Update Credential-System.md and RDS-Rust-Workspace.md to describe a
provider-neutral PostgreSQL backend instead of AWS RDS. Replace IAM
auth examples with standard libpq env-var connection. Remove the
~/.aws/ file layout and AWS hostname defaults.
- Add ene-node, ene-rds-chat, ene-rds-ephemeral, ene-rds-wiki,
ene-storage, ene-sync crates to the ene-rds workspace
- Extend ene-rds-core with shared types and cluster messaging
- Add review doc and wiki page for the RDS Rust workspace
- Fix devcontainer: custom /etc/passwd with researcher user,
add gcc/glibc/binutils for VS Code server compatibility,
include util-linux, gnutar, gzip; add LD_LIBRARY_PATH
- Ignore Nix build output (`result`) and Rust artifacts
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