Add planet environment-extra materials to capex calcs; buildcost.py tool

Every building needs a planet-hazard material bundle on top of its normal
BuildingCosts (SEA for low pressure, HSE for high pressure, MGC for low
gravity, BL for high gravity, INS for cold, TSH for heat - area-scaled
where applicable), confirmed against live in-game build panels on Nike.
FIO's own BuildRequirements field is an unreliable superset across hazard
types, not a direct per-building list - don't use it directly.

- puga/planet.py::environment_extras(): the real threshold table.
- tools/buildcost.py: full construction material list for one building,
  optionally on a given planet.
- Wired into whatif.py/buy.py (via simulate(planet=...)) and scan.py's
  own bcost(), so their capex numbers stop silently omitting this.
- docs/mechanics.md: the rule, plus a separate forum-sourced note on the
  CX order-cancellation penalty.

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

CLAUDE.md

@@ -57,7 +57,24 @@ Run as `puga <tool> ...` (e.g. `puga scan --min-n 3`, `puga plan pull <uuid>`);
 - `tools/shiptrip.py SHIP FROM TO [--v0 X --v1 Y]` the simple ship-trip tool: give a ship registration + start + stop, it works out jumps/charges/landing fuel itself via `tools/route.py`'s jump graph and reports fuel cost (defaults to max sliders). Direct-jump routes only - an unconnected pair means gateway-only, and it tells you exactly what to read off the live APEX Ship Flight Control screen (the LOCK fee - genuinely not available via FIO/PRUNplanner, confirmed by inspecting both) and what to run instead (`tools/shipcost.py`). Warns if the given ship's live specs (FIO `/ship/ships/{user}`) don't match the calibrated hull/reactor.
 - `tools/shipcost.py [--jumps N --charges N] [--v0 X --v1 Y] [--gateways N --lock-fee AMOUNT:CURRENCY] [--to PLANET]` the explicit/manual version: fuel/AIC cost of a ship trip from physics parameters you already know (jump count, slider values, gateway LOCK fees read off the live game) - use `tools/shiptrip.py` instead if you just want "ship X from A to B". Landing fuel is a measured-planet lookup via `--to`, independent of whether the route used jumps or gateways. Both tools scoped to this account's one hull/reactor (blueprint BP-STRT-0000, shared by both ships AVI-07JFB/AVI-07JFC); open caveats (v0 relative to current fuel load, landing fuel confounded with gravity/distance, no second hull to cross-check) are in `puga/shipping.py`'s module docstring - don't trust magnitudes beyond what's there. Raw calibration data (APEX DOM reads, 2026-10-09): `empire/data/shipping_calibration/`. Also wired into `tools/network.py`'s freight cost (direct-jump transfers use the real model; gateway transfers need an explicit `trip_cost` in the chain YAML, else a 9250 AIC fallback). Library: `puga/shipping.py` (`trip_fuel()`, `round_trip_cost()`).
 - `tools/parkcash.py [--min-spread X] [--min-trade-days N] [--rate R] [--top N]` where to park idle cash as a buy-low/sell-high position (not a build) while ships are busy or cash has no better use right now - scans every ticker for a big bid/ask spread AND real trading liquidity (trade-days/gap over a calendar window - a huge spread with few trading days is a stale-quote trap, confirmed by hand: AST showed a 130% spread but its resting ask had gone stale after a 60% real price crash). Round-trip wait/value is EMPIRICAL (`puga.history.empirical_touch`, same model as `tools/sell.py --tiers`), not an assumed random walk - a driftless-walk version was tried and backtested wrong (overstated reachability 2-4x vs 3 years of real data, see `docs/decisions.md`). This dropped the whole universe's top pick from ~94%/day to ~1%/day with real waits of 19-194+ days - treat any number from the old model as stale. `--rate` defaults to 0.0 (matches the idle-cash premise; pass your realized growth rate if this cash IS earmarked) and shows up as a separate `discounted_pct` column (margin% x real odds both legs ever happen) alongside the simple non-compounding `daily_pct` used for ranking. Library: `puga/parkcash.py`.
+- `tools/contd.py [--cx AI1]` evaluates this account's OPEN CONTD contract offers (the NPC logistics-officer
+  pool in APEX's CONTD panel, usually 3 at a time, only one acceptable) - payment, each required
+  material priced at real buy-fresh cost, and net. Deliberately leaves conditions it can't price
+  (EXPLORATION, REPAIR_SHIP, HEADQUARTERS_UPGRADE, BASE_CONSTRUCTION, CONTRIBUTION, WAIT,
+  INCREASE_SATISFACTION - real cost depends on context the API can't see, e.g. a ship already flying
+  that route) as flagged, unpriced conditions, and doesn't account for materials you may already hold
+  in storage - it's a breakdown for the caller to judge, not a verdict. Library: `puga/contd.py`.
 - `tools/lmscan.py PLANET [--direction source|destination] [--min-margin X]` live Local Market hauling-ad scan (FIO, public/no-auth - real player-posted freight jobs, not the CONTD player-contract system), ranked by margin after real fuel cost (`puga.shipping.leg_cost`). One-way cost only - margin assumes the next job is picked up near the destination, not an empty flight home. A small measured gateway-fee table covers ANT<->HRT/BEN; other gateway routes can't be priced (LOCK fee isn't available via any API). Library: `puga/contracts.py`.
+- `tools/buildcost.py BUILDING [--planet ID] [--amount N] [--cx AI1]` full construction material
+  list for one building, priced at real fill cost; `--planet` adds that planet's environment-extra
+  materials (SEA/HSE/MGC/BL/INS/TSH - threshold table in `docs/mechanics.md`). Also wired into
+  `whatif.py`/`buy.py`/`scan.py`'s own capex numbers via `simulate(planet=...)` / `scan.py`'s
+  `bcost()`. Library: `puga/planet.py::environment_extras()`.
+- `tools/actpkg.py NAME TICKER:QTY [TICKER:QTY ...] [--cx AI1] [-o file.json]` emits a Refined PrUn
+  (browser extension, github.com/refined-prun/refined-prun) `XIT ACT` action-package JSON for a buy
+  list - paste into the extension's Import Action Package to pre-fill the in-game CXPO buy tile per
+  material (player still clicks the real buy button - semi-auto, not full auto). NAME must be
+  letters/digits/spaces only; punctuation is stripped automatically. Library: `puga/actpkg.py`.
 - `tools/price.py` prices across exchanges with VWAP, volume, fill price for a quantity; `tools/book.py` order-book ladder.
 - `tools/prun_scan.py`, `tools/prun_cxarb.py` legacy top-of-book scans; overstate thin markets. Baseline only. `tools/arb.py` replacement is on the roadmap.
 - `puga/econ.py` pure formulas ported from PRUNplanner (efficiency stack, workforce, extraction, production I/O, hab optimizer); `tests/test_econ.py` holds the reference values.