chore: upgrade Lambda runtime from nodejs22.x to nodejs24.x

Replace NODEJS_22_X with NODEJS_24_X across all nine Lambda NodejsFunction
definitions in lib/constructs/ (bedrock-agent, slack-handler, notion-sync,
po-sync, workorder-sync). Also add dependabot ignore for @types/node >=26
to prevent premature major bumps while we stay on the nodejs24.x runtime.

Both package.json files already carry @types/node ^24 — no pin change needed.

Refs #72

.github/dependabot.yml

@@ -9,6 +9,11 @@ updates:
         update-types:
           - "minor"
           - "patch"
+    ignore:
+      # Pinned to ^24 while Lambda runtime is nodejs24.x (upgraded from nodejs22.x).
+      # Node 26 is a mid-2027 eval — skip dependabot majors that would jump to @types/node@26.
+      - dependency-name: "@types/node"
+        versions: [">=26"]
   - package-ecosystem: "npm"
     directory: "/services/socket-mode"
     schedule:
@@ -18,3 +23,8 @@ updates:
         update-types:
           - "minor"
           - "patch"
+    ignore:
+      # Pinned to ^24 while Lambda runtime is nodejs24.x (upgraded from nodejs22.x).
+      # Node 26 is a mid-2027 eval — skip dependabot majors that would jump to @types/node@26.
+      - dependency-name: "@types/node"
+        versions: [">=26"]

lib/constructs/bedrock-agent.ts

@@ -53,7 +53,7 @@ export class BedrockAgentConstruct extends Construct {
       functionName: 'seahaven-qbo-lookup',
       entry: path.join(__dirname, '../../lambda/qbo-lookup/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.seconds(30),
@@ -72,7 +72,7 @@ export class BedrockAgentConstruct extends Construct {
       functionName: 'seahaven-maps-lookup',
       entry: path.join(__dirname, '../../lambda/maps-lookup/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.seconds(30),
@@ -105,7 +105,7 @@ export class BedrockAgentConstruct extends Construct {
       functionName: 'seahaven-wo-po-lookup',
       entry: path.join(__dirname, '../../lambda/wo-po-lookup/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.seconds(30),

lib/constructs/notion-sync.ts

@@ -38,7 +38,7 @@ export class NotionSyncConstruct extends Construct {
     this.syncLambda = new lambdaNodejs.NodejsFunction(this, 'SyncLambda', {
       functionName: 'seahaven-notion-sync',
       entry: path.join(__dirname, '../../lambda/notion-sync/index.ts'),
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       memorySize: 512,

lib/constructs/po-sync.ts

@@ -34,7 +34,7 @@ export class PoSyncConstruct extends Construct {
     this.syncLambda = new lambdaNodejs.NodejsFunction(this, 'SyncLambda', {
       functionName: 'seahaven-po-sync',
       entry: path.join(__dirname, '../../lambda/po-sync/index.ts'),
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       memorySize: 512,

lib/constructs/slack-handler.ts

@@ -49,7 +49,7 @@ export class SlackHandlerConstruct extends Construct {
       functionName: 'seahaven-slack-processor',
       entry: path.join(__dirname, '../../lambda/slack-processor/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.minutes(5),
@@ -82,7 +82,7 @@ export class SlackHandlerConstruct extends Construct {
       functionName: 'seahaven-app-home',
       entry: path.join(__dirname, '../../lambda/app-home/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.seconds(10),
@@ -110,7 +110,7 @@ export class SlackHandlerConstruct extends Construct {
       functionName: 'seahaven-qbo-oauth',
       entry: path.join(__dirname, '../../lambda/qbo-oauth/index.ts'),
       handler: 'handler',
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       timeout: cdk.Duration.seconds(15),

lib/constructs/workorder-sync.ts

@@ -37,7 +37,7 @@ export class WorkorderSyncConstruct extends Construct {
     this.syncLambda = new lambdaNodejs.NodejsFunction(this, 'SyncLambda', {
       functionName: 'seahaven-workorder-sync',
       entry: path.join(__dirname, '../../lambda/workorder-sync/index.ts'),
-      runtime: lambda.Runtime.NODEJS_22_X,
+      runtime: lambda.Runtime.NODEJS_24_X,
       architecture: lambda.Architecture.ARM_64,
       logRetention: logs.RetentionDays.TWO_MONTHS,
       memorySize: 512,