feat(ui): call lanes "workspaces" in the UI, CLI output and docs

Copy-only rename (workspace redesign, phase 0). The word a user reads
changes — "Lane" → "Workspace", "Add lane" → "Add workspace" — in both
locales, in agenthub CLI prose and help, in the server's error messages
and in the docs. Every identifier stays: /api/lanes, `agenthub lanes`,
--lane, AGENTHUB_LANE_ID, error codes, tmux names, DB tables, file,
component and i18n key names. docs/LANES.md keeps its name, retitled
"Workspaces (lanes)".

client/src/i18n/locales/en/settings.json

@@ -68,7 +68,7 @@
     "title": "CLAUDE_HOME",
     "description": "Root directory for Claude Code session data. Changing this updates the scan path for transcripts and imports immediately.",
     "placeholder": "/path/to/claude-home",
-    "routersMissing": "Saved. These lanes name an AI Router profile the new home does not have, and start on Native until it is added there or they are re-pointed: {{lanes}}"
+    "routersMissing": "Saved. These workspaces name an AI Router profile the new home does not have, and start on Native until it is added there or they are re-pointed: {{lanes}}"
   },
   "hooks": {
     "title": "Hook Configuration",
@@ -80,8 +80,8 @@
     "failed": "Hook installation failed"
   },
   "lanesSection": {
-    "title": "Lanes",
-    "description": "Machine-wide lane housekeeping.",
+    "title": "Workspaces",
+    "description": "Machine-wide workspace housekeeping.",
     "runHousekeeping": "Run housekeeping",
     "dryRun": "Dry run",
     "gcResult": "Reaped {{reaped}} process(es), capped {{capped}} log(s)"
@@ -474,7 +474,7 @@
   },
   "aiRouter": {
     "title": "AI Router",
-    "description": "Endpoints that stand in front of Claude Code and Codex — 9Router, OpenRouter, a self-hosted gateway. Save one here, then pick it when you create a lane.",
+    "description": "Endpoints that stand in front of Claude Code and Codex — 9Router, OpenRouter, a self-hosted gateway. Save one here, then pick it when you create a workspace.",
     "add": "Add profile",
     "edit": "Edit",
     "remove": "Remove",
@@ -487,7 +487,7 @@
     "keySet": "Saved",
     "keyMissing": "None",
     "fieldLabel": "Name",
-    "fieldLabelHint": "What you will see in the lane form. Free text.",
+    "fieldLabelHint": "What you will see in the workspace form. Free text.",
     "fieldBaseUrl": "Base URL",
     "fieldBaseUrlHint": "The router's OpenAI/Anthropic-compatible endpoint, e.g. http://localhost:20128/v1",
     "fieldApiKey": "API key",
@@ -506,9 +506,9 @@
     },
     "save": "Save",
     "cancel": "Cancel",
-    "removeConfirm": "Remove the profile \"{{label}}\"? Every lane using it is reset to the vendor's own API right away — on disk and in the dashboard.",
+    "removeConfirm": "Remove the profile \"{{label}}\"? Every workspace using it is reset to the vendor's own API right away — on disk and in the dashboard.",
     "loading": "Loading profiles…",
-    "lanesFailed": "Saved, but {{count}} lane could not be updated and still carries the old endpoint: {{lanes}}",
+    "lanesFailed": "Saved, but {{count}} workspace could not be updated and still carries the old endpoint: {{lanes}}",
     "test": "Test",
     "testing": "Testing…",
     "testOk": "The endpoint answered — {{model}} is reachable with this key.",
@@ -516,7 +516,7 @@
   },
   "aiTools": {
     "title": "AI Tools",
-    "description": "AI coding CLIs AgentHub can run in a lane. Detected on this machine's PATH; a disabled tool is hidden from Add lane.",
+    "description": "AI coding CLIs AgentHub can run in a workspace. Detected on this machine's PATH; a disabled tool is hidden from Add workspace.",
     "installed": "Installed ({{count}} detected)",
     "available": "Available to install ({{count}})",
     "refresh": "Refresh",
@@ -585,14 +585,14 @@
   },
   "codexHome": {
     "title": "CODEX_HOME",
-    "description": "Root directory for Codex config and session journals. The dashboard reads it, writes AI Router layers into it, and starts every codex lane with it.",
-    "restartNote": "A codex lane already running keeps the home it started with, and shows as idle, until it is restarted.",
+    "description": "Root directory for Codex config and session journals. The dashboard reads it, writes AI Router layers into it, and starts every codex workspace with it.",
+    "restartNote": "A codex workspace already running keeps the home it started with, and shows as idle, until it is restarted.",
     "placeholder": "/path/to/codex-home",
     "routersFailed": "Saved, but the AI Router layer could not be re-written for: {{lanes}}"
   },
   "codexHooks": {
     "title": "Codex hooks",
-    "description": "Let Codex report to AgentHub as it works: each tool call in the session's timeline, \"Codex needs your permission\" on the lane card and as a notification, and running/idle the moment a turn starts or ends. Tokens and cost come from Codex's journals either way.",
+    "description": "Let Codex report to AgentHub as it works: each tool call in the session's timeline, \"Codex needs your permission\" on the workspace card and as a notification, and running/idle the moment a turn starts or ends. Tokens and cost come from Codex's journals either way.",
     "notInstalled": "Not installed",
     "untrusted": "Installed — waiting for your trust in Codex",
     "trusted": "Installed and trusted",
@@ -614,7 +614,7 @@
     "notInstalled": "Not installed",
     "installed": "Installed",
     "disabled": "Installed but switched off in hooks.json",
-    "note": "agy loads hooks at its next start and asks for no trust. The file is global, so the Antigravity IDE runs the hook too; AgentHub ignores what the IDE sends. agy has no hook for a permission prompt, so an Antigravity lane cannot show \"needs your permission\".",
+    "note": "agy loads hooks at its next start and asks for no trust. The file is global, so the Antigravity IDE runs the hook too; AgentHub ignores what the IDE sends. agy has no hook for a permission prompt, so an Antigravity workspace cannot show \"needs your permission\".",
     "install": "Install",
     "reinstall": "Reinstall",
     "refresh": "Refresh",
@@ -629,9 +629,9 @@
     "update": "Update…",
     "usage_one": "{{count}} session · ${{cost}}",
     "usage_other": "{{count}} sessions · ${{cost}}",
-    "lanes": "Lanes:",
+    "lanes": "Workspaces:",
     "defaultModel": "Default model",
-    "defaultModelHint": "The model a new run in this tool's lanes starts on. The run form can still pick another one.",
+    "defaultModelHint": "The model a new run in this tool's workspaces starts on. The run form can still pick another one.",
     "saveDefaultModel": "Save default model",
     "config": "Config files",
     "configHint": "This tool's own settings files. A save is checked for valid syntax, the old text is backed up in AgentHub's data folder, and nothing is saved if the file changed since you opened it.",