feat: surface repo root in runtime prompt

src/config/schema.ts

@@ -197,6 +197,7 @@ const FIELD_LABELS: Record<string, string> = {
   "skills.load.watch": "Watch Skills",
   "skills.load.watchDebounceMs": "Skills Watch Debounce (ms)",
   "agents.defaults.workspace": "Workspace",
+  "agents.defaults.repoRoot": "Repo Root",
   "agents.defaults.bootstrapMaxChars": "Bootstrap Max Chars",
   "agents.defaults.envelopeTimezone": "Envelope Timezone",
   "agents.defaults.envelopeTimestamp": "Envelope Timestamp",
@@ -432,6 +433,8 @@ const FIELD_HELP: Record<string, string> = {
   "auth.cooldowns.failureWindowHours": "Failure window (hours) for backoff counters (default: 24).",
   "agents.defaults.bootstrapMaxChars":
     "Max characters of each workspace bootstrap file injected into the system prompt before truncation (default: 20000).",
+  "agents.defaults.repoRoot":
+    "Optional repository root shown in the system prompt runtime line (overrides auto-detect).",
   "agents.defaults.envelopeTimezone":
     'Timezone for message envelopes ("utc", "local", "user", or an IANA timezone string).',
   "agents.defaults.envelopeTimestamp":

src/config/types.agent-defaults.ts

@@ -99,6 +99,8 @@ export type AgentDefaultsConfig = {
   models?: Record<string, AgentModelEntryConfig>;
   /** Agent working directory (preferred). Used as the default cwd for agent runs. */
   workspace?: string;
+  /** Optional repository root for system prompt runtime line (overrides auto-detect). */
+  repoRoot?: string;
   /** Skip bootstrap (BOOTSTRAP.md creation, etc.) for pre-configured deployments. */
   skipBootstrap?: boolean;
   /** Max chars for injected bootstrap files before truncation (default: 20000). */

src/config/zod-schema.agent-defaults.ts

@@ -42,6 +42,7 @@ export const AgentDefaultsSchema = z
       )
       .optional(),
     workspace: z.string().optional(),
+    repoRoot: z.string().optional(),
     skipBootstrap: z.boolean().optional(),
     bootstrapMaxChars: z.number().int().positive().optional(),
     userTimezone: z.string().optional(),