docs(citation): add the author's ORCID (0000-0002-3078-6652) to citation metadata (#103)

Adds the author's ORCID iD,
[0000-0002-3078-6652](https://orcid.org/0000-0002-3078-6652), to this
repo's citation metadata.

- CITATION.cff: inserted orcid
- codemeta.json: inserted @id

Part of an estate-wide rollout. The template's own `0000-0000`
placeholder is fixed at source in hyperpolymath/rsr-template-repo#214.
No licence fields were added or changed.

### Red checks deferred to tracking issues

This PR edits only citation metadata. Each red check below is tracked in
the linked issue, with its state on the base branch.

- Deferred: `rust-ci / Cargo check + clippy + fmt` — red on base
`ae96371` → #105
- Deferred: `governance / Guix primary / Nix fallback policy` — red on
base `ae96371` → metadatastician/standards#994

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01B2ARtAVppZ7x7mVY5u6nAz

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: hyperpolymath

CITATION.cff

@@ -4,6 +4,7 @@ message: "If you use this software, please cite it as below."
 type: software
 authors:
   - given-names: "Jonathan D.A."
+    orcid: "https://orcid.org/0000-0002-3078-6652"
     family-names: "Jewell"
     email: "j.d.a.jewell@open.ac.uk"
     affiliation: "hyperpolymath"

codemeta.json

@@ -6,6 +6,7 @@
       "@type": "Person",
       "givenName": "Jonathan D.A.",
       "familyName": "Jewell",
+      "@id": "https://orcid.org/0000-0002-3078-6652",
       "email": "j.d.a.jewell@open.ac.uk",
       "affiliation": {
         "@type": "Organization",