refactor: standardize level names across all roles (#195 phase 1)

Rename levels to use consistent industry-standard terminology:
- dev: medior → mid
- qa: reviewer → mid, tester → junior, add senior level
- architect: opus → senior, sonnet → junior

Add backward-compatible migration for projects.json and openclaw.json
config via level aliases in selectors and projects parser.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/roles/registry.ts

@@ -17,16 +17,16 @@ export const ROLE_REGISTRY: Record<string, RoleConfig> = {
   dev: {
     id: "dev",
     displayName: "DEV",
-    levels: ["junior", "medior", "senior"],
-    defaultLevel: "medior",
+    levels: ["junior", "mid", "senior"],
+    defaultLevel: "mid",
     models: {
       junior: "anthropic/claude-haiku-4-5",
-      medior: "anthropic/claude-sonnet-4-5",
+      mid: "anthropic/claude-sonnet-4-5",
       senior: "anthropic/claude-opus-4-5",
     },
     emoji: {
       junior: "⚡",
-      medior: "🔧",
+      mid: "🔧",
       senior: "🧠",
     },
     fallbackEmoji: "🔧",
@@ -38,15 +38,17 @@ export const ROLE_REGISTRY: Record<string, RoleConfig> = {
   qa: {
     id: "qa",
     displayName: "QA",
-    levels: ["reviewer", "tester"],
-    defaultLevel: "reviewer",
+    levels: ["junior", "mid", "senior"],
+    defaultLevel: "mid",
     models: {
-      reviewer: "anthropic/claude-sonnet-4-5",
-      tester: "anthropic/claude-haiku-4-5",
+      junior: "anthropic/claude-haiku-4-5",
+      mid: "anthropic/claude-sonnet-4-5",
+      senior: "anthropic/claude-opus-4-5",
     },
     emoji: {
-      reviewer: "🔍",
-      tester: "👀",
+      junior: "⚡",
+      mid: "🔍",
+      senior: "🧠",
     },
     fallbackEmoji: "🔍",
     completionResults: ["pass", "fail", "refine", "blocked"],
@@ -57,15 +59,15 @@ export const ROLE_REGISTRY: Record<string, RoleConfig> = {
   architect: {
     id: "architect",
     displayName: "ARCHITECT",
-    levels: ["opus", "sonnet"],
-    defaultLevel: "sonnet",
+    levels: ["junior", "senior"],
+    defaultLevel: "junior",
     models: {
-      opus: "anthropic/claude-opus-4-5",
-      sonnet: "anthropic/claude-sonnet-4-5",
+      junior: "anthropic/claude-sonnet-4-5",
+      senior: "anthropic/claude-opus-4-5",
     },
     emoji: {
-      opus: "🏗️",
-      sonnet: "📐",
+      junior: "📐",
+      senior: "🏗️",
     },
     fallbackEmoji: "🏗️",
     completionResults: ["done", "blocked"],