fix(newos4): world_model_query default path parses again (v4.6.83-84)

_modelDigest() returned JSON.stringify(...) cut at 4000 chars plus '…(digest truncated)'. The
tool then did JSON.parse() on it, so the default detail threw 'Unexpected end of JSON input'
every single call; detail:'full' worked only because it returned the object untouched.

The digest now returns an OBJECT (_modelSnapshot) and shrinks by reducing list lengths, then by
dropping whole sections with an explicit 'omitted' list. The string form is generated at the
edge and is always valid JSON.

Verified: default call -> no error, 13-key snapshot, facts answered; caps 400/1200/4000 all under
cap and parseable; the residual floor at cap 200 is identity fields only.

1 files changed, 4 insertions, 1 deletions

diff --git a/modules/core/module-aiassist.js b/modules/core/module-aiassist.js
index c3ebe1f..55dde6f 100644
--- a/modules/core/module-aiassist.js
+++ b/modules/core/module-aiassist.js
@@ -3170,7 +3170,10 @@ buildSystemPrompt() {
                                 facts: wm._answerQuery(a.question || ''),
                                 version: wm._model.version,
                                 synthesized: wm._model.synthesized,
-                                snapshot: (a.detail === 'full') ? wm._model : JSON.parse(wm._modelDigest())
+                                // v4.6.83: this was JSON.parse(wm._modelDigest()) and the digest was a
+                                // string truncated mid-token, so the default path always threw
+                                // "Unexpected end of JSON input". The model now hands back an object.
+                                snapshot: (a.detail === 'full') ? wm._model : wm._modelSnapshot()
                             };
                             return JSON.stringify(wmOut);
                         }