fix: add .catch() to all fire-and-forget saveSessionState calls

Replaced 6 'void saveSessionState(state, logger)' calls with 'saveSessionState(state, logger).catch(() => {})' in hooks.ts and inject.ts.

Root cause: with dynamic STORAGE_DIR, fire-and-forget saves now write to test temp dirs. When tests delete the temp dir, pending writes fail with ENOENT, triggering unhandledRejection. The .catch() handler silently absorbs these errors — consistent with the existing pattern in state.ts:56.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: ranxianglei

lib/hooks.ts

@@ -158,7 +158,7 @@ function runMajorGC(
             agedOutTokens,
             maxBlockAge,
         })
-        void saveSessionState(state, logger)
+        saveSessionState(state, logger).catch(() => {})
     }
 
     if (!state.modelContextLimit) return
@@ -202,7 +202,7 @@ function runMajorGC(
             currentTokens,
             threshold: config.gc.majorGcThresholdPercent,
         })
-        void saveSessionState(state, logger)
+        saveSessionState(state, logger).catch(() => {})
     }
 }
 
@@ -246,14 +246,14 @@ export function createChatMessageTransformHandler(
         const activeBlockCountBefore = state.prune.messages.activeBlockIds.size // [FIX Bug 4]
         syncCompressionBlocks(state, logger, output.messages)
         if (state.prune.messages.activeBlockIds.size !== activeBlockCountBefore) { // [FIX Bug 4]
-            void saveSessionState(state, logger) // [FIX Bug 4] persist deactivations
+            saveSessionState(state, logger).catch(() => {}) // [FIX Bug 4] persist deactivations
         }
         syncToolCache(state, config, logger, output.messages)
         buildToolIdList(state, output.messages)
         runMajorGC(state, config, logger, output.messages)
         const batchResult = runBatchCleanup(state, config, logger, output.messages)
         if (batchResult.mergedCount > 0) {
-            void saveSessionState(state, logger)
+            saveSessionState(state, logger).catch(() => {})
         }
         prune(state, logger, config, output.messages)
         // [FIX Bug 2] assign refs to newly created synthetic messages from prune/filterCompressedRanges

lib/messages/inject/inject.ts

@@ -91,7 +91,7 @@ export const injectCompressNudges = (
         state.nudges.turnNudgeAnchors.clear()
         state.nudges.iterationNudgeAnchors.clear()
         state.nudges.lastPerMessageNudgeTokens = currentTokens
-        void saveSessionState(state, logger)
+        saveSessionState(state, logger).catch(() => {})
         return
     }
 
@@ -229,7 +229,7 @@ export const injectCompressNudges = (
     }
 
     if (anchorsChanged) {
-        void saveSessionState(state, logger)
+        saveSessionState(state, logger).catch(() => {})
     }
 }