feat: add PII redaction plugin crate with local backend

ATTRIBUTIONS-Rust.md

@@ -32413,6 +32413,215 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 
 ```
 
+## sha2 - 0.10.9
+**Repository URL**: https://github.com/RustCrypto/hashes
+**License Type(s)**: Apache-2.0
+### License: https://spdx.org/licenses/Apache-2.0.html
+```
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+```
+
 ## sha2 - 0.11.0
 **Repository URL**: https://github.com/RustCrypto/hashes
 **License Type(s)**: Apache-2.0

Cargo.toml

@@ -5,6 +5,7 @@
 members = [
     "crates/core",
     "crates/adaptive",
+    "crates/pii-redaction",
     "crates/cli",
     # Language Bindings
     "crates/python",
@@ -24,6 +25,7 @@ repository = "https://github.com/NVIDIA/NeMo-Relay"
 [workspace.dependencies]
 nemo-relay = { version = "0.4.0", path = "crates/core", default-features = false }
 nemo-relay-adaptive = { version = "0.4.0", path = "crates/adaptive" }
+nemo-relay-pii-redaction = { version = "0.4.0", path = "crates/pii-redaction" }
 nemo-relay-ffi = { version = "0.4.0", path = "crates/ffi" }
 nemo-relay-cli = { version = "0.4.0", path = "crates/cli" }
 opentelemetry = { version = "0.31", default-features = false }

crates/cli/Cargo.toml

@@ -27,6 +27,7 @@ atof-streaming = ["nemo-relay/atof-streaming"]
 [dependencies]
 nemo-relay = { workspace = true, features = ["guardrails-remote", "object-store", "openinference"] }
 nemo-relay-adaptive = { workspace = true, features = ["redis-backend"] }
+nemo-relay-pii-redaction.workspace = true
 async-stream = "0.3"
 axum = "0.8"
 bytes = "1"

crates/cli/src/doctor.rs

@@ -19,6 +19,7 @@ use nemo_relay::codec::pricing::{PricingCatalog, PricingConfig, PricingSourceCon
 use nemo_relay::observability::plugin_component::OBSERVABILITY_PLUGIN_KIND;
 use nemo_relay::plugin::{DiagnosticLevel, PluginConfig, validate_plugin_config};
 use nemo_relay_adaptive::plugin_component::register_adaptive_component;
+use nemo_relay_pii_redaction::component::register_pii_redaction_component;
 use serde::Serialize;
 use serde_json::{Value, json};
 use tokio::time::timeout;
@@ -607,6 +608,14 @@ async fn collect_observability(gateway: &GatewayConfig) -> Vec<Check> {
         });
         return checks;
     }
+    if let Err(error) = register_pii_redaction_component() {
+        checks.push(Check {
+            name: "PII redaction plugin",
+            status: Status::Fail,
+            details: format!("registration failed: {error}"),
+        });
+        return checks;
+    }
     let report = validate_plugin_config(&plugin_config);
     if report.diagnostics.is_empty() {
         checks.push(Check {

crates/cli/src/plugins.rs

@@ -280,6 +280,10 @@ fn edit_component_field(
             edit_config_field(theme, &mut state.config, field)?;
             state.mark_config_touched();
         }
+        EditableComponent::PiiRedaction(state) => {
+            edit_config_field(theme, &mut state.config, field)?;
+            state.mark_config_touched();
+        }
     }
     Ok(())
 }

crates/cli/src/plugins/config_io.rs

@@ -8,6 +8,7 @@ use std::path::{Path, PathBuf};
 use console::style;
 use nemo_relay::plugin::{ConfigPolicy, PluginConfig, validate_plugin_config};
 use nemo_relay_adaptive::plugin_component::register_adaptive_component;
+use nemo_relay_pii_redaction::component::register_pii_redaction_component;
 use serde_json::{Map, Value};
 
 use crate::config::{
@@ -119,6 +120,9 @@ pub(crate) fn validate_config(config: &PluginConfig) -> Result<(), CliError> {
     register_adaptive_component().map_err(|error| {
         CliError::Config(format!("adaptive plugin registration failed: {error}"))
     })?;
+    register_pii_redaction_component().map_err(|error| {
+        CliError::Config(format!("PII redaction plugin registration failed: {error}"))
+    })?;
     let report = validate_plugin_config(config);
     if report.has_errors() {
         let messages = report