Billing answers account export and deletion: it holds the account grants (subscribed since Network#263, Billing#77) (#264)

ddiff --git a/server/identity/principals.js b/server/identity/principals.js
iindex 8ee992f1..1e559852 100644
---- a/server/identity/principals.js
++++ b/server/identity/principals.js
@@@ -129,9 +129,10 @@ const DEFAULT_GRANTS = [
      // and since 2026-10-09 the older services that hold personal rows (SDK 0.37.0; each subscribed before this grant).
      // Codes since 2026-10-14 (its run_tasks, plan T16; subscribed first through Network#178). Play since 2026-10-14 (its
      // scores and unlocks; subscribed at its first boot, Network#189). Space again since 2026-10-16 (its spaces, Space#59;
--    // subscribed first through Network#250).
++    // subscribed first through Network#250). Billing since 2026-10-17 (the money ledger: balances and money records;
++    // Billing#77, subscribed first through Network#263).
      ...['live', 'chat', 'community', 'media', 'games', 'actor', 'food', 'help', 'work', 'quest', 'rent', 'media-hub',
--        'deals', 'trade', 'tips', 'vip', 'watch', 'services', 'wiki', 'blog', 'bot', 'inventory', 'codes', 'play', 'space'].flatMap((svc) => [
++        'deals', 'trade', 'tips', 'vip', 'watch', 'services', 'wiki', 'blog', 'bot', 'inventory', 'codes', 'play', 'space', 'billing'].flatMap((svc) => [
          [svc, 'network.account.export.contribute', SELF_AUDIENCE, []],
          [svc, 'network.account.deletion.confirm', SELF_AUDIENCE, []],
      ]),
ddiff --git a/test/account-data.test.js b/test/account-data.test.js
iindex 542871c8..6846d10e 100644
---- a/test/account-data.test.js
++++ b/test/account-data.test.js
@@@ -93,11 +93,11 @@ const server = http.createServer(app);
  
          // ── Export ──
          const seeded = await accountData.expectedServices(db, 'network.account.export.contribute');
--        assert.deepStrictEqual(seeded, ['actor', 'blog', 'bot', 'chat', 'codes', 'community', 'deals', 'food', 'games', 'help', 'inventory', 'live', 'media', 'media-hub', 'play', 'quest', 'rent', 'services', 'space', 'tips', 'trade', 'vip', 'watch', 'wiki', 'work'],
--            'the holders of the contribute grant: the skeleton services answer too since 2026-10-08 and the older ones since 2026-10-09 (openvibe-sdk/account-data); Codes and Play since 2026-10-14 (run tasks; scores and unlocks); Space again since 2026-10-16 (its spaces)');
++        assert.deepStrictEqual(seeded, ['actor', 'billing', 'blog', 'bot', 'chat', 'codes', 'community', 'deals', 'food', 'games', 'help', 'inventory', 'live', 'media', 'media-hub', 'play', 'quest', 'rent', 'services', 'space', 'tips', 'trade', 'vip', 'watch', 'wiki', 'work'],
++            'the holders of the contribute grant: the skeleton services answer too since 2026-10-08 and the older ones since 2026-10-09 (openvibe-sdk/account-data); Codes and Play since 2026-10-14 (run tasks; scores and unlocks); Space again since 2026-10-16 (its spaces); Billing since 2026-10-17 (money records)');
          // The scenarios below follow five services; the newer ones are set aside here, exactly as an operator would
          // revoke a service's grant (the same rows, the same revoked_at).
--        for (const svc of ['actor', 'blog', 'bot', 'codes', 'deals', 'food', 'help', 'inventory', 'media-hub', 'play', 'quest', 'rent', 'services', 'space', 'tips', 'trade', 'vip', 'watch', 'wiki', 'work']) {
++        for (const svc of ['actor', 'billing', 'blog', 'bot', 'codes', 'deals', 'food', 'help', 'inventory', 'media-hub', 'play', 'quest', 'rent', 'services', 'space', 'tips', 'trade', 'vip', 'watch', 'wiki', 'work']) {
              for (const cap of ['network.account.export.contribute', 'network.account.deletion.confirm']) {
                  await db.prepare('UPDATE principal_grants SET revoked_at = ov_now() WHERE client_id = ? AND capability = ? AND revoked_at IS NULL').run(svc, cap);
              }