feat(import): label imported sessions with a human summary

CHANGELOG.md

@@ -18,6 +18,9 @@ All notable changes to **basou** are recorded here. The project follows
   action are skipped. Imports reuse the existing `session import` pipeline,
   so path sanitization and id minting are unchanged. Re-running an import is
   idempotent: a transcript already imported is skipped rather than duplicated.
+  Imported sessions are labelled with a human summary
+  (`claude-code <date>: <n> commands, <m> files`) instead of the raw session
+  id, so they read as content in `basou session list` and the handoff.
 - `claude-code-import` session `source.kind` (additive enum value) to
   distinguish transcript-derived sessions from live `claude-code-adapter`
   runs and Basou-format `import`s.

packages/core/src/adapters/claude-code/transcript-importer.test.ts

@@ -71,6 +71,8 @@ describe("claudeTranscriptToImportPayload", () => {
     expect(payload.session.related_files).toEqual([`${CWD}/a.ts`, `${CWD}/b.ts`]);
     // The transcript's own sessionId becomes the source external_id (dedup key).
     expect(payload.session.source.external_id).toBe("abc-123");
+    // The label is a human-readable summary (date + counts), not an opaque id.
+    expect(payload.session.label).toBe("claude-code 2026-05-10: 1 command, 2 files");
 
     const types = payload.events.map((e) => e.type);
     expect(types).toEqual([
@@ -177,7 +179,9 @@ describe("claudeTranscriptToImportPayload", () => {
     expect(payload).not.toBeNull();
     if (payload === null) return;
     expect(payload.session.source.external_id).toBe("from-option");
-    expect(payload.session.label).toContain("from-option");
+    // The id lives in source.external_id; the label is a content summary, not the id.
+    expect(payload.session.label).not.toContain("from-option");
+    expect(payload.session.label).toMatch(/^claude-code \d{4}-\d{2}-\d{2}: \d+ command/);
   });
 
   it("returns null when no observable command / file action exists", () => {

packages/core/src/adapters/claude-code/transcript-importer.ts

@@ -124,8 +124,15 @@ export function claudeTranscriptToImportPayload(
   ];
 
   const externalId = options.externalId ?? claudeSessionId;
-  const label =
-    externalId !== undefined ? `claude-code import ${externalId}` : "claude-code import";
+  // Human-readable label: when + how much, so the session reads as content in
+  // `basou session list` / handoff rather than an opaque id. The source id is
+  // kept structurally in `source.external_id` (not the label), and paths are
+  // deliberately excluded — the label is NOT path-sanitized downstream, so a
+  // raw file path here would leak an operator-private prefix.
+  const commandCount = derived.reduce((n, e) => (e.type === "command_executed" ? n + 1 : n), 0);
+  const fileCount = relatedFiles.size;
+  const date = minTs.slice(0, 10);
+  const label = `claude-code ${date}: ${commandCount} ${commandCount === 1 ? "command" : "commands"}, ${fileCount} ${fileCount === 1 ? "file" : "files"}`;
 
   const payload: SessionImportPayload = {
     schema_version: "0.1.0",