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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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