engine: casting and activating from zones other than the hand

[ninthworld]

Parent: #706. One of the exclusion families blocking the 104 M19 cards the catalog does not yet define.

Exclusion (crates/sage-engine/data/exclusions.json): Casting from a zone other than the hand, the command zone, or a one-turn graveyard permission — no alternative-cost or zone-specific casting mechanism (flashback, escape, adventure).

10 of the 104 missing M19 cards live in this family. allow_casting_from_graveyard already proves the seam works — cards stay in their zone, are offered beside the hand, and go through the same action, stack object, and timing gates. What is missing is the rest of the shapes.

M19 cards blocked (10)

#	Card	What it needs
116	Reassembling Skeleton	an activated ability that functions from the graveyard, returning its own card to the battlefield
202	Talons of Wildwood	the same, returning its own card to hand
88	Bone Dragon	the same, with a cost that exiles other graveyard cards
160	Spit Flame	a triggered ability that functions from the graveyard
229	Crucible of Worlds	permission to play lands from a graveyard (today's permission is for casting, and a land is played, CR 116.2a)
134	Dark-Dweller Oracle	permission to play one exiled card this turn
129	Apex of Power	permission to cast from among cards exiled this turn
228	Chaos Wand	casting an exiled card without paying its mana cost
52	Djinn of Wishes	playing the top card of a library without paying its cost
65	Omniscience	casting from hand without paying mana costs

Two independent primitives are tangled here and should be separated: which zone a card may be played from, and what it costs (an alternative cost of nothing). Reassembling Skeleton and Talons of Wildwood need only the first.

Scope

1. Abilities that function while their source is in a graveyard — the valid_actions offer, the activation path, and the ability collector all currently walk the battlefield only.
2. A per-turn exile permission mirroring the existing graveyard permission, recorded with the turn it was granted on.
3. Playing lands under a permission, distinct from casting.
4. An alternative "without paying its mana cost" payment, added only alongside a card that needs it.

Acceptance criteria

• Reassembling Skeleton is authored and tested first — it is the smallest card that proves graveyard-sourced activation.
• A permission is scoped to the turn it was granted on and cannot leak across a turn boundary.
• Timing gates (sorcery speed, priority) are enforced identically to a hand cast, and re-checked in apply_action rather than only at offer time.
• The exclusion narrows; make compat regenerated and committed.
• docs/card-schema.md updated; make verify green.

[ninthworld]

Progress in #775 (merged as 443c66f). No new zone work landed in this tranche; the graveyard half closed earlier in #763 and #767. Recording the current state so the issue is accurate:

Built: a one-turn permission to cast from a graveyard, a continuous permission to play lands from one (Crucible of Worlds), and an activated or triggered ability that returns its own card out of one (Reassembling Skeleton, Talons of Wildwood, Spit Flame).

Still missing: a per-turn exile permission (Dark-Dweller Oracle, Apex of Power), playing off the top of a library (Djinn of Wishes), casting without paying a mana cost (Chaos Wand, Omniscience), and any alternative-cost or zone-specific mechanism. An activation cost that exiles from a graveyard did land (Graveyard Marshal), so Bone Dragon is closer than the issue's table suggests.