feat: upgrade to node 24 + migrate to bun

[LouisBrunner]

No description provided.

[github-actions]

Smart Diff (Fails): Failure

Expected tolerance same but got worse instead

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[github-actions]

Smart Diff (Works (sticky)): Success

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--- fixtures/file1_basic.txt
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[github-actions]

Smart Diff (Works): Success

Check succeeded with tolerance better (expected same or better)

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file4_added.txt
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+E

[github-actions]

Smart Diff (Fails (sticky)): Failure

Expected tolerance same but got worse instead

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file2_deleted.txt
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[Copilot]

Pull request overview

Upgrades the GitHub Action’s runtime/tooling toward Node 24 and switches the project build/test workflow from npm/Jest/ncc to Bun + Biome 2.

Changes:

• Migrate CI to Bun (install, test, pack) and replace ncc packaging with bun build generating dist/index.js
• Update Action metadata to run on node24 and modernize dependency versions / Biome configuration
• Add a workflow to maintain “aggregate” tags (e.g., v1 pointing to latest v1.x)

Reviewed changes

Copilot reviewed 10 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/processing.ts	Reorders returned fields and ensures diff output is included in the result object.
src/notifications.ts	Refactors GitHub Actions context typing/import and reorders API payload fields.
src/inputs.ts	Reorders object literal fields for notifications and returned args.
package.json	Switches scripts/tooling to Bun; updates dependencies and removes Jest/ncc.
biome.json	Updates to Biome v2 schema/config and excludes dist/index.js from formatting/linting.
action.yml	Updates action metadata formatting and runtime to node24.
tests/main.test.ts	Adapts tests for new build artifact location and minor refactors.
.github/workflows/update-tags.yaml	Adds a tagging workflow to update major/minor aggregate tags.
.github/workflows/build.yml	Replaces setup-node/npm with setup-bun/bun commands.
.github/dependabot.yaml	Updates formatting and switches dependency ecosystem monitoring to Bun.

Comments suppressed due to low confidence (1)

tests/main.test.ts:1

• The test harness asserts outputs via ::set-output, which is deprecated and not how outputs are produced on actual runners when GITHUB_OUTPUT is set (file-based). Consider updating the tests to point process.env.GITHUB_OUTPUT to a temp file and assert by reading/parsing that file, so tests match real GitHub Actions behavior more closely.`

import * as cp from "node:child_process";

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[github-actions]

Smart Diff (Fails): Failure

Expected tolerance same but got worse instead

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file2_deleted.txt
@@ -1,4 +1,3 @@
 A
-B
 C
 D

[github-actions]

Smart Diff (Works): Success

Check succeeded with tolerance better (expected same or better)

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file4_added.txt
@@ -1,4 +1,5 @@
 A
 B
 C
 D
+E

[github-actions]

Smart Diff (Works): Success

Check succeeded with tolerance better (expected same or better)

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file4_added.txt
@@ -1,4 +1,5 @@
 A
 B
 C
 D
+E

[github-actions]

Smart Diff (Fails): Failure

Expected tolerance same but got worse instead

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file2_deleted.txt
@@ -1,4 +1,3 @@
 A
-B
 C
 D

[github-actions]

Smart Diff (Works): Success

Check succeeded with tolerance better (expected same or better)

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file4_added.txt
@@ -1,4 +1,5 @@
 A
 B
 C
 D
+E

[github-actions]

Smart Diff (Fails): Failure

Expected tolerance same but got worse instead

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file2_deleted.txt
@@ -1,4 +1,3 @@
 A
-B
 C
 D

[github-actions]

Smart Diff (Fails): Failure

Expected tolerance same but got worse instead

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file2_deleted.txt
@@ -1,4 +1,3 @@
 A
-B
 C
 D

[github-actions]

Smart Diff (Works): Success

Check succeeded with tolerance better (expected same or better)

===================================================================
--- fixtures/file1_basic.txt
+++ fixtures/file4_added.txt
@@ -1,4 +1,5 @@
 A
 B
 C
 D
+E

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud