Update deployment_strategy.md: SSEP→SMEP, service→machine registry

- Changed UID scheme name from SSEP to SMEP
- Updated SS (Service) to M (Machine) throughout
- Renamed Service Registry section to Machine Registry
- Updated registry paths from service-registry to machine-registry
- Updated port allocation table headers

docs/deployment_strategy.md

···
 
 ## UID Convention
 
-All Docker service users follow a 5-digit UID scheme called **SSEP**:
+All Docker machine users follow a 5-digit UID scheme called **SMEP**:
 
-**S-SS-E-P** where each digit represents:
+**S-M-E-P** where each digit represents:
 
 - **S** (Sheet): `1-5` = Sheet number (dynamically calculated from sheet name)
-- **SS** (Service): `00-99` = Service number within the sheet (2-digit)
+- **M** (Machine): `00-99` = Machine number within the sheet (2-digit)
 - **E** (Environment): `0-9` = Environment number (expanded from 2 to 10 environments)
 - **P** (Port Index): `0-9` = Port index, incremented for additional ports
 
-### SSEP Implementation
+### SMEP Implementation
 
 The UID is calculated during `machine/setup.sh` based on the inputs:
 
 ```bash
 # Example: ./machine/setup.sh gazette prod DS412plus
-TIN_SERVICE_UID=$(calculate_service_uid "gazette" "prod")
-# Result: 10100 (S=1, SS=01, E=0, P=0)
+TIN_SERVICE_UID=$(calculate_machine_uid "gazette" "prod")
+# Result: 10100 (S=1, M=01, E=0, P=0)
 ```
 
-**Service Number Mapping (SS digits):**
+**Machine Number Mapping (M digits):**
 - `00` = station (sheet infrastructure: registry, shared config)
-- `01` = gazette (first service)
+- `01` = gazette (first machine)
 - `02` = lldap (identity management)
-- `03` = gateway (gateway service)
-- `04-99` = Additional services (auto-assigned or manually configured)
+- `03` = gateway (gateway machine)
+- `04-99` = Additional machines (auto-assigned or manually configured)
 
 **Port Allocation from UID:**
 The same UID serves as the base port number. Additional ports increment the P digit:
···
 - `10180` = gazette-canary (E:8)
 - `10190` = gazette-local (E:9)
 
-## Sheet Station (SS=00)
+## Sheet Station (M=00)
 
-The sheet station (SS=00) provides infrastructure services for the sheet:
+The sheet station (M=00) provides infrastructure services for the sheet:
 
-### Service Registry
-Located at `/volume1/{sheet}/station/prod/service-registry`, this file maps service names to numbers in the example form:
+### Machine Registry
+Located at `/volume1/{sheet}/station/prod/machine-registry`, this file maps machine names to numbers in the example form:
 ```
 gazette=01
 lldap=02
···
 ```
 /volume1/{sheet}/station/
 ├── prod/                      # UID: N0000
-│   ├── service-registry       # Service name to number mapping
+│   ├── machine-registry       # Machine name to number mapping
 │   ├── port-allocations       # Track allocated ports (optional)
 │   └── config/                # Shared sheet configuration
 └── test/                      # UID: N0010
-    └── service-registry       # Test environment registry
+    └── machine-registry       # Test environment registry
 ```
 
 ### Access Permissions
-- The station exports are readable by all service users in the sheet
+- The station exports are readable by all machine users in the sheet
 - Only administrators can write to the registry
-- Services consult the registry during deployment to determine their service number
+- Machines consult the registry during deployment to determine their machine number
 
 ## Port Allocation Strategy
 
···
 
 ### Port Allocation Table
 
-| Service | Environment | SSEP UID | Primary Port | Secondary Port | API Port |
+| Machine | Environment | SMEP UID | Primary Port | Secondary Port | API Port |
 |---------|-------------|----------|--------------|----------------|----------|
 | station | prod | 10000 | 10000 | 10001 | 10002 |
 | station | test | 10010 | 10010 | 10011 | 10012 |