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dependency logic
Add the `depends` (why) and `prohibits` (why-not) commands that query
the dependency graph to answer "which packages require X?" and "which
packages prevent version Y of X from being installed?" respectively.
Introduces the shared `dependency` module with package loading from
lock file or installed.json, forward/inverted dependency graph walking,
recursive traversal with cycle detection, and table/tree output formatters.
Adds `conflict` field to LockedPackage for conflict-based prohibition
detection, updating all struct literals across install, remove, require,
and update test helpers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Add full update command supporting --lock (content-hash refresh only),
--dry-run, --no-install, --no-dev, --prefer-stable, --prefer-lowest,
and partial updates (named packages). Extract install_from_lock() from
install.rs for shared use. Add Stability::parse() to package.rs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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