chore: remove unused Phabricator config

[nickolas-dimitrakas]

Why

The repository still carries a configuration file for a code review tool the project stopped using years ago. It does nothing today, but it points readers and tools at a review process that no longer exists. Once this lands, that stale file is gone, so nothing in the repository points at the old review process.

Programme

Standalone change, no programme.

What changes

Before: the repository root has .arcconfig, a Phabricator configuration file. After: the file is gone. Nothing in the repository reads or references it, so no source, build, test or release file changes. The changelog is not edited, because nothing that ships in the SDK changes.

Linked work

None.

Rollout

Nothing changes in production; if this is wrong, revert the pull request.

Risks

• Someone still relies on the file for local tooling; nothing in the repository references it and the tool it configures is no longer used; we would see a question on this pull request or an issue.

Risk class: low.

Who

Written by: an automated coding agent, at a maintainer's request.
Code reviewed before opening: no one.
Design reviewed before opening: no one.
Decision this implements: a maintainer's request to remove unused tooling configuration.
Checked: a search of the repository for references to .arcconfig, outside the file itself, found none.
Not checked: an IDE or Gradle run, since no build input changes.

Size

Hand-written: 4 lines removed in 1 file.
Generated: none

[github-actions]

Kotlin migration progress

No change to the Java left to convert.

Module	Kotlin LOC	Java LOC	Java staying (facade)	Java left to convert	Kotlin share
android-core	3,249	22,690	9,716	12,974	12.5%
android-kit-base	601	5,405	1,651	3,754	10.0%
Total	3,850	28,095	11,367	16,728	12.1%

Conversion progress: 0.0% (16,728 of 16,550 baseline Java LOC left to convert). 132 Java files and 36 Kotlin files in scope.

[github-actions]

Binary compatibility

• ✅ android-core is compatible with 6.1.9 (115 classes compared, 0 with additions only).
• ✅ android-kit-base is compatible with 6.1.9 (44 classes compared, 0 with additions only).

Compares the release AAR against the same artifact at the last version published to Maven Central; R8-renamed classes and members are excluded (see the script docstring). Full japicmp HTML/XML reports are attached as the api-compat-reports workflow artifact. This check is not in the required-check set yet, so a red result here does not block merging.

[github-actions]

📦 SDK Size Impact Report

What the SDK adds to a minified release APK.

mParticle Core SDK

Measured against an empty baseline app. Unlike the Rokt kit, android-core ships no Compose and no resources, so there is nothing here that a host app would already provide.

Metric	Target branch	This PR	Change
APK size	120.63 KB	120.63 KB	+1 bytes
Download size	118.45 KB	118.44 KB	-3 bytes
Dex bytes	215.25 KB	215.25 KB	0 bytes

mParticle Core + Rokt kit

Measured against a Compose + Material3 reference app, so these are the costs on top of an app that already ships Compose. The reference app's dependencies are a documented convention, not a measured average: see size-report-rokt/README.md.

Metric	Target branch	This PR	Change
APK size	1.26 MB	1.26 MB	0 bytes
Download size	1.25 MB	1.25 MB	+1 bytes
Dex bytes	2.23 MB	2.23 MB	0 bytes

Rokt SDK+ umbrella (adds the payment extension)

Metric	Target branch	This PR	Change	On top of mParticle Core + Rokt kit
APK size	6.55 MB	6.55 MB	0 bytes	+5.29 MB
Download size	6.43 MB	6.43 MB	+1 bytes	+5.19 MB
Dex bytes	7.12 MB	7.12 MB	0 bytes	+4.88 MB

➡️ SDK size impact change is minimal.

Raw measurements

core, Target branch:

{"baseline_dex_bytes": 0, "baseline_download_bytes": 2508, "baseline_install_bytes": 7525, "core_dex_bytes": 220412, "core_download_bytes": 123798, "core_install_bytes": 131048}

core, This PR:

{"baseline_dex_bytes": 0, "baseline_download_bytes": 2515, "baseline_install_bytes": 7531, "core_dex_bytes": 220412, "core_download_bytes": 123802, "core_install_bytes": 131055}

rokt, Target branch:

{"baseline_dex_bytes": 1829108, "baseline_download_bytes": 1240062, "baseline_install_bytes": 1300934, "kit_dex_bytes": 4170020, "kit_download_bytes": 2548122, "kit_install_bytes": 2623275, "sdkplus_dex_bytes": 9291568, "sdkplus_download_bytes": 7985699, "sdkplus_install_bytes": 8165359}

rokt, This PR:

{"baseline_dex_bytes": 1829108, "baseline_download_bytes": 1240062, "baseline_install_bytes": 1300934, "kit_dex_bytes": 4170020, "kit_download_bytes": 2548123, "kit_install_bytes": 2623275, "sdkplus_dex_bytes": 9291568, "sdkplus_download_bytes": 7985700, "sdkplus_install_bytes": 8165359}

_{Measured a51b464 merged into 5d8ddf3}