Restore safe Duke grants in early legacy games

docs/CURRENT_STATUS.md

@@ -17,6 +17,15 @@ open mode gates.
 
 ## Current checkpoint and work
 
+**Early legacy Duke proof and occupied Ecaz displacement — 29 October.
+Prototyped / Partial.** An unstamped game can establish a clear capture history
+from public first-turn, pre-battle phase and continuation state; an explicit
+uncertain marker and later or ambiguous states remain guarded. An actual public
+occupied-Ecaz displacement of an ordinary living Duke grant also clears the
+marker. Eleven related files pass 73 cases, including native setup and occupation
+with controlled staging. Wider interactions, capture assurance and deployed verification remain
+open. [Scope](ECAZ_DUKE_ACQUISITION.md#public-first-turn-proof-and-occupied-ecaz-displacement--29-october-2026).
+
 **Resolving public Duke capture uncertainty — 29 October. Prototyped /
 Partial.** Publicly established ordinary Duke battle, revival, acquisition or named
 death outcomes clear the conservative capture marker, including in older games

docs/ECAZ_DUKE_ACQUISITION.md

@@ -1,5 +1,28 @@
 # Ecaz Ambassador: direct Duke acquisition
 
+## Public first-turn proof and occupied Ecaz displacement — 29 October 2026
+
+**Prototyped / Partial.** An unstamped legacy game can establish clear Duke
+capture history from public state while it is playing in turn one, phases 0–5,
+with no battle, previous battle context or pending capture, and no capture
+response or decision. The check does not inspect Duke custody or the selected
+captive. Explicit uncertainty and later or ambiguous states remain guarded.
+Viewing the game does not mutate the receipt; automatic normalization or an
+accepted live action records the proven clear state. Later qualifying capture
+events can make the history uncertain again.
+
+Actual occupied-Ecaz displacement of a living ordinary Duke grant also clears
+the marker: the displacement is publicly logged before the occupier's eligible
+recipient choice. Merely having an occupation or an unrelated continuation
+does not establish that displacement. Existing eligibility and custody checks
+remain in force.
+
+Focused tests cover a real Advanced opening and Ambassador arrival with an
+unstamped receipt, public-state boundary and private-custody comparisons, and
+the real occupied-Ecaz battle with a staged prior ordinary grant and uncertainty
+receipt. Broader combinations, capture assurance and deployed verification
+remain open; these prototypes do not certify a complete rules mode.
+
 ## Public resolution of capture uncertainty — 29 October 2026
 
 **Prototyped / Partial.** A public event that establishes the actual unique
@@ -14,7 +37,8 @@ new uncertainty. The existing eligibility and custody checks still apply.
 An Advanced Harkonnen game with clear public history can now also use the
 provisional same-recipient conversion from another temporary tenure. A current
 ordinary Ecaz Ambassador tenure cannot be redundantly renewed. The public
-history safeguard remains uniform when the marker is uncertain or absent.
+history safeguard remains uniform when the marker is uncertain, or absent
+without the public first-turn proof above.
 
 Twelve related files pass 87 cases. The real battle fixture verifies a later
 Ambassador grant and renewed uncertainty after capture. Other action fixtures
@@ -31,9 +55,9 @@ Once that possibility arises it stays recorded until a supported public
 resolution above. Direct Ambassador acquisition
 and the automatic Advanced alliance loan are uniformly unavailable while the
 record is uncertain, regardless of actual hidden custody. A game saved before
-this receipt existed is also treated conservatively: its truncated history
-cannot prove that a concealed capture never occurred. No saved game is reset
-or retroactively assigned a fabricated clean history.
+this receipt existed remains conservative unless its public first-turn state
+proves capture could not yet have occurred, as described above. No saved game
+is reset or assigned a fabricated clean history.
 
 When the record is clear, a plain Advanced Ecaz–Harkonnen game can use the
 ordinary direct grant and automatic new-ally loan; the original disc, reusable

docs/RULE_DECISIONS.md

@@ -1,10 +1,20 @@
 # Rule decision index
 
+## First-turn Duke proof and occupied Ecaz displacement — 29 October 2026
+
+**Prototyped / Partial.** Public first-turn pre-battle state can prove that an
+unstamped legacy game has no earlier capture; explicit uncertainty and ambiguous
+or later history remain guarded. The public occupied-Ecaz displacement of a
+living ordinary Duke grant also resolves uncertainty. This is a provisional
+online policy, with broader interactions and deployed verification still open.
+[Scope](ECAZ_DUKE_ACQUISITION.md#public-first-turn-proof-and-occupied-ecaz-displacement--29-october-2026).
+
 ## Public resolution of Duke capture uncertainty — 29 October 2026
 
 A revealed ordinary Duke battle or named public revival, acquisition or death resolves the prior
 capture uncertainty; a later possible Harkonnen capture can restore it. This
-is a provisional online policy and does not infer legacy capture history.
+is a provisional online policy; the bounded first-turn public proof above also
+applies to eligible unstamped legacy games.
 [Scope](ECAZ_DUKE_ACQUISITION.md#public-resolution-of-capture-uncertainty--29-october-2026).
 
 ## Duke Ambassador capture uncertainty — 29 October 2026
@@ -12,7 +22,8 @@ is a provisional online policy and does not infer legacy capture history.
 Fresh games record whether a public capture could have involved Duke, without
 using the secret selection. Direct acquisition and automatic alliance loan
 are uniformly guarded while that history is uncertain; legacy games without
-the receipt remain conservative. This is a provisional online policy.
+the receipt remain conservative except where the first-turn public proof above
+applies. This is a provisional online policy.
 [Scope](ECAZ_DUKE_ACQUISITION.md#public-capture-uncertainty--29-october-2026).
 
 ## Concealed Duke and Ghola guidance — 29 October 2026