Add terminal package with secure ReadPassword helper

Provides echo-suppressed password prompting via golang.org/x/term for
CLI login commands. Added as a platform standard in engineering-standards.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ARCHITECTURE.md

@@ -27,7 +27,7 @@ problem, usable independently or together.
 ### Module Path
 
 ```
-git.wntrmute.dev/kyle/mcdsl
+git.wntrmute.dev/mc/mcdsl
 ```
 
 ### Dependencies
@@ -39,7 +39,7 @@ git.wntrmute.dev/kyle/mcdsl
 | `github.com/pelletier/go-toml/v2` | TOML config parsing |
 | `google.golang.org/grpc` | gRPC server |
 | `github.com/klauspost/compress/zstd` | Zstandard compression for archives |
-| `git.wntrmute.dev/kyle/mcias/clients/go` | MCIAS client library |
+| `git.wntrmute.dev/mc/mcias/clients/go` | MCIAS client library |
 
 All dependencies are already used by existing services. MCDSL adds no new
 dependencies to the platform.

CLAUDE.md

@@ -6,7 +6,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 MCDSL (Metacircular Dynamics Standard Library) is the shared Go library for the Metacircular platform. It extracts common patterns from production services into reusable, tested packages. MCDSL is not a deployed service — it is imported by other services.
 
-**Module path:** `git.wntrmute.dev/kyle/mcdsl`
+**Module path:** `git.wntrmute.dev/mc/mcdsl`
 
 ## Build Commands
 
@@ -37,6 +37,7 @@ go test ./auth/ -run TestCacheExpiry
 | `web` | Session cookies, auth middleware, template rendering for htmx UIs |
 | `health` | REST and gRPC health check handlers |
 | `archive` | tar.zst snapshots with SQLite-aware backup (VACUUM INTO) |
+| `terminal` | Secure terminal input (echo-suppressed password prompts) |
 
 ## Import Pattern
 
@@ -44,11 +45,11 @@ Services import individual packages with aliased imports:
 
 ```go
 import (
-    mcdslauth   "git.wntrmute.dev/kyle/mcdsl/auth"
-    mcdsldb     "git.wntrmute.dev/kyle/mcdsl/db"
-    mcdslconfig "git.wntrmute.dev/kyle/mcdsl/config"
-    "git.wntrmute.dev/kyle/mcdsl/httpserver"
-    "git.wntrmute.dev/kyle/mcdsl/grpcserver"
+    mcdslauth   "git.wntrmute.dev/mc/mcdsl/auth"
+    mcdsldb     "git.wntrmute.dev/mc/mcdsl/db"
+    mcdslconfig "git.wntrmute.dev/mc/mcdsl/config"
+    "git.wntrmute.dev/mc/mcdsl/httpserver"
+    "git.wntrmute.dev/mc/mcdsl/grpcserver"
 )
 ```
 
@@ -63,6 +64,7 @@ db --> (modernc.org/sqlite)
 grpcserver --> auth, config
 health --> db
 httpserver --> config
+terminal --> (golang.org/x/term)
 web --> auth, csrf
 ```
 

PROGRESS.md

@@ -91,11 +91,11 @@ Remaining mcat-specific code:
 - `web/` — templates and static assets (unchanged)
 
 Dependencies removed:
-- `git.wntrmute.dev/kyle/mcias/clients/go` (mcdsl/auth handles MCIAS directly)
+- `git.wntrmute.dev/mc/mcias/clients/go` (mcdsl/auth handles MCIAS directly)
 - `github.com/pelletier/go-toml/v2` (now indirect via mcdsl/config)
 
 Dependencies added:
-- `git.wntrmute.dev/kyle/mcdsl` (local replace directive)
+- `git.wntrmute.dev/mc/mcdsl` (local replace directive)
 
 Result: vet clean, lint 0 issues, builds successfully.
 

PROJECT_PLAN.md

@@ -10,7 +10,7 @@ code first).
 
 ## Phase 0: Project Setup
 
-- [ ] Initialize Go module (`git.wntrmute.dev/kyle/mcdsl`)
+- [ ] Initialize Go module (`git.wntrmute.dev/mc/mcdsl`)
 - [ ] Create `.golangci.yaml` (matching platform standard)
 - [ ] Create `Makefile` with standard targets (build, test, vet, lint, all)
 - [ ] Create `.gitignore`

README.md

@@ -25,7 +25,7 @@ it and provide only their service-specific logic.
 ## Module Path
 
 ```
-git.wntrmute.dev/kyle/mcdsl
+git.wntrmute.dev/mc/mcdsl
 ```
 
 ## Packages
@@ -46,10 +46,10 @@ git.wntrmute.dev/kyle/mcdsl
 
 ```go
 import (
-    "git.wntrmute.dev/kyle/mcdsl/auth"
-    "git.wntrmute.dev/kyle/mcdsl/db"
-    "git.wntrmute.dev/kyle/mcdsl/config"
-    "git.wntrmute.dev/kyle/mcdsl/httpserver"
+    "git.wntrmute.dev/mc/mcdsl/auth"
+    "git.wntrmute.dev/mc/mcdsl/db"
+    "git.wntrmute.dev/mc/mcdsl/config"
+    "git.wntrmute.dev/mc/mcdsl/httpserver"
 )
 
 // Load config with standard sections + service-specific fields.

archive/archive.go

@@ -20,7 +20,7 @@ import (
 
 	"github.com/klauspost/compress/zstd"
 
-	"git.wntrmute.dev/kyle/mcdsl/db"
+	"git.wntrmute.dev/mc/mcdsl/db"
 )
 
 // defaultExcludePatterns are always excluded from snapshots.

archive/archive_test.go

@@ -7,7 +7,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"git.wntrmute.dev/kyle/mcdsl/db"
+	"git.wntrmute.dev/mc/mcdsl/db"
 )
 
 // setupServiceDir creates a realistic /srv/<service>/ directory.

config/config.go

@@ -34,7 +34,7 @@ import (
 
 	"github.com/pelletier/go-toml/v2"
 
-	"git.wntrmute.dev/kyle/mcdsl/auth"
+	"git.wntrmute.dev/mc/mcdsl/auth"
 )
 
 // Base contains the configuration sections common to all Metacircular

go.mod

@@ -1,4 +1,4 @@
-module git.wntrmute.dev/kyle/mcdsl
+module git.wntrmute.dev/mc/mcdsl
 
 go 1.25.7
 
@@ -18,6 +18,7 @@ require (
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	golang.org/x/net v0.48.0 // indirect
 	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/term v0.41.0 // indirect
 	golang.org/x/text v0.32.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect

go.sum

@@ -49,6 +49,8 @@ golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
 golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/term v0.41.0 h1:QCgPso/Q3RTJx2Th4bDLqML4W6iJiaXFq2/ftQF13YU=
+golang.org/x/term v0.41.0/go.mod h1:3pfBgksrReYfZ5lvYM0kSO0LIkAl4Yl2bXOkKP7Ec2A=
 golang.org/x/text v0.32.0 h1:ZD01bjUt1FQ9WJ0ClOL5vxgxOI/sVCNgX1YtKwcY0mU=
 golang.org/x/text v0.32.0/go.mod h1:o/rUWzghvpD5TXrTIBuJU77MTaN0ljMWE47kxGJQ7jY=
 golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=

grpcserver/server.go

@@ -21,7 +21,7 @@ import (
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 
-	"git.wntrmute.dev/kyle/mcdsl/auth"
+	"git.wntrmute.dev/mc/mcdsl/auth"
 )
 
 // MethodMap classifies gRPC methods for access control.

grpcserver/server_test.go

@@ -13,7 +13,7 @@ import (
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 
-	"git.wntrmute.dev/kyle/mcdsl/auth"
+	"git.wntrmute.dev/mc/mcdsl/auth"
 )
 
 func mockMCIAS(t *testing.T) *httptest.Server {

health/health_test.go

@@ -10,7 +10,7 @@ import (
 
 	"google.golang.org/grpc"
 
-	"git.wntrmute.dev/kyle/mcdsl/db"
+	"git.wntrmute.dev/mc/mcdsl/db"
 )
 
 func TestHandlerHealthy(t *testing.T) {

httpserver/server.go

@@ -13,7 +13,7 @@ import (
 
 	"github.com/go-chi/chi/v5"
 
-	"git.wntrmute.dev/kyle/mcdsl/config"
+	"git.wntrmute.dev/mc/mcdsl/config"
 )
 
 // Server wraps a chi router and an http.Server with the standard

httpserver/server_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	"git.wntrmute.dev/kyle/mcdsl/config"
+	"git.wntrmute.dev/mc/mcdsl/config"
 )
 
 func testConfig() config.ServerConfig {

terminal/terminal.go

@@ -0,0 +1,22 @@
+// Package terminal provides secure terminal input helpers for CLI tools.
+package terminal
+
+import (
+	"fmt"
+	"os"
+
+	"golang.org/x/term"
+)
+
+// ReadPassword prints the given prompt to stderr and reads a password
+// from the terminal with echo disabled. It prints a newline after the
+// input is complete so the cursor advances normally.
+func ReadPassword(prompt string) (string, error) {
+	fmt.Fprint(os.Stderr, prompt)
+	b, err := term.ReadPassword(int(os.Stdin.Fd())) //nolint:gosec // fd fits in int
+	fmt.Fprintln(os.Stderr)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}

terminal/terminal_test.go

@@ -0,0 +1,14 @@
+package terminal
+
+import (
+	"testing"
+)
+
+func TestReadPasswordNotATTY(t *testing.T) {
+	// When stdin is not a terminal (e.g. in CI), ReadPassword should
+	// return an error rather than hanging or panicking.
+	_, err := ReadPassword("Password: ")
+	if err == nil {
+		t.Fatal("expected error when stdin is not a terminal")
+	}
+}

web/web.go

@@ -8,7 +8,7 @@ import (
 	"io/fs"
 	"net/http"
 
-	"git.wntrmute.dev/kyle/mcdsl/auth"
+	"git.wntrmute.dev/mc/mcdsl/auth"
 )
 
 // SetSessionCookie sets a session cookie with the standard Metacircular

web/web_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"testing/fstest"
 
-	"git.wntrmute.dev/kyle/mcdsl/auth"
+	"git.wntrmute.dev/mc/mcdsl/auth"
 )
 
 func TestSetSessionCookie(t *testing.T) {