fix!(lua.endpoints): skip-opened tag packs are a dead zone — no-op picks, missing dealt hand, hangs that break the session

[Khetnen]

Description

Packs opened from skip tags at BLIND_SELECT misbehave over RPC in three ways.
All three are fine in the vanilla UI; all three were reproduced with a
differential harness replaying identical traces on a vanilla-faithful simulator.

1. Silent no-op pick. pack returned success for a pick from a skip-opened
   Celestial pack, but nothing happened on live: the pack still had all its
   cards, the planet was unused, no hand was leveled (seed LS5HXL62, step 28).
2. No dealt hand for Arcana/Spectral tag packs. Vanilla deals a targeting
   hand when these packs open; over RPC at blind select, both sides sit in
   SMODS_BOOSTER_OPENED but live's hand stays empty with an untouched deck
   (seeds LSMWZ3M4 step 21, LSDTVEW6 step 27). In our census across ~400
   organic games, every skip-opened tag pack either diverged or had to be
   truncated — the flow is a complete dead zone.
3. Hang with lasting damage. Stacked tag packs (Double Tag + a pack tag)
   hang the pack endpoint — related to but distinct from the triggers in fix!(lua.endpoints): buy hangs packs with thin decks #198
   and fix!(lua.endpoints): buy/pack hang when Celestial pack contains Black Hole #199. Worse, after the hang the game's event processing stays broken for
   the remainder of the run even though gamestate still reads consistent
   (probed directly: a round-end mechanic that reliably fired in a fresh session
   stopped firing after the hang, with all RNG streams still matching).

Suspected root cause: the SMODS booster flow at blind select diverges from the
shop pack flow the endpoints were built around (cf. #202, which covers use/sell
during SMODS_BOOSTER_OPENED).

Impact

Skipping a blind for a pack tag is one of the stronger lines in the game.
Over RPC it currently either loses the pack contents silently (worst case for a
bot: the pick "succeeds") or kills the session. Our harness had to veto all
pack-tag skips to keep runs alive, which removes a real strategy from any bot
that wants to be faithful.

Suggested Fix

• pack should verify the pick actually applied (pack card count / target area
  changed) before reporting success, and return an error otherwise.
• Deal the targeting hand for Arcana/Spectral tag packs the way the shop flow
  does, or reject the open with a clear error instead of hanging.

Repro bundles available for all seeds cited.