fix/batch-2026-03-28

[thomasluizon]

Combined Changes

This PR bundles the following worktree branches:

• feature/flexible-skip-logic (1 commit) - Flexible habit skip records log with Value=0 and reduces period target instead of advancing DueDate past window

Changes

• Habit.SkipFlexible() creates a HabitLog with Value=0
• HabitScheduleService subtracts skips from period target
• GetHabitScheduleQuery returns adjusted flexibleTarget
• Skip commands (single, bulk, AI chat) use new approach for flexible habits
• Metrics/retrospective exclude skip logs from calculations
• Fixed pre-existing bug in BulkSkipHabitsTool (used AdvanceDueDate instead of AdvanceDueDatePastWindow)

Test Plan

• Skip a flexible habit (e.g. 3x/week), verify target reduces to 2
• Skip all remaining, verify habit disappears from schedule
• Log + skip in same window, verify counts are correct
• Verify non-flexible habits still use AdvanceDueDate
• Verify metrics exclude skip logs from streaks

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