simulators/: persist the survey, and let it shrink two of the three tracks

Eight profiles on a common schema, each marking what was checked against a
source this session and what is background recollection. Three are marked
unverified in full — Machinations, the play substrates, most of RBG — and
say so rather than reading as evaluations. Written straight after three
review rounds whose entire yield was claims outrunning what had been
checked, so the confidence rule is the first thing in the README.

The survey changed the plan, which is what a survey is for.

Track C was described in Positioning as open ground. It is not: Browne
published 57 criteria for game quality, and Ai Ai already computes
designer-facing measures — drama, lead changes, branching factor,
completion, duration — from played games. The track becomes adopt, credit
and find the gap. The gap looks real: those measures presume a leader, and
SHARED GROUND has none — Modes.csv gives its tiebreak as "Not applicable".

Track B probably adopts rather than builds. OpenSpiel implements CFR,
best-response and exploitability over games that are simultaneous-move,
imperfect-information and co-operative, which is all four of GROUND's
awkward properties. "Does ATTACK ever pay" is a best-response question,
and we spent three review rounds refining a two-policy sweep for it. The
first Track B task is now one question — is exploitability meaningful for
a co-operative game with a shared threshold — not a build.

The cost of not surveying earlier is therefore measurable, and is recorded
rather than glossed.

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

INTENT.md

@@ -68,6 +68,13 @@ Three tracks, none started, in [`specs/Positioning.md`](specs/Positioning.md) §
 **game theory as the lens on dynamics**, and **assimilated knowledge about
 why games work**, offered to designers.
 
+The field is surveyed in [`simulators/`](simulators) — one profile per
+system, each marking what was checked and what is recollection. **The
+survey already shrank two of the three tracks**: Browne's 57 criteria and
+Ai Ai's authoring metrics mean track three is *adopt and find the gap*,
+not *invent*; and OpenSpiel's exploitability is the standard instrument
+for the question track two exists to ask.
+
 ## Why GROUND first
 
 GROUND requires modest physics but sophisticated social state, simultaneous