Fix yamlfmt Errors in Helm Chart

[noelcarl]

This addresses the failing yamlfmt check in the default github actions run:

- hook id: yamlfmt
- files were modified by this hook
pre-commit hook(s) made changes.
If you are seeing this message in CI, reproduce locally with: `pre-commit run --all-files`.
To run `pre-commit` as part of git workflow, use `pre-commit install`.
All changes made by hooks:
diff --git a/helm/agent/Chart.yaml b/helm/agent/Chart.yaml
index 7de5195..5142ec3 100644
--- a/helm/agent/Chart.yaml
+++ b/helm/agent/Chart.yaml
@@ -1,3 +1,4 @@
+---
 apiVersion: v2
 appVersion: v1.17.0
 description: A Helm chart for the Superblocks On-Prem Agent

(see https://github.com/superblocksteam/agent/actions/runs/12435981140/job/34722901608)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.96%. Comparing base (23df60d) to head (5a07d88).

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #298    +/-   ##
========================================
  Coverage   48.96%   48.96%            
========================================
  Files         307      307            
  Lines       34581    34581            
  Branches     1136     1307   +171     
========================================
  Hits        16934    16934            
+ Misses      17048    17042     -6     
- Partials      599      605     +6     

Flag	Coverage Δ
test-go	55.08% <ø> (ø)
test-js	43.58% <ø> (ø)
test-py	49.17% <ø> (ø)

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