Update Asana goal metrics with a status that explains them

**Objective:** Record `{new-value}` as the current metric value of the Asana goal `{goal-name}`, then post a goal status update that explains the change, with `{note}` as the user's own context if given.

**Step 1: Find the goal**

Call `asana-get-goal` with `name` set to `{goal-name}`, or `name.contains` if nothing matches exactly. If none or more than one goal matches, list them (name, owner, time period) and stop. Record the `goal-id`, `metric-current-value`, `metric-target-value`, `metric-unit`, status and time period.

**Step 2: Check the change**

* If the goal has no metric (no target value), say so and stop: `asana-update-goal-metric` sets a value on an existing metric, and setting one up is a separate decision.
* Confirm `{new-value}` is a number. Show the old value, the new value, the target, and the percent progress before and after.
* If the new value moves progress backwards, or jumps by more than half the distance to target in one step, point that out.

**Step 3: Draft the status update**

Call `asana-get-status-updates` with `parent-id` set to the goal id to read the most recent update. Draft a new one: a status of on_track, at_risk or off_track, a short title, and plain text stating the new value against target and the reason, using `{note}` where given. Do not invent reasons the user did not provide.

Show the metric change and the draft together, and ask the user to approve both, approve only the metric change, or cancel.

**Step 4: Write, only on approval**

* On approval, call `asana-update-goal-metric` once with `goal-id` and `current-number-value` set to `{new-value}`.
* If the status update was approved too, then call `asana-create-status-for-goal` once with `goal-id`, `status`, `title` and `text`.
* Report what was written and its returned id.

**Rules & Guidelines:**

* The only write tools allowed are `asana-update-goal-metric` and `asana-create-status-for-goal`, each at most once, after explicit approval. Do not call `asana-update-goal`, `asana-create-goal-metric`, `asana-create-comment-for-goal` or any other write tool.
* If the metric update fails, do not post the status update.

**Validation:**

* If `{new-value}` is empty or not a number, ask for it and stop.