docs(adr): cite IANA and TLS RFCs for destination and identity ADRs

[seonghobae]

Draft only. Do not merge. Do not mark Ready.

Branched from current main, not stacked on open product PRs (including #219, #152, #208, #149, #209, #220, #37, #46, or any other open PR).

Docs only. No Rust, tests, Cargo, Dockerfile, or workflow changes. Accepted ADR 0004 and ADR 0006 decision text and Accepted status are unchanged. This adds APA 7th References with the live-checked DOI/URL locators those decisions already name.

What changed

1. ADR 0004 now has an APA 7th References section citing RFC 6890, the two IANA special-purpose registries, and RFC 9110 only.
2. ADR 0006 Standards is now References with the same existing decision prose plus APA locators for RFC 5280, RFC 9846, and RFC 9525 only. RFC 9846 remains the current TLS 1.3 authority (obsoletes RFC 8446). No OCSP/CRL claim.
3. ADR index has a one-line note after the Accepted table that 0004/0006 now carry APA locators. The table itself is unchanged.
4. CHANGELOG.md Unreleased/Changed has one short line.
5. Customer README.md already pointed at docs/adr/; it was not rewritten.

Verified locators (live-checked 2026-08-25)

Source	Locator	Live-check
Cotton, M., Vegoda, L., Bonica, R. (Ed.), & Haberman, B. (2013). Special-purpose IP address registries (RFC 6890). RFC Editor.	https://doi.org/10.17487/RFC6890 · https://www.rfc-editor.org/rfc/rfc6890	Crossref MATCH (M. Cotton, L. Vegoda, B. Haberman; editor R. Bonica; 2013-04). rfc-editor JSON authors ["M. Cotton", "L. Vegoda", "R. Bonica, Ed.", "B. Haberman"], HTTP 200.
Internet Assigned Numbers Authority. (n.d.). IANA IPv4 Special-Purpose Address Registry. Retrieved August 25, 2026, from https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml	same URL	HTTP 200 (canonicalizes to /iana-ipv4-special-registry).
Internet Assigned Numbers Authority. (n.d.). IANA IPv6 Special-Purpose Address Registry. Retrieved August 25, 2026, from https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml	same URL	HTTP 200 (canonicalizes to /iana-ipv6-special-registry).
Fielding, R. (Ed.), Nottingham, M. (Ed.), & Reschke, J. (Ed.). (2022). HTTP semantics (RFC 9110). RFC Editor.	https://doi.org/10.17487/RFC9110 · https://www.rfc-editor.org/rfc/rfc9110	Crossref MATCH (editors R. Fielding, M. Nottingham, J. Reschke; 2022-06). rfc-editor JSON authors match, HTTP 200.
Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., & Polk, W. (2008). Internet X.509 public key infrastructure certificate and certificate revocation list (CRL) profile (RFC 5280). RFC Editor.	https://doi.org/10.17487/RFC5280 · https://www.rfc-editor.org/rfc/rfc5280	rfc-editor JSON authors ["D. Cooper", "S. Santesson", "S. Farrell", "S. Boeyen", "R. Housley", "W. Polk"], May 2008, HTTP 200.
Rescorla, E. (2026). The Transport Layer Security (TLS) protocol version 1.3 (RFC 9846). RFC Editor.	https://doi.org/10.17487/RFC9846 · https://www.rfc-editor.org/rfc/rfc9846	rfc-editor JSON authors ["E. Rescorla"], July 2026, HTTP 200.
Saint-Andre, P., & Salz, R. (2023). Service identity in TLS (RFC 9525). RFC Editor.	https://doi.org/10.17487/RFC9525 · https://www.rfc-editor.org/rfc/rfc9525	rfc-editor JSON authors ["P. Saint-Andre", "R. Salz"], November 2023, HTTP 200.

Not cited: drafts, unmerged PRs, cancelled OpenCode/Strix scans, invented DNS-rebinding papers, RFC 8446 as current, rustls crate docs as standards.

Leave this pull request as GitHub Draft. Do not merge. Do not mark Ready.

  

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