Send Billing usage readings under the tools manifest id

ddiff --git a/README.md b/README.md
iindex 93571fc..9cd3f53 100644
---- a/README.md
++++ b/README.md
@@@ -304,8 +304,9 @@ reload reattaches.
    `GET /api/health` shows `jobs.usage` (pending, invalid).
  - **Usage readings to OpenVibe.Billing** (`apps/_shared/billing.js`, `apps/_shared/jobs/usage.js`, plan T5 step 7):
    every job that succeeds or fails (anyone's, not only a project's; a cancelled one is not billed) gets one
--  `platform.usage-sample@1` reading — id `tools-job-<id>`, `idempotency_key` `tools:job:<id>`, service and source
--  `openvibe.tools`, operation `tools.tool.run` (a tool run) or `tools.job.create`, resource the tool or job type,
++  `platform.usage-sample@1` reading — id `tools-job-<id>`, `idempotency_key` `tools:job:<id>`, service `tools` (the
++  Contracts manifest id, so Billing keys ratings and budgets on the reading) and source `openvibe.tools`, operation
++  `tools.tool.run` (a tool run) or `tools.job.create`, resource the tool or job type,
    quantity 1, unit `jobs`, `at` the job's end, plus `project` and `trace_id` when the job has them and `subject`
    (`user:usr_…`) only for a signed-in person's job, never an app or a browser session. It is stored in
    `tool_job_billing_readings` in the transaction that records the end (no network call there); the pruner's timer
ddiff --git a/apps/_shared/jobs/usage.js b/apps/_shared/jobs/usage.js
iindex f5f32e6..330b170 100644
---- a/apps/_shared/jobs/usage.js
++++ b/apps/_shared/jobs/usage.js
@@@ -66,7 +66,7 @@ function readingOf(row) {
      const r = {
          id: `tools-job-${row.id}`,
          idempotency_key: `tools:job:${row.id}`,
--        service: 'openvibe.tools',
++        service: 'tools',   // the Contracts manifest id (services/tools.json): Billing keys ratings and budgets on it
          operation: row.tool ? 'tools.tool.run' : 'tools.job.create',
          resource: DIMENSION_RE.test(resource) ? resource : 'other',
          quantity: 1,
ddiff --git a/apps/_shared/test/job-usage.test.js b/apps/_shared/test/job-usage.test.js
iindex 4fe4991..14237d7 100644
---- a/apps/_shared/test/job-usage.test.js
++++ b/apps/_shared/test/job-usage.test.js
@@@ -214,7 +214,7 @@ function define(system) {
              for (const p of posts) {
                  const v = contracts.validate('platform.usage-sample@1', p);
                  assert.ok(v.valid, JSON.stringify(v.errors));
--                assert.deepStrictEqual([p.service, p.source, p.quantity, p.unit], ['openvibe.tools', 'openvibe.tools', 1, 'jobs']);
++                assert.deepStrictEqual([p.service, p.source, p.quantity, p.unit], ['tools', 'openvibe.tools', 1, 'jobs']);
              }
              const [person, appJob, failJob] = posts;
              assert.deepStrictEqual([person.id, person.operation, person.resource, person.subject, person.trace_id, person.project], [`tools-job-${personId}`, 'tools.tool.run', 'image-resize', `user:${USER}`, TRACE, undefined]);
ddiff --git a/docs/cutover-tools-billing-readings.md b/docs/cutover-tools-billing-readings.md
iindex 1a4da6a..7dd2d88 100644
---- a/docs/cutover-tools-billing-readings.md
++++ b/docs/cutover-tools-billing-readings.md
@@@ -51,7 +51,7 @@ release wait on the same lock and find it applied.
  - After step 5: `GET /api/health` on img, audio or docs shows `jobs.billing` with `pending` going back to 0
    after a tick (5 minutes) and `posted` growing; `refused` with a `last_error` of `token: 400 invalid_scope` means the grant is
    missing. `SELECT COUNT(*) FROM tool_job_billing_readings WHERE sent_at IS NULL` stays small.
--- In Billing: `GET /api/v1/usage?service=openvibe.tools` (`billing.ledger.admin`) lists the readings, one per
++- In Billing: `GET /api/v1/usage?service=tools` (`billing.ledger.admin`) lists the readings, one per
    ended job, `idempotency_key` `tools:job:<job id>`.
  
  ```rehearse