docs: stop pointing contributors at the repositories being archived

CHANGELOG.md

@@ -45,6 +45,8 @@ All notable changes to this project will be documented in this file.
   - `smartcontract`'s `test-sbf` target runs from each program's directory, the way `build-programs` already does, instead of once from `smartcontract/`. An unscoped `cargo test-sbf` resolves the whole workspace against the platform-tools rustc, which reports itself as 1.89.0-dev, and the workspace now carries crates declaring a higher minimum: `aws-sdk-s3` at 1.94.1 and `rustler` at 1.91, both reached through the offchain crates and neither in any program's dependency graph. Serviceability runs before telemetry, whose test helper loads the serviceability `.so` from `target/deploy`.
   - `smartcontract`'s `test-sbf` target names its four program packages instead of running unscoped. An unscoped `cargo test-sbf` resolves the whole workspace against the platform-tools rustc (1.89.0-dev), and the workspace now carries crates declaring a higher minimum, `aws-sdk-s3` at 1.94.1 and `rustler` at 1.91, both reached through the offchain crates. Neither is in any program's dependency graph. The sibling `test-programs` and `lint-programs` targets were already package-scoped, which is why only this one failed.
   - The imported `offchain/` tree catches up with the three pull requests that landed in `doublezero-offchain` after the import point: `doublezero-solana shreds pay` is removed (`withdraw`, `list`, `payments` and `price` stay), the fund-seat instruction is removed from the offchain Solana SDK while `shreds payments` keeps reading leftover fund-seat transactions, and the solana-cli crate moves to 0.5.12. Author, date and message come across unchanged, with the pull request references named the way the import named its own. `solana/` needed no sync: its upstream tip is the imported tip.
+  - `offchain/CONTRIBUTING.md` is removed and its code of conduct moves to the root README. It told contributors to fork `doublezero-offchain` and open pull requests and issues there, which stops being true when that repository is archived, and the rest of it duplicated the root's contributing guidance.
+  - DEVELOPMENT gains a section on the two imported trees, naming the parts the root `make` targets do not cover: the Solana L1 programs, which keep their own workspace and toolchain, and the Elixir scheduler.
 
 ## [v0.38.0](https://github.com/malbeclabs/doublezero/compare/client/v0.37.0...client/v0.38.0) - 2026-08-28
 

DEVELOPMENT.md

@@ -20,6 +20,25 @@ make fmt
 make ci
 ```
 
+## The imported trees
+
+`offchain/` and `solana/` came from `doublezero-offchain` and `doublezero-solana`.
+The offchain Rust crates are ordinary members of the root workspace, so the
+Quickstart targets above cover them. Two parts are not covered:
+
+```bash
+# The Solana L1 programs keep their own workspace, lockfile and 1.91 toolchain,
+# so nothing at the root builds them. Their program bytes have to stay
+# reproducible against solana/programs/sha256sums_*.txt, which is why they are
+# held out.
+cd solana && make lint && make test-lib && make test-sbf
+
+# The offchain scheduler is Elixir. Run the same checks as `.github/workflows/elixir.yml`.
+cd offchain/scheduler && mix deps.get && mix format --check-formatted && mix compile --warnings-as-errors && mix credo --strict && mix test --cover
+```
+
+Both have their own CI workflows (`solana`, `elixir`), path-scoped to their trees.
+
 ## Local end-to-end testing
 
 The local devnet and end-to-end test environments both run entirely in Docker containers.

README.md

@@ -20,6 +20,10 @@ make ci
 
 For coding standards, local test instructions, and devnet usage, refer to [DEVELOPMENT](./DEVELOPMENT.md).
 
+This project is intended to be a safe, welcoming space for collaboration, and
+contributors are expected to adhere to the [Contributor Covenant Code of
+Conduct](https://www.contributor-covenant.org/).
+
 ## License
 
 Licensed under the **Apache License 2.0**.