Record verified Prime Intellect API facts, and log a real pricing bug

The token was found on cloud-1 after all, in a Claude memory note. Verifying its
claims against the live API turned up a defect in code already shipped.

**prices.onDemand is the total for the whole node, not per-GPU.** Confirmed:
datacrunch lists 1x A100 at 1.79 and 2x A100 at 3.58, and gpuMemory scales the
same way (640 for 8x 80GB). packages/prime/src/map.ts stores both as if they
were per-GPU, so an 8-GPU node reads eight times too expensive. It would have
silently poisoned inventory search, the max-price filter and every margin
comparison against bought capacity — and nobody would have noticed, because the
numbers still look plausible. Logged rather than fixed, per the instruction to
hold; it needs a regression test built from the real 1x/2x pair.

**Inference is a different host.** api.primeintellect.ai is compute and pods;
inference is api.pinference.ai/api/v1, OpenAI-compatible. PIG's config knows
only the first, so A4 and A13 need both.

**Piggy's default model** is nvidia/nemotron-3-nano-30b-a3b, and the important
detail is that it is a hybrid reasoning model which thinks aloud by default and
truncates under a tight max_tokens. `reasoning_effort: "none"` gives ~1s terse
output for tool use and extraction, which is what Piggy does nearly all of the
time.

One claim did NOT reproduce: the note warns of Cloudflare 403ing non-browser
user-agents, but PIG's own UA and curl's both returned 200. Recorded as history
in case a 403 ever appears.

Also logged: the key is a broad, never-expiring credential sitting in plaintext
in a memory markdown file. PIG's sync should hold a separate narrower key
scoped to availability reads.

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

docs/build-plan.md

@@ -146,14 +146,43 @@ carry real data than after.
 
 ---
 
+## Prime Intellect API — verified facts
+
+Confirmed against the live API, not assumed. These change how A4, A13 and the
+inventory sync must be built.
+
+**Two different hosts.** `api.primeintellect.ai` is the compute/pods API
+(availability, pods, billing). Inference is `api.pinference.ai/api/v1`, which
+is OpenAI-compatible (`/chat/completions`, `/models`, and an Anthropic-style
+`/messages`). PIG's config needs both, separately — `PRIME_API_BASE` today
+points only at the first.
+
+**⚠️ `prices.onDemand` is the TOTAL FOR THE NODE, not per-GPU.** Verified:
+datacrunch lists 1× A100 at 1.79 and 2× A100 at 3.58. `gpuMemory` is likewise
+a node total (640 for 8× 80GB). The current mapper stores both as if per-GPU,
+so an 8-GPU node reads eight times too expensive — see the logged bug. Divide
+by `gpuCount` at the boundary and keep the node total alongside it.
+
+**Piggy's default model:** `nvidia/nemotron-3-nano-30b-a3b` ($0.05/$0.20 per
+Mtok). It is a *hybrid reasoning* model that thinks aloud by default and will
+ramble or truncate under a tight `max_tokens`. Pass **`reasoning_effort:
+"none"`** for tool use, routing, extraction and classification — roughly one
+second, terse output. Leave reasoning on only for genuine math or logic, where
+it arrives in a separate `reasoning_content` field while `content` stays clean.
+
+**Billing** is pay-as-you-go against a shared balance, not a per-model
+whitelist. Check with `GET /api/v1/billing/wallet`.
+
+**The user-agent concern did not reproduce** — both a browser UA and PIG's own
+returned 200. Worth remembering it was once an issue if a 403 ever appears.
+
 ## Open questions
 
-- **Where is the Prime Intellect API token?** Searched cloud-1's `~/.prime`,
-  `~/.config/prime`, `/opt` and `/etc` and found nothing. Needed for A13 (model
-  selection against PI inference) and to switch inventory sync on. Scope it to
-  `Availability → Read` for sync; model access needs its own key.
-- **Which Nemotron model** should Piggy default to, and is it served from PI
-  inference or from your own spark-1 box? The adapter should treat the endpoint
-  as configuration either way.
+- **Which inference host for on-prem?** Piggy's endpoint must be configuration,
+  since a customer deployment should reach their own inference rather than
+  Prime Intellect's. The model *name* should be admin-selectable (A13); the
+  *host* belongs in environment configuration.
 - **Who may import?** Suggested default: team leads and platform admins only,
   never a plain member. Easy to loosen, unpleasant to tighten after the fact.
+- **Which key does PIG get?** The existing key is broad and never expires. PIG's
+  sync should hold a separate, narrower one — see the logged task.