Archive dormant Bitly links without losing live ones

**Objective:** Archive the bitlinks in `{group-name}` (default: all groups) that have had no clicks in the last `{lookback-days}` days (default 180), after the user confirms the list.

**Step 1: Find candidates**

* Call `bitly-get-bitlink` with `archived` = false, and `group-name` when given. Drop links created inside the lookback window.
* Call `bitly-get-click-day` with `archived-link` = false, `date.from` = today minus `{lookback-days}` days, `date.to` = today, and `group-name` when given.
* A link from the first call with no clicks in the second is a candidate.

**Step 2: Confirm**

Show the candidates as a numbered table: link, title, long-url, tags, created-date. Ask the user which to archive (all, none, or a list of numbers). Do not proceed without an explicit answer.

**Step 3: Archive**

For each confirmed link, call `bitly-update-bitlink` once with `id` set to that row's `bitlink-id` and `archived` = true. Do not pass `title`, `tags` or `long-url`.

**Step 4: Confirm the result**

Call `bitly-get-bitlink` with `archived` = true and `link` for each archived link, and report which succeeded and which failed (with the error).

**Rules & Guidelines:**

* `bitly-update-bitlink` is the only write allowed, only with `archived` = true, and only on links the user confirmed in Step 2.
* Never call `bitly-add-bitlink`.
* Archiving does not stop a short link redirecting, but it hides the link from the default views and reports. Tell the user this before they confirm.
* Never archive on a truncated read: if either read hits `max-records`, raise it and read again first.

**Validation:**

* If there are no candidates, say so and stop without writing anything.
* If the user's selection is unclear, ask again rather than guess.