v1.9.25: Rename CustomProvider to BashProvider

Highlights

• Renamed the shell-command provider from CustomProvider / custom to BashProvider / bash.
• Renamed the provider module to abx_pkg.binprovider_bash, updated lazy exports/imports, and switched the managed-root config from ABX_PKG_CUSTOM_ROOT to ABX_PKG_BASH_ROOT.
• Renamed provider-specific fields and exported shell env vars to bash_root, bash_bin_dir, BASH_INSTALL_ROOT, and BASH_BIN_DIR.

Behavior

• Preserved the existing shell-command install/update/uninstall model while keeping install_root and bin_dir aliases working for the renamed provider.
• Updated the provider lifecycle and security-control tests to exercise the renamed bash provider end to end.
• Fixed Puppeteer's internal installer binary naming to puppeteer-browsers so the documented/provider-facing name matches the actual binary being bootstrapped.

Documentation

• Refreshed the README provider list and binprovider sections so the security-option docs match the current implementation.
• Added and corrected documentation for bash, chromewebstore, and puppeteer, including provider defaults, env-backed security controls, and unsupported-option warning behavior.

Upgrade notes

• Replace CustomProvider imports with BashProvider.
• Replace provider name custom with bash in Binary.overrides and any serialized config.
• Replace custom_root / custom_bin_dir with bash_root / bash_bin_dir.
• Replace ABX_PKG_CUSTOM_ROOT with ABX_PKG_BASH_ROOT.