fix(persistence): reconcile project session layout

packages/session-persistence/session-persistence-jsonl/src/index.ts

@@ -40,9 +40,9 @@ export interface Config {
   /**
    * Root directory for all session files. Required (no default): a default of
    * `process.cwd()` would scatter session files as the process's cwd changes
-   * (bash calls, subprocesses). Sessions group under per-cwd subdirectories. An
-   * existing root must be a readable directory; an absent root is created on
-   * first materialization.
+   * (bash calls, subprocesses). Sessions group under human-readable project
+   * directories, then per-session directories. An existing root must be a
+   * readable directory; an absent root is created on first materialization.
    */
   root: string
   /**

packages/session-persistence/session-persistence/tests/coordinator-contract.ts

@@ -683,7 +683,7 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
       const fix = await makeFixture()
       const { ctx, fiber } = await freshCtx(fix)
       try {
-        // Ownerless state created WITHOUT a cwd (the no-cwd bucket).
+        // Ownerless state created WITHOUT a cwd (the `_no-cwd` project directory).
         await ctx.sessionPersistence.create(meta('no-cwd-state'))
         // A live session reusing the id but WITH cwd WORK is a cwd mismatch
         // (undefined vs WORK) and must be rejected.