docs: enforce CFF 1.2.0 standards

- Convert placeholder paper references from type: article to type: unpublished
  with honest notes about pending identifiers
- Remove fake journal/arXiv placeholder from Giani et al.
- Add CFF standards section to AGENTS.md with validation command and rules for
  DOIs, preprints, non-academic sources, and et al. usage

Build: 2978 jobs, 0 errors (lake build)

AGENTS.md

@@ -262,7 +262,30 @@ Current Research Stack cornfield ref (for cross-repo lookup only):
 
 ---
 
-## 13. SilverSight-Specific Boundaries
+## 13. Citation File Format (CFF) Standards
+
+`CITATION.cff` must remain valid CFF 1.2.0 and be checked after any edit.
+
+- Run `python3 -c "import yaml; yaml.safe_load(open('CITATION.cff'))"` to verify
+  YAML syntax.
+- Include all required fields: `cff-version`, `message`, `title`, `authors`,
+  `type`.
+- Use `repository-code` and `url` for the project; add `date-released` and
+  `license` when known.
+- For references:
+  - Prefer DOI or arXiv ID. Use `url` only when no persistent identifier exists.
+  - Use `type: unpublished` for preprints or works without a confirmed venue;
+    do not invent journal names or placeholder identifiers.
+  - For non-academic sources (e.g. Reddit posts, blog posts, forum threads),
+    use `type: generic` or `type: misc` with a `url` and `date-accessed` note.
+  - Avoid `et al.` as an author entry when a full author list is available;
+    use it only as a last resort for long author lists.
+- When porting from Research Stack, add Research Stack as a `software`
+  reference, not as a co-author.
+
+---
+
+## 14. SilverSight-Specific Boundaries
 
 - `Core/SilverSightCore.lean` is the root authority. It contains no sorries in
   the active surface.

CITATION.cff

@@ -60,9 +60,9 @@ references:
     notes: "Parent research repository from which SilverSight ports proven Lean modules, agent contracts, and fixed-point semantics."
 
   # NOTE: The following four references are domain sources used by the
-  # PVGS_DQ_Bridge and BindingSite libraries. arXiv IDs and DOIs should be
-  # back-filled once the final preprint identifiers are confirmed.
-  - type: article
+  # PVGS_DQ_Bridge and BindingSite libraries. They are recorded as
+  # `unpublished` until DOIs, arXiv IDs, or journal pages are confirmed.
+  - type: unpublished
     authors:
       - family-names: "Giani"
         given-names: "A."
@@ -72,9 +72,8 @@ references:
         given-names: "C."
     title: "Photon-Varied Gaussian States"
     year: 2025
-    journal: "arXiv:2505.XXXXX"
-    notes: "Placeholder arXiv ID pending final preprint assignment."
-  - type: article
+    notes: "Preprint / in-preparation. Identifier pending confirmation."
+  - type: unpublished
     authors:
       - family-names: "Chabaud"
         given-names: "U."
@@ -82,17 +81,20 @@ references:
         given-names: "S."
     title: "Stellar representation of non-Gaussian quantum states"
     year: 2022
-  - type: article
+    notes: "Full citation details pending DOI or arXiv ID."
+  - type: unpublished
     authors:
       - family-names: "Pizzimenti"
         given-names: "C."
       - family-names: "et al."
     title: "Wigner negativity of superpositions"
     year: 2024
-  - type: article
+    notes: "Full citation details pending DOI or arXiv ID."
+  - type: unpublished
     authors:
       - family-names: "Wassner"
         given-names: "M."
       - family-names: "et al."
     title: "Single quadrature noise tomography"
     year: 2025
+    notes: "Full citation details pending DOI or arXiv ID."