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Finder menu selection dispatch

Baseline: TortoiseGit 7338078f8ddd924b8cddee35f512f2286072136d. This ports retained menu selection for existing commands; full shell menu classification, native activation and signed handoff remain pending.

ContextMenu.cpp (0b31f963e73ff71cd9cdb0861972a671236ae20f) invokes commands with retained paths/folder. Commit, Revert and Ignore use those path lists rather than a new live Explorer selection. DiffLater reads Control at invocation to clear the comparison mark, while retaining the command's selected paths.

Every custom actionable Finder item now holds a FinderMenuCommand with an immutable FinderRequest: creation, ordinary repository commands, nested Ignore name/extension and marked comparison. Activation resolves that packet directly; it does not ask the Finder controller for a new selection or target. Menu items use the same paths for availability and dispatch. Container menus retain the targeted folder even when child files are selected. Item menus retain the selected files; targetless toolbar Clone/Create packets retain no paths and continue to use the native default/picker workflow.

Control still changes only DiffLater into Clear comparison mark at activation. The core request codec preserves selection order, deduplicates literal paths and encodes Unicode, newline and URL punctuation without delimiter guessing. No bookmark/security scope is captured: the containing app must still renew access, revalidate paths and check Git state before a mutation. A stale menu is not proof that its files or repository still exist.

The actual extension source's standalone Swift 6/macOS 13 receiver checks:

• Ordinary multi-file packets retain their paths after the test selection changes.
• Container packets retain the folder rather than its selected child.
• Nested Ignore packets retain the selected file and their distinct action.
• Comparison packets retain the file; Control clears only its mark command.
• A literal Unicode/newline/ampersand/question-mark filename and duplicate paths round-trip through the actual packet and core codec in order.
• Icon-on/off menu signatures now include the complete request URL, so those checks compare command and path routing as well as titles and enabled states.
• Existing folder/toolbar creation, six-case icon and cache checks still pass.

No Finder controller/extension/window is instantiated, no menu gesture is driven, and no URL is opened. Actual NSWorkspace activation, native dialogs, signed scope renewal, stale-file recovery and live Finder selection acceptance remain pending. Core code is unchanged in this follow-up; the prior 12-test request/creation/settings run passed before this change. Debug and unsigned AppStore builds, bundle audits and site generation are in the verification record.

Finder context now shares normalized selections, nearest repository ownership and explicit ignore inheritance; see selection context.