feat(android): digest and compaction chips (phase 0 receipts)

[aivsomkar]

Android twin of #1245, stacked on #1243 (phase 0 part 2), which introduces the two message kinds this renders.

What changes

• Message.Kind gains DIGEST and COMPACTION; Message gains digest: WorkDigest? and compaction: Compaction? with the fields the chip counts from. Unknown keys stay ignored, so a newer digest never fails the decode.
• Chat: a quiet ReceiptChip under the reply, "4 tool calls · 2 files" or "Context compacted · 12,345 tokens summarised", tap to expand the full text. Copy gives the full text.
• Hidden together with tool activity (isActivityReceipt), never folded into a run of it. Roster preview and the updates line use the chip text.

Test plan

• DecodingTest: digest counts, digest without files, compaction record (chip text)
• ChatPreferencesTest: hidden drops the receipts, reduced keeps a digest as its own row and breaks the run
• NOT compiled on the authoring Mac (no Java runtime there); this PR's CI runs :core:test and :app:testDebugUnitTest and builds both APKs. Please treat a red CI as mine to fix.
• not run: on-device look (android/README.md)

Platforms

Platform	Applies?	Status
macOS	n/a	phone-only change
Windows	n/a	phone-only change
iOS	yes	#1245 (twin)
Android	yes	in this PR; NOT compiled locally, CI compiles it
Companion	n/a	no route changed; the phone reads the kinds off the existing messages route

🤖 Generated with Claude Code

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
openmausbot-docs	Ready	Preview	Sep 15, 2026 3:30pm UTC

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: a9c2b2d5-68ce-4553-88e7-23bb4f8dd254

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}