New Stuff

• nvm install --offline: install from cache without network access

Bug Fixes

• nvm_download_artifact: reject version strings with disallowed characters
• nvm_get_checksum: pass the tarball name to awk as data, not program text
• nvm_download: avoid eval so mirror-supplied version strings can't inject commands
• nvm_download: send a well-formed Authorization header on the wget path
• avoid an unbound variable
• Add local for sanitized_header (#3837)
• fix same owner for root when install from binary (#3834)
• nvm_normalize_lts: only reject uppercase for LTS names, not regular aliases
• install.sh: check mkdir return codes
• install.sh: fix POSIX compliance, printf format strings, and profile detection
• nvm which: show alias name in infinite loop error message
• nvm uninstall: fix alias cleanup glob expansion
• nvm debug: use default empty values for potentially unset variables
• nvm_iojs_version_has_solaris_binary: fix comparison to detect non-iojs versions
• nvm_download_artifact: fix error propagation from subshells
• nvm_install_binary: return failure when binary download fails with -b
• nvm_get_arch: only apply musl suffix on x64 Alpine
• nvm_get_arch: add command prefix to uname call
• nvm_resolve_local_alias: avoid using variable as printf format string
• nvm_get_mirror: fix awk URL validation to actually reject invalid URLs
• nvm_ls_remote_combined: propagate iojs remote listing failures
• nvm install: fix nvm err typo to nvm_err for -s/-b conflict
• nvm alias: fix colors not showing by default

Refactors

• nvm_rc_version: use fd 3 instead of exported env var for multiple return

Docs

• fix --offline help line alignment
• Clean up wording in docs and shell comments (#3806)
• fix CONTRIBUTING grammar (#3804)
• do not use tilde expansion in ENV of Dockerfile (#3821)
• [readme] use tilde expansion instead of "$HOME" for consistency (#3799)
• [readme] use "$HOME" instead of hardcoded "/home/user"
• [readme] Revise Node.js version usage examples (#3802)

Misc

• [meta] Update .gitmodules with relative submodule path (#3839)
• [meta] Submodule nvmrc update protocol from git to https (#3839)
• [meta] Align and enhance AGENTS.md instructions (#3774)

Tests

• install_nvm_from_git: stop git background gc/maintenance racing with cleanup
• install_nvm_from_git: fix malformed test command (missing space before ])
• reduce CI flakiness from transient Docker registry failures
• remove double-substitution in assert_ok and assert_not_ok (#3826)
• fix 4 test failures
• add try/try_err helpers; convert tests to use them
• [actions] add workflow to update nodejs.org nvm version
• [actions] set per-job permissions in the nvm install workflow
• [actions] allow DockerHub's CloudFront CDN so image pulls aren't blocked
• [actions] upgrade vampire/setup-wsl (#3775)