Switch to yaml12 for YAML 1.2 compliant parsing

[Copilot]

The yaml package only supports YAML 1.1, requiring a workaround to correctly handle values like yes/no/Y/N as strings rather than booleans. The yaml12 package from posit-dev provides a proper YAML 1.2 parser backed by a Rust crate.

Changes

• DESCRIPTION: Replace yaml and purrr with yaml12 in Imports
• R/read_params.R: Replace the read_safe_yaml workaround (custom handlers + purrr::modify_tree) with a direct call to yaml12::read_yaml
• NAMESPACE: Update imports accordingly
• tests/testthat/test-read_params.R: Remove library(yaml) dependency and the write/re-parse quote-stripping dance; test directly against YAML 1.2 semantics

Before — complex workaround to coerce YAML 1.1 output into 1.2 behavior:

read_safe_yaml <- function(params_file) {
  yaml::read_yaml(params_file,
    handlers = list(
      "bool#yes" = \(x) { attr(x, "yaml_bool") <- TRUE; x },
      "bool#no"  = \(x) { attr(x, "yaml_bool") <- FALSE; x }
    )
  ) |>
    purrr::modify_tree(leaf = \(x) { ... })
}

After — direct YAML 1.2 parsing:

read_safe_yaml <- function(params_file) {
  yaml12::read_yaml(params_file)
}

With yaml12, yes/no/Y/N are plain strings and only true/false are booleans — correct YAML 1.2 behavior with no workaround needed.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• posit-dev.github.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)