fix(packs/register): remove bare '.' closings + ratify gate refuses them

The widened 100-pack tour surfaced four packs whose closings bucket
included a bare '.' entry: assertive_v1, blunt_v1, dry_v1, and
mathematical_v1. Seeded variation selects from buckets uniformly, so
roughly 1/N of turns would emit a '..'-style surface artefact
(e.g. 'Truth is what is true..') when '.' was selected and appended
to a surface CORE's deterministic realizer already terminated with
'.'.

This commit:
  * Strips the bare '.' entry from the four affected packs' closings.
    The remaining entries (e.g. ' — qed.', ' — that's it.', '') all
    carry their own leading separator, so concatenation produces a
    clean surface.
  * Re-runs scripts/ratify_register_packs.py to re-seal each pack's
    mastery_report.json with a fresh pack_source_sha256 and
    self_seal_sha256 — these companion files are part of the diff
    because pack content changed.
  * Adds _validate_discourse_markers_shape() to
    scripts/ratify_register_packs.py as defense in depth. The new
    R4-tier gate refuses any closing entry whose first character is
    bare sentence-final punctuation ('.', '!', '?', ';', ':') or an
    alphanumeric — both classes would produce concatenation artefacts.
    Ellipsis ('...', '…') is explicitly exempt as a legitimate
    stylistic ending.

Verified:
  * core eval cognition byte-identical (the eval runs unregistered)
  * tests/test_cognition_eval_register_matrix.py: 801 passed in 5:23
    (100 registers × 8 projection invariants + meta-test), confirming
    the closing fix did not perturb ADR-0072 trace_hash invariance
    or any per-case projection.
  * Hand-verification across {assertive,blunt,dry,mathematical}_v1
    × 4 prompts = 16 surfaces: 0 remaining double-period artefacts.
  * Re-running ratify against a re-introduced bad closing produces
    SystemExit with the new gate's diagnostic message.

mathematical_v1 now reads beautifully under "What is light?":
  "Lemma:  Light is visible medium that reveals truth. — qed."

packs/register/assertive_v1.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Assertive register — declarative markers, no hedging.",
   "schema_version": "1.0.0",
-  "mastery_report_sha256": "44750505a1fce4eaadf47a4fe5a22c8d3d53d41957f5d161797a539dc9258844",
+  "mastery_report_sha256": "785f079aad5e2492ed7d054716ed2ecf897622230bd2cc96d419cf0ebe9cc9f5",
   "display_name": "Assertive",
   "depth_preference": "standard",
   "realizer_overrides": {
@@ -19,8 +19,7 @@
     ],
     "transitions": [],
     "closings": [
-      "",
-      "."
+      ""
     ]
   }
 }

packs/register/assertive_v1.mastery_report.json

@@ -3,7 +3,7 @@
     "depth_preference": "standard",
     "discourse_markers_empty": false,
     "marker_bucket_sizes": {
-      "closings": 2,
+      "closings": 1,
       "openings": 4,
       "transitions": 0
     },
@@ -16,10 +16,10 @@
   },
   "failure_reasons": [],
   "issued_at": "2026-05-20T00:00:00Z",
-  "pack_source_sha256": "a6d1c49aee2ef5222c7e4481ddb968b40be4eb13cae6eaa14ad140a1a60ec128",
+  "pack_source_sha256": "f542dae9062ee981018846517da65c6480200138e029df7254669b5b0a9dfc44",
   "ratification_method": "seeded_variation_replay_equivalence",
   "ratified": true,
   "register_id": "assertive_v1",
-  "report_sha256": "44750505a1fce4eaadf47a4fe5a22c8d3d53d41957f5d161797a539dc9258844",
+  "report_sha256": "785f079aad5e2492ed7d054716ed2ecf897622230bd2cc96d419cf0ebe9cc9f5",
   "schema_version": "1.0.0"
 }

packs/register/blunt_v1.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Blunt register — short, sharp, no qualification.",
   "schema_version": "1.0.0",
-  "mastery_report_sha256": "2925ce07bd132a235296098d135ad46f171efc46f2cead69b06f52d309661d33",
+  "mastery_report_sha256": "0c435910a295c7cade443cccfd175c90f0302cc90f0c5a6c613ef62c190462ed",
   "display_name": "Blunt",
   "depth_preference": "terse",
   "realizer_overrides": {
@@ -21,8 +21,7 @@
     ],
     "transitions": [],
     "closings": [
-      "",
-      "."
+      ""
     ]
   }
 }

packs/register/blunt_v1.mastery_report.json

@@ -3,7 +3,7 @@
     "depth_preference": "terse",
     "discourse_markers_empty": false,
     "marker_bucket_sizes": {
-      "closings": 2,
+      "closings": 1,
       "openings": 4,
       "transitions": 0
     },
@@ -18,10 +18,10 @@
   },
   "failure_reasons": [],
   "issued_at": "2026-05-20T00:00:00Z",
-  "pack_source_sha256": "71a9bc92336de59c4014777e5d3e36bdece30c6519e21f7fd8df984f7847309f",
+  "pack_source_sha256": "6f148b6f90971ff4be82d8fa22001d890e2f8c98ac8f6caa4f453328ba1eabcd",
   "ratification_method": "seeded_variation_replay_equivalence",
   "ratified": true,
   "register_id": "blunt_v1",
-  "report_sha256": "2925ce07bd132a235296098d135ad46f171efc46f2cead69b06f52d309661d33",
+  "report_sha256": "0c435910a295c7cade443cccfd175c90f0302cc90f0c5a6c613ef62c190462ed",
   "schema_version": "1.0.0"
 }

packs/register/dry_v1.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Dry register — understated, factual.",
   "schema_version": "1.0.0",
-  "mastery_report_sha256": "1f3232b4eb99d6df156de3f34c5e8fe24f8453ac04a59bb3bd41553ffc5b169a",
+  "mastery_report_sha256": "6f413313c0cc42bae47dfb3f1273d429006c0b4405a48764ad6aac8d69da3ebc",
   "display_name": "Dry",
   "depth_preference": "standard",
   "realizer_overrides": {
@@ -19,7 +19,6 @@
     "transitions": [],
     "closings": [
       "",
-      ".",
       " — that's it."
     ]
   }

packs/register/dry_v1.mastery_report.json

@@ -3,7 +3,7 @@
     "depth_preference": "standard",
     "discourse_markers_empty": false,
     "marker_bucket_sizes": {
-      "closings": 3,
+      "closings": 2,
       "openings": 3,
       "transitions": 0
     },
@@ -16,10 +16,10 @@
   },
   "failure_reasons": [],
   "issued_at": "2026-05-20T00:00:00Z",
-  "pack_source_sha256": "eccd21f4b00102526fc22d28bac38e091dbda30a408848ac6f42bbfc16716bfb",
+  "pack_source_sha256": "0db49fb251edc60106c04ca75b3422b4661a26e8e1ac17cd9ef2c7973f6617c8",
   "ratification_method": "seeded_variation_replay_equivalence",
   "ratified": true,
   "register_id": "dry_v1",
-  "report_sha256": "1f3232b4eb99d6df156de3f34c5e8fe24f8453ac04a59bb3bd41553ffc5b169a",
+  "report_sha256": "6f413313c0cc42bae47dfb3f1273d429006c0b4405a48764ad6aac8d69da3ebc",
   "schema_version": "1.0.0"
 }

packs/register/mathematical_v1.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Mathematical register — proof-cadence.",
   "schema_version": "1.0.0",
-  "mastery_report_sha256": "04e9a09cce4e599781b2d4994383cebf4f6529391f58005a84e69363494508c2",
+  "mastery_report_sha256": "b85e2505fe647aa474b599cfa447c3677ad92c7c305d34ae63c97c8b5ba82fb6",
   "display_name": "Mathematical",
   "depth_preference": "standard",
   "realizer_overrides": {
@@ -21,7 +21,6 @@
     "transitions": [],
     "closings": [
       "",
-      ".",
       " — qed."
     ]
   }

packs/register/mathematical_v1.mastery_report.json

@@ -3,7 +3,7 @@
     "depth_preference": "standard",
     "discourse_markers_empty": false,
     "marker_bucket_sizes": {
-      "closings": 3,
+      "closings": 2,
       "openings": 4,
       "transitions": 0
     },
@@ -17,10 +17,10 @@
   },
   "failure_reasons": [],
   "issued_at": "2026-05-20T00:00:00Z",
-  "pack_source_sha256": "f7885f683ad806730ede0ce1a0a4f3d2503ead583719f055949e2a1ccdad281e",
+  "pack_source_sha256": "59be9a46ca10a612aa201fcb3736d1791505b9fea5add9b40ac5e57e21f84028",
   "ratification_method": "seeded_variation_replay_equivalence",
   "ratified": true,
   "register_id": "mathematical_v1",
-  "report_sha256": "04e9a09cce4e599781b2d4994383cebf4f6529391f58005a84e69363494508c2",
+  "report_sha256": "b85e2505fe647aa474b599cfa447c3677ad92c7c305d34ae63c97c8b5ba82fb6",
   "schema_version": "1.0.0"
 }

scripts/ratify_register_packs.py

@@ -266,6 +266,64 @@ def _validate_per_intent_block(
                 )
 
 
+_BARE_SENTENCE_FINAL_PUNCT: frozenset[str] = frozenset(".!?;:")
+"""Closing entries beginning with one of these characters concatenate
+directly onto a surface that already ends in ``.`` (CORE's deterministic
+realizer always emits a trailing period) and produce double-punctuation
+artefacts like ``true..``.  Ellipsis (``...`` / ``…``) is exempt — that
+is a legitimate stylistic ending in its own right.
+"""
+
+
+def _validate_discourse_markers_shape(pack: dict, register_id: str) -> None:
+    """Reject discourse-marker shapes that would produce surface
+    artefacts when concatenated to a sentence-final surface.
+
+    Catches the class of authoring bug discovered during the 100-pack
+    widened tour: a bare ``"."`` closing yields ``..`` when seeded
+    variation picks it.  Defense in depth — pack authors should not
+    have to remember the realizer's trailing-period convention.
+
+    Rules (closings only — openings always lead the surface with a
+    space separator inserted by the composer):
+      * ``""`` is always legal (no-op closing)
+      * Entries starting with bare ``.``, ``!``, ``?``, ``;``, ``:``
+        are refused — they double-punctuate.  Ellipsis (``"..."`` /
+        ``"…"``) is exempt and remains legal.
+      * Entries starting with an alphanumeric character are refused —
+        they would join with no separator, e.g. ``"true.holds."``.
+    """
+    markers = pack.get("discourse_markers", {})
+    if not isinstance(markers, dict):
+        return  # shape-only — schema validator owns dict-vs-not
+    closings = markers.get("closings", [])
+    if not isinstance(closings, list):
+        return
+    for entry in closings:
+        if not isinstance(entry, str) or entry == "":
+            continue
+        first = entry[0]
+        if entry.startswith(("...", "…")):
+            continue
+        if first in _BARE_SENTENCE_FINAL_PUNCT:
+            raise SystemExit(
+                f"R4 gate refuses {register_id!r}: discourse_markers."
+                f"closings[{entry!r}] starts with bare sentence-final "
+                f"punctuation. CORE's realizer always emits a trailing "
+                f"'.', so {entry!r} concatenates to '..'-style "
+                f"artefacts. Either drop the entry or prefix it with a "
+                f"separator (e.g. ' — note.')."
+            )
+        if first.isalnum():
+            raise SystemExit(
+                f"R4 gate refuses {register_id!r}: discourse_markers."
+                f"closings[{entry!r}] starts with an alphanumeric "
+                f"character. Closings concatenate directly to the "
+                f"surface — prefix with a space or punctuation "
+                f"separator (e.g. ' note.' or ' — note.')."
+            )
+
+
 def _markers_have_content(pack: dict) -> bool:
     """True iff openings or closings has at least one entry (R4 needs
     one of these populated for a marker-using ratification).
@@ -301,6 +359,7 @@ def _ratify_one(pack_path: Path, register_id: str) -> tuple[dict, dict[str, Any]
     # must have at least one of openings/closings populated.  Null
     # registers pass trivially.
     _validate_overrides_known_keys(pack, register_id)
+    _validate_discourse_markers_shape(pack, register_id)
 
     null_register = _is_null_register(pack)
     overrides = pack.get("realizer_overrides", {}) or {}