Split the session, gate optional parameters on the peer version, own the SMPP version in defs

eslint.config.js

@@ -24,6 +24,29 @@ export default tseslint.config(
 			'no-console': 'error',
 		},
 	},
+	{
+		files: ['src/**/*.ts'],
+		rules: {
+			complexity: ['error', 10],
+			'max-lines': ['error', { max: 350, skipBlankLines: true, skipComments: true }],
+			'max-lines-per-function': ['error', { max: 40, skipBlankLines: true, skipComments: true }],
+			'max-params': ['error', 5],
+		},
+	},
+	{
+		// The spec tables are data: their length tracks the specification, not any complexity.
+		files: ['src/defs/*.ts'],
+		rules: { 'max-lines': 'off' },
+	},
+	{
+		// The codec branches per wire type and per parameter; splitting it scatters the wire format
+		// across files instead. These two keep the ceiling they have today.
+		files: ['src/dlr.ts', 'src/pdu.ts'],
+		rules: {
+			complexity: ['error', 22],
+			'max-lines-per-function': ['error', { max: 75, skipBlankLines: true, skipComments: true }],
+		},
+	},
 	{
 		// ESC (0x1B) is the GSM 03.38 escape character, so it belongs in these patterns.
 		files: ['src/defs/encodings.ts'],