feat: add rtk sqlfluff lint with JSON filter (~75% token reduction)

README.md

@@ -175,6 +175,7 @@ rtk pytest                       # Python tests (failures only, 90% reduction)
 rtk pip list                     # Python packages (auto-detect uv, 70% reduction)
 rtk go test                      # Go tests (NDJSON, 90% reduction)
 rtk golangci-lint run            # Go linting (JSON, 85% reduction)
+rtk sqlfluff lint                # SQL linting (JSON, 75% reduction)
 ```
 
 ### Data & Analytics
@@ -276,6 +277,7 @@ rtk pytest                       # Test failures with state machine parser (90%
 rtk pip list                     # Package list (auto-detect uv, 70% reduction)
 rtk pip install <package>        # Install with compact output
 rtk pip outdated                 # Outdated packages (85% reduction)
+rtk sqlfluff lint                # SQL linter, group violations by rule/file (75% reduction)
 
 # Go
 rtk go test                      # NDJSON streaming parser (90% reduction)
@@ -625,6 +627,7 @@ The hook is included in this repository at `.claude/hooks/rtk-rewrite.sh`. To us
 | `pip list/install/outdated` | `rtk pip ...` |
 | `go test/build/vet` | `rtk go ...` |
 | `golangci-lint run` | `rtk golangci-lint run` |
+| `sqlfluff lint` | `rtk sqlfluff lint` |
 | `docker ps/images/logs` | `rtk docker ...` |
 | `kubectl get/logs` | `rtk kubectl ...` |
 | `curl` | `rtk curl` |

src/main.rs

@@ -38,6 +38,7 @@ mod pytest_cmd;
 mod read;
 mod ruff_cmd;
 mod runner;
+mod sqlfluff_cmd;
 mod summary;
 mod tee;
 mod tracking;
@@ -502,6 +503,13 @@ enum Commands {
         args: Vec<String>,
     },
 
+    /// SQLFluff SQL linter with compact output
+    Sqlfluff {
+        /// SQLFluff arguments (e.g., lint models/, fix models/staging/)
+        #[arg(trailing_var_arg = true, allow_hyphen_values = true)]
+        args: Vec<String>,
+    },
+
     /// Pytest test runner with compact output
     Pytest {
         /// Pytest arguments
@@ -1400,6 +1408,10 @@ fn main() -> Result<()> {
             ruff_cmd::run(&args, cli.verbose)?;
         }
 
+        Commands::Sqlfluff { args } => {
+            sqlfluff_cmd::run(&args, cli.verbose)?;
+        }
+
         Commands::Pytest { args } => {
             pytest_cmd::run(&args, cli.verbose)?;
         }