feat(web): move Hire Us pricing to $400/hour metered billing (PRD 0002) (#102)

* feat(web): move Hire Us pricing to $400/hour metered billing (PRD 0002)

Replaces the $250/week retainer with a $400/hour rate billed against actual
hours, invoiced through CoinPay after the client approves them. A 10-hour
minimum engagement replaces the week as the unit of commitment.

The weekly price lived in 12 places, not the 3 the PRD listed: the front-page
Hire Us section, the Top-Level Pages list, /hire-us metadata, /pricing
(metadata, two FAQ answers, rate bullet), /about, llms.txt, skill.md, and the
Hire Us form success message.

Metered billing rather than a committed weekly block, because the old
"recurring CoinPay invoice" copy documented a mechanic that never existed:
/api/payments/create makes a single one-shot payment, not a subscription.

- coinpay-checkout derives amount_usd from hours x 400 instead of a hardcoded
  250, validates hours as quarter-hour increments at or above the minimum, and
  returns 422 before calling CoinPay on bad input. Payment metadata carries
  billing/hours/rate_usd_per_hour in place of interval.
- project-request returns a rate, billing mode, and minimum; no amount exists
  until hours are approved.
- CoinPay config block documents COINPAY_RATE_USD_PER_HOUR / COINPAY_BILLING /
  COINPAY_MINIMUM_HOURS instead of a weekly amount and interval.
- New real /terms route replacing the SPA stub: what is billable, the
  approve-then-invoice flow, the minimum, cancellation on one week's notice,
  and an explicit clause that existing engagements keep their terms until both
  sides agree in writing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix(mcp): advance prd_next_id expectation to 0003 for PRD 0002

The standards test asserts prd_next_id against the live prd/ directory, so
adding prd/0002-hourly-hire-us-rate.md moves the next free id to 0003. This
assertion advances with every PRD added to the repo.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/logicsrc-web/src/app/[[...slug]]/page.tsx

@@ -8,8 +8,9 @@ import { HomeInteractivity } from "@/components/home-interactivity";
 // scrolled to the matching section. We preserve those URLs (they are canonical
 // in sitemap.xml) by rendering the same page for each known route and 404ing
 // anything else.
-// /about and /docs are now real routes (app/about, app/docs); the rest still
-// render the homepage SPA scrolled to their section.
+// /about, /docs, /pricing, and /terms are now real routes (app/about, app/docs,
+// app/pricing, app/terms); the rest still render the homepage SPA scrolled to
+// their section.
 const ROUTE_META: Record<string, { title: string; description: string }> = {
   openspec: {
     title: "LogicSRC vs OpenSpec.dev · LogicSRC",
@@ -21,9 +22,8 @@ const ROUTE_META: Record<string, { title: string; description: string }> = {
   },
   "hire-us": {
     title: "Hire Us · LogicSRC",
-    description: "Implementation help for LogicSRC, AgentSwarm, and Credential Sharing at $250/week for accepted work, paid via CoinPay.",
+    description: "Implementation help for LogicSRC, AgentSwarm, and Credential Sharing at $400/hour for accepted work, paid via CoinPay.",
   },
-  terms: { title: "Terms · LogicSRC", description: "LogicSRC terms of use." },
   privacy: { title: "Privacy · LogicSRC", description: "LogicSRC privacy notes." },
   "agent-swarm": {
     title: "AgentSwarm · LogicSRC",