SPIKE: Protocol 28 (CAP-0084)

[sisuresh]

SPIKE bumping nightly-next in images.json to Protocol 28 (CAP-0084). Core (and all deps) build from source here, so this does not wait on any published -vnext deb/image.

Changes

• nightly-next.config.protocol_version_default: 27 → 28 (horizon_skip_protocol_version_check kept).
• Repoint nightly-next deps to the CAP-0084 SPIKE branches on sisuresh/* @ p28-cap-0084: xdr, core, rpc, horizon, lab.
• Kept core --enable-next-protocol-version-unsafe-for-production and horizon pkg path.
• Added pull_request to nightly-next.events so CI actually builds this variant on the PR — SPIKE-only, revert before non-draft merge.
• latest/testing/future/nightly untouched.

Deferred

• friendbot (@main) and galexie (@protocol-next) left unchanged — out of scope; galexie still pins go-stellar-sdk@protocol-next (risk to watch).
• Productionize: flip repo/ref back to stellar/* at tagged release, drop pull_request event, undraft.
• etc/config-settings/ only covers up to p26; p28 Soroban limits fall back to nearest lower dir — not a blocker.

Cross-links (P28 CAP-0084 chain)

stellar-xdr#307 · rs-stellar-xdr#552 · rs-soroban-env#1700 · rs-soroban-sdk#1924 · stellar-core#5337 · go-stellar-sdk#5961 · stellar-horizon#203 · stellar-rpc#837 · js-stellar-base#981 · js-stellar-sdk#1507 · js-stellar-xdr-json#59 · laboratory#2141

[sisuresh]

Protocol 28 · CAP-0084 (Muxed Contract Addresses) — SPIKE PR chain

Full cross-repo chain opened in this run (upstream → downstream):

• XDR source: SPIKE: Protocol 28 (CAP-0084) stellar-xdr#307
• Rust XDR anchor: SPIKE: Protocol 28 (CAP-0084) rs-stellar-xdr#552
• Host: SPIKE: Protocol 28 (CAP-0084) rs-soroban-env#1700
• SDK (Rust): SPIKE: Protocol 28 (CAP-0084) rs-soroban-sdk#1924
• Core: SPIKE: Protocol 28 (CAP-0084) stellar-core#5337
• Go SDK: SPIKE: Protocol 28 (CAP-0084) go-stellar-sdk#5961
• Horizon: SPIKE: Protocol 28 (CAP-0084) stellar-horizon#203
• RPC: SPIKE: Protocol 28 (CAP-0084) — muxed contract addresses stellar-rpc#837
• JS base: SPIKE: Protocol 28 (CAP-0084) js-stellar-base#981
• JS SDK: SPIKE: Protocol 28 (CAP-0084) js-stellar-sdk#1507
• JS xdr-json: SPIKE: Protocol 28 (CAP-0084) js-stellar-xdr-json#59
• Laboratory: SPIKE: Protocol 28 (CAP-0084) laboratory#2141
• Quickstart (docker): SPIKE: Protocol 28 (CAP-0084) #950

All draft/SPIKE, pinned to unmerged upstream heads; re-pin to merged SHAs as each lands.