depguard 0.2.0

Bug fixes

• dep_diff() now detects upgrades and downgrades of packages that are loaded in the running session. Version 0.1.0 compared the loaded version, which does not change until R restarts, so the headline dep_snapshot() -> install.packages() -> dep_diff() workflow reported “no changes” for exactly the packages it was meant to protect. Comparison is now on the on-disk version, and a loaded package whose running version no longer matches disk is flagged (session_stale).
• dep_check() is now genuinely offline by default. It previously called tools::package_dependencies() without a local database, which queried CRAN; with no internet the transitive tree came back empty and the check reported success. Dependencies are now resolved from installed metadata.
• Malformed lines in a text manifest containing {} no longer break the error message.
• Fixed a stray merge-conflict fragment in the vignette.

New features

• dep_check() verifies the version constraints that packages declare on each other (Imports: cli (>= 3.4.0)), not just that transitive dependencies are installed, so real conflicts are caught. New columns loaded and reason; new status "restart"; stop_on_problem for scripts and CI; check_cran = TRUE now adds cran_latest and outdated and fails gracefully offline.
• Manifests accept operators: ">= 1.2", "== 1.2.3", "< 2.0", "!= 1.0". A bare version still means “at least”, so existing manifests keep working.
• Manifests can be human-readable text files (any extension other than .rds), convenient for version control.
• dep_manifest_freeze() pins the packages you are using now.
• dep_snapshot() records every installed package by default (scope = "all"), can be saved with path, and dep_diff() accepts a snapshot, a file path, or nothing (the latest snapshot). Saved snapshots survive the session restart that hosted notebooks require after installs.
• dep_env() detects Kaggle, Colab, Binder, RStudio and plain desktop sessions and reports writable libraries. Restart advice in messages is tailored to the platform.
• dep_libraries() finds packages shadowed by a different version in another library.
• dep_healthcheck() now reports the environment and shadowed packages.
• dep_fix() gains lib, dry_run and method = "archive", a base-R backend that needs neither pak nor remotes. It verifies the result and warns if a restart is needed or if an earlier library hides the new copy.

Breaking changes

• The depguard_snapshot structure changed (packages now has columns disk_version, library, loaded_version); snapshots saved by 0.1.0 cannot be diffed.
• dep_check() results have two extra columns and the class depguard_check (still a data frame); the required column shows the operator form (e.g. ">= 1.1.4").
• sessioninfo is no longer imported.
• dep_check() prints the summary of problems; printing the result shows only problem rows (print(x, all = TRUE) for everything).

depguard 0.1.0

• Initial CRAN release.