feat(license): metered licensing — catalogue, entitlements, and enforcement

Implements spec 7 tasks 2-10 on top of the six-plan payload from task 1.

Admin: plans re-keyed on (deployment, tier); new catalogue collection holds
every Paddle price ID (one row per priceable component); new entitlements
collection holds desired beside granted. admin/internal/catalogue owns both
folds — entitlement to licence limits, and entitlement to Paddle line items —
so the base allowance is subtracted in exactly one place. licensing.Issue now
snapshots the instance's granted entitlement, never desired. Free is enforced
per account AND deployment. Staff endpoints for plans, catalogue and
entitlements; Free self-hosted can be claimed and renewed on its annual term;
the reaper stays cloud-only.

Server: enforces the monitor cap, audit-log retention (daily sweep, skips
Unlimited and lapsed instances), and gates the OIDC callback. Unset limits are
filled from the seed plan at the single decode site so old blobs never read as
zero.

Frontends: adminsite gains a catalogue price-ID editor, six-plan allowance
screen, and a catalogue-driven PlanConfigurator mounted on the staff instance
page. web shows monitors, audit retention and support level on the licence page.

Docs: CLAUDE.md, spec index and plan 5 preamble updated.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/superpowers/specs/README.md

@@ -12,7 +12,7 @@ Build in this order. Specs 0a–5 were designed 2026-07-24; spec 6 on 2026-07-26
 | 4 | [admin-site](2026-07-24-admin-site-design.md) | — | ready to start |
 | 5 | [paddle-billing](2026-07-24-paddle-billing-design.md) | [plan](../plans/2026-07-26-paddle-billing.md) | ready to start, **but revised by 7** — its "signup migration off sitesvc" section is superseded by 6, and its single-price-per-subscription assumption by 7 |
 | 6 | [cloud-instance-creation](2026-07-26-cloud-instance-creation-design.md) | — | ready to start |
-| 7 | [metered-licensing](2026-07-26-metered-licensing-design.md) | — | designed; **build before 5**, whose plan it revises |
+| 7 | [metered-licensing](2026-07-26-metered-licensing-design.md) | [plan](../plans/2026-07-26-metered-licensing.md) | **shipped** — staff can configure and issue any of the six plans; no customer can buy one until 5 lands |
 
 Specs 1 and 2 together give working licensing with licences cut by hand with
 `lkctl` — no admin service needed. 4 and 5 can run in parallel once 3 lands.