRENCY },
+      { concurrency: RELAY_BACKGROUND_CONCURRENCY || 3 },
     );
 
     return results;
diff --git a/scripts/check-hex.js b/scripts/check-hex.js
index ee1a56b3..46cf96ad 100755
--- a/scripts/check-hex.js
+++ b/scripts/check-hex.js
@@ -55,7 +55,8 @@ for (const glob of IGNORED_GLOBS) {
 
 // We rely on 'git' being available and 'git grep' supporting -P.
 // Typically available in most CI/dev environments.
-const result = spawnSync('git', gitArgs, { encoding: 'utf8' });
+// Increase maxBuffer to 10MB to prevent ENOBUFS on large minified files
+const result = spawnSync('git', gitArgs, { encoding: 'utf8', maxBuffer: 10 * 1024 * 1024 });
 
 if (result.error) {
   console.error('Failed to execute git grep:', result.error.message);