chore(main): release 1.303.0

[newrelic-browser-agent-team]

When this PR is merged, a new tagged release will be created with the notes below.

1.303.0 (2025-11-06)

Features

• Add custom event support to register API (#1606) (4137dcb)
• SMs for browser connect response (#1611) (29f5bdf)

Bug Fixes

• memoize promise context propagation to avoid safari hangs (#1597) (23cb559)
• Obfuscate custom attributes for logs added after PVE (#1622) (f648e3f)

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[github-actions]

Supportability Metric Usage Changes:

No matching changes found

Supportability Metrics .md File Changes:

supportability_metrics.md was changed? false

New supportability metrics require changes to supportability_metrics.md, as well as a new PR to Angler. Please ensure an Angler PR is created and linked to this PR.

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	25.96 kB / 9.8 kB (gzip)	25.96 kB / 9.8 kB (gzip)	0% / 0.01% (gzip)
lite	async-chunk	53.84 kB / 18.05 kB (gzip)	53.84 kB / 18.05 kB (gzip)	0% / 0% (gzip)
pro	loader	54.47 kB / 19.25 kB (gzip)	54.47 kB / 19.25 kB (gzip)	0% / 0.01% (gzip)
pro	async-chunk	92.5 kB / 29 kB (gzip)	92.57 kB / 29.01 kB (gzip)	0.08% / 0.03% (gzip)
spa	loader	63.32 kB / 21.94 kB (gzip)	63.32 kB / 21.94 kB (gzip)	0% / 0% (gzip)
spa	async-chunk	117.9 kB / 36.32 kB (gzip)	117.98 kB / 36.32 kB (gzip)	0.06% / 0.01% (gzip)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.47%. Comparing base (f648e3f) to head (c70fe43).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1619   +/-   ##
=======================================
  Coverage   88.47%   88.47%           
=======================================
  Files         206      206           
  Lines        7763     7763           
  Branches     1593     1593           
=======================================
  Hits         6868     6868           
  Misses        782      782           
  Partials      113      113           

Flag	Coverage Δ
unit-tests	81.72% <ø> (ø)

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