Restructure src/ to per-function layout with shared Layer

Move from flat src/ to per-function directories:
- src/slack-bot/ — Slack Bolt Lambda handler
- src/weekly-post/ — Monday schedule + pay post
- src/roster-sync/ — Daily 3CX roster sync
- src/shared/ — Lambda Layer with schedule, blocks, three_cx_client

Each function has its own requirements.txt and CodeUri. Shared
modules are deployed as a SAM Layer (afterhours-shared) importable
as `from shared.X import Y`.

.github/workflows/ci.yaml

@@ -7,4 +7,4 @@ jobs:
   ci:
     uses: Sea-Haven-Industries/.github/.github/workflows/ci-python-sam.yaml@main
     with:
-      source-dirs: "src"
+      source-dirs: "src/slack-bot src/weekly-post src/roster-sync src/shared/python/shared"

src/roster-sync/app.py

@@ -12,8 +12,8 @@ from zoneinfo import ZoneInfo
 
 import boto3
 
-from src.three_cx_client import ThreeCXClient
-from src.schedule import ShiftSchedule
+from shared.three_cx_client import ThreeCXClient
+from shared.schedule import ShiftSchedule
 
 logger = logging.getLogger()
 logger.setLevel(logging.INFO)

src/roster-sync/requirements.txt

@@ -0,0 +1,2 @@
+boto3>=1.43.6
+requests>=2.33.1

src/shared/requirements.txt

@@ -0,0 +1,2 @@
+boto3>=1.43.6
+requests>=2.33.1

src/slack-bot/app.py

@@ -10,14 +10,14 @@ from zoneinfo import ZoneInfo
 import boto3
 from slack_bolt import App
 
-from src.blocks import (
+from shared.blocks import (
     build_help_blocks,
     build_pay_summary_blocks,
     build_roster_blocks,
     build_shift_change_message,
     build_week_schedule,
 )
-from src.schedule import FALLBACK_EXTENSION, ShiftSchedule
+from shared.schedule import FALLBACK_EXTENSION, ShiftSchedule
 
 logger = logging.getLogger(__name__)
 EASTERN = ZoneInfo("America/New_York")

src/slack-bot/handler.py

@@ -6,7 +6,7 @@ import os
 import boto3
 from slack_bolt.adapter.aws_lambda import SlackRequestHandler
 
-from src.app import create_app
+from app import create_app
 
 logger = logging.getLogger()
 logger.setLevel(logging.INFO)

src/slack-bot/requirements.txt

@@ -1,3 +1,2 @@
 slack_bolt>=1.28.0,<2.0
 boto3>=1.43.6
-requests>=2.33.1

src/weekly-post/app.py

@@ -10,8 +10,8 @@ from zoneinfo import ZoneInfo
 import boto3
 from slack_sdk import WebClient
 
-from src.blocks import build_pay_summary_blocks, build_week_schedule
-from src.schedule import FALLBACK_EXTENSION, ShiftSchedule
+from shared.blocks import build_pay_summary_blocks, build_week_schedule
+from shared.schedule import FALLBACK_EXTENSION, ShiftSchedule
 
 logger = logging.getLogger()
 logger.setLevel(logging.INFO)

src/weekly-post/requirements.txt

@@ -0,0 +1,2 @@
+slack_sdk>=3.33.0,<4.0
+boto3>=1.43.6

template.yaml

@@ -20,6 +20,20 @@ Globals:
       - arm64
 
 Resources:
+  # --- Shared Lambda Layer ---
+  SharedLayer:
+    Type: AWS::Serverless::LayerVersion
+    Properties:
+      LayerName: afterhours-shared
+      ContentUri: src/shared/
+      CompatibleRuntimes:
+        - python3.12
+      CompatibleArchitectures:
+        - arm64
+    Metadata:
+      BuildMethod: python3.12
+      BuildArchitecture: arm64
+
   # --- DynamoDB ---
   ShiftTable:
     Type: AWS::DynamoDB::Table
@@ -42,8 +56,10 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       FunctionName: afterhours-shift-manager
-      Handler: src/handler.handler
-      CodeUri: .
+      Handler: handler.handler
+      CodeUri: src/slack-bot/
+      Layers:
+        - !Ref SharedLayer
       Environment:
         Variables:
           SHIFT_TABLE: !Ref ShiftTable
@@ -85,8 +101,10 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       FunctionName: afterhours-weekly-post
-      Handler: src/weekly_post.handler
-      CodeUri: .
+      Handler: app.handler
+      CodeUri: src/weekly-post/
+      Layers:
+        - !Ref SharedLayer
       Environment:
         Variables:
           SHIFT_TABLE: !Ref ShiftTable
@@ -138,8 +156,10 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       FunctionName: afterhours-roster-sync
-      Handler: src/roster_sync.handler
-      CodeUri: .
+      Handler: app.handler
+      CodeUri: src/roster-sync/
+      Layers:
+        - !Ref SharedLayer
       Timeout: 60
       Environment:
         Variables: