feat(tracker): add alpha calibration and dynamic pricing

Add TOPLOC honest-noise calibration storage/dispatch and validator divergence reporting for AH-021.

Add opt-in HuggingFace marketplace pricing refresh, price-change history, CLI flags, and AH-023 tracking docs.

Verification: .venv/bin/python -m pytest tests/ -q -k 'not integration' => 346 passed, 2 skipped, 1 deselected; compileall packages tests passed; focused AH-021/AH-023 tests 32 passed.

.scratch/alpha-hardening/README.md

@@ -1,6 +1,11 @@
 # Alpha hardening — planning index
 
-Pre-release alpha audit + grilling (2026-07-04). **Research complete; planning complete; Bucket 1 blockers next.**
+Pre-release alpha audit + grilling (2026-07-04). Bucket 1 trust-boundary blockers + fraud arc: **done** (16/22 original issues). Bucket 2 (12-15, multi-tracker) and 17 (doc dedup) remain deferred/human-gated — not launch blockers.
+
+**Launch-readiness grilling (2026-07-06):** locked plan is devnet dev/test run now, then real mainnet SOL/USDT for the first cohort — friends (API clients) + hired VPS/VPC hosts (own test infra, not third-party volunteers, stake-free). No new public token; TAI stays dormant per ADR-0002's existing volume/legal gates. Two new issues came out of this session:
+
+- **[21 — Honest-noise calibration corpus](./issues/21-honest-noise-calibration-corpus.md)** — rescoped from "prod gate" to a hard **alpha-release blocker**. `Status: ready-for-human` — engineering (audit.py raw divergence, tracker dispatch endpoint, SQLite corpus, p99 envelope) done 2026-07-06; blocked on a human running the calibration job against the real hired-VPS fleet before launch.
+- **[23 — Dynamic HF-benchmarked pricing](./issues/23-dynamic-hf-pricing.md)** — new, high priority but not a release blocker. `Status: done` — engineering complete 2026-07-06 (hf_pricing.py, opt-in daily refresh loop, GET /v1/pricing/hf/history); real `hf_aliases` curation per model is a follow-up human sign-off, not a completion blocker.
 
 Locked scope: one settlement tracker, open node join, devnet mock-USDT, reputation carries forward → fraud must be bounded. See [ADR-0016](../../docs/adr/0016-alpha-scope-and-known-limitations.md).