Add CLAUDE.md guide and update skipped tests list

- Add CLAUDE.md with instructions for continuing parser development
- Update skipped_tests_by_size.txt to reflect 998 remaining skipped tests

Author: claude

CLAUDE.md

@@ -0,0 +1,47 @@
+# Claude Development Guide
+
+## Next Steps
+
+To continue implementing parser support for skipped tests, consult:
+
+```
+skipped_tests_by_size.txt
+```
+
+This file lists all skipped tests ordered by query file size (smallest first). Smaller tests are generally simpler to implement.
+
+## Workflow
+
+1. Pick tests from `skipped_tests_by_size.txt` starting from the top
+2. Check the test's `query.sql` to understand what SQL needs parsing
+3. Check the test's `ast.json` to understand the expected output format
+4. Implement the necessary AST types in `ast/`
+5. Add parser logic in `parser/parser.go`
+6. Add JSON marshaling functions in `parser/parser.go`
+7. Enable the test by setting `{"skip": false}` in its `metadata.json`
+8. Run `go test ./parser/...` to verify
+9. **Update `skipped_tests_by_size.txt`** after enabling tests
+
+## Updating skipped_tests_by_size.txt
+
+After enabling tests, regenerate the file:
+
+```bash
+cd parser/testdata
+for dir in */; do
+  if [ -f "$dir/metadata.json" ] && grep -q '"skip": true' "$dir/metadata.json" 2>/dev/null; then
+    if [ -f "$dir/query.sql" ]; then
+      size=$(wc -c < "$dir/query.sql")
+      name="${dir%/}"
+      echo "$size $name"
+    fi
+  fi
+done | sort -n > ../../skipped_tests_by_size.txt
+```
+
+## Test Structure
+
+Each test in `parser/testdata/` contains:
+- `metadata.json` - `{"skip": true}` or `{"skip": false}`
+- `query.sql` - T-SQL to parse
+- `ast.json` - Expected AST output

skipped_tests_by_size.txt

@@ -157,7 +157,6 @@
 117 Baselines90_CreateMasterKeyStatementTests
 118 Baselines100_DeclareVariableWithAssignmentTests
 118 Baselines130_AlterTableSwitchStatementTests130
-118 BaselinesCommon_RollbackTransactionStatementTests
 120 VariableTests
 123 Baselines100_AlterIndexStatementTests100
 124 AcceleratedDatabaseRecoveryTests150
@@ -178,14 +177,12 @@
 135 SimpleJsonObjectReturn160
 136 Baselines160_ShiftOperatorTests160
 136 Baselines90_WaitForStatementTests90
-136 CreateDefaultStatementTests
 136 GetConversationGroupStatementTests
 137 Baselines90_CreateCredentialStatementTests
 138 Baselines90_AlterXmlSchemaCollectionStatementTests
 138 Baselines90_CreateContractStatementTests
 140 Baselines90_GetConversationGroupStatementTests
 141 Baselines100_BackupStatementTests100
-141 BaselinesCommon_WaitForStatementTests
 143 AlterIndexStatementTests100
 143 AlterTriggerStatementTests
 145 Baselines130_AlterDatabaseScopedCredentialStatementTests130
@@ -194,7 +191,6 @@
 149 DeclareVariableElementTest
 150 Baselines150_DeclareTableVariableTests150
 150 Baselines90_CreateSynonymStatementTests
-154 BaselinesCommon_CommitTransactionStatementTests
 154 CreateRuleStatementTests
 154 TestJsonArrayReturn160
 157 BaselinesCommon_AlterTableTriggerModificationStatementTests
@@ -214,14 +210,12 @@
 170 Baselines90_AlterSchemaStatementTests
 171 ReadTextStatementTests
 172 CreateDatabaseScopedCredentialStatementTests130
-172 CreateMasterKeyStatementTests
 174 DropStatementsTests110
 175 CreateSearchPropertyListStatementTests
 178 Baselines110_UseFederationTests110
 179 Baselines110_CreateSearchPropertyListStatementTests
 180 BackupStatementTests100
 181 Baselines90_AlterRemoteServiceBindingStatementTests
-181 CommitTransactionStatementTests
 181 CreateAlterFederationStatementTestsAzure110
 182 Baselines110_DropStatementsTests110
 183 Baselines100_QueueStatementTests100
@@ -231,10 +225,8 @@
 184 Baselines110_CreateAlterFederationStatementTestsAzure110
 184 BaselinesCommon_SaveTransactionStatementTests
 185 CreatePartitionFunctionStatementTests
-187 WaitForStatementTests
 189 CreateCredentialStatementTests100
 192 GotoStatementTests
-193 RollbackTransactionStatementTests
 194 AlterServerConfigurationStatementTests
 194 BaselinesCommon_AlterTableConstraintModificationStatementTests
 196 Baselines100_AlterServerConfigurationStatementTests