experiments: thesis-G interdependency design note (non-canonical spike)

experiments/thesis-g/README.md

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+# experiments/ — non-canonical sandbox
+
+**Nothing in this directory is canonical.** It is a standalone spike space for
+learning about theses the core has deliberately *not* opened, without touching
+core ASSAY.
+
+Rules that keep it from polluting the core:
+
+- No file here is imported by `src/`, `schema/`, `specs/`, or `docs/research/`.
+- No schema change, no `npm run gen`, no LinkML class. Sandboxes define their own
+  local throwaway types.
+- No register decision (DEC). Findings feed back only as **flagged concept §6
+  candidates** for a future batch (DEC-2) — they assert nothing.
+- Reads of core fixtures are one-way and read-only.
+
+## thesis-g/ — interdependency (PMESII node-link)
+
+Probes concept §6.3's open question: *does thesis G admit any honest v1 slice, or
+is it horizon-only?* Thesis G is flagged "highest false-precision risk" (concept
+§1); `assay-knowledge-model.md:484` keeps PMESII shapes out of the core on purpose.
+
+- `thesis-g-interdependency.md` — the design note (this spike's DEC-11-shaped
+  gate, kept *out* of `docs/research/` because it gates no build stage and
+  decides nothing canonical).
+- `demonstrator.html` — the built three-panel demonstrator. Self-contained and
+  offline; open it directly in a browser (no build step, no network, no `src/`
+  import). Picks a question, reads the Meridian-derived PMESII graph three ways
+  (reachability / signed direction / weighted-trap), and runs an in-page honesty
+  self-check. `preview-*.png` are verification screenshots.