chore: release v0.17.1 (#2359)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Documentation and version metadata only; no application code changes
in this PR.
> 
> **Overview**
> **Release v0.17.1** — bumps the shipped version from `0.17.1-rc1` to
**`0.17.1`** in `VERSION` and finalizes the changelog by renaming the
**Unreleased** section to **0.17.1** (no new changelog entries in this
diff).
> 
> The **0.17.1** notes already documented there cover **`terrmate ui`**
promote-list filtering for bundles with missing target-environment
dependencies, and bundle **`lets`** blocks with `bundle.let.<name>`
references after inputs and before exports/stacks.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
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Author: snakster

CHANGELOG.md

@@ -20,7 +20,7 @@ Given a version number `MAJOR.MINOR.PATCH`, we increment the:
 - Backward compatibility in versions `0.0.z` is **not guaranteed** when `z` is increased.
 - Backward compatibility in versions `0.y.z` is **not guaranteed** when `y` is increased.
 
-## Unreleased
+## 0.17.1
 
 ### Added
 

VERSION

@@ -1 +1 @@
-0.17.1-rc1
+0.17.1