[FEATURE] Reorder tasks in TaskList (insert before/after, move)

Problem

TaskCreate always appends to the end of the task list, and TaskUpdate doesn't expose a way to change a task's position. When I want a newly-created task to be sequenced before an existing one (e.g. "this should be done before task #N"), the only options are:

• Create the task and rely on the description to communicate ordering, or
• Delete and re-create downstream tasks in the desired order.

Neither is great. Description-based ordering is fragile (the assistant has to remember to honor it); recreating tasks loses history and IDs.

Proposal

Either:

1. Add an optional insertBefore / insertAfter parameter to TaskCreate taking an existing task ID, or
2. Add a position field (or equivalent) to TaskUpdate so tasks can be moved.

A move operation that takes (taskId, beforeId) would also work.

Why

The dependency fields (blocks/blockedBy) express logical ordering but not display ordering, and not every "do this before that" relationship is a hard dependency — sometimes it's just a priority preference.

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