ADFA-3604: Re-enable R8 shrinking with keep rules for kotlin-analysis-api (#1596)

* ADFA-3604: Re-enable R8 shrinking with keep rules for kotlin-analysis-api

Removes the blanket -dontshrink added in ADFA-996, which neutered R8
shrinking entirely after it broke release-build project init. Adds
targeted keep rules for every class the bundled kotlin-analysis-api jar
loads reflectively via IntelliJ plugin XML descriptors and
ServiceLoader entries, since those are the paths R8 can't trace from
bytecode reachability alone.

Cuts release dex from 119.4 MB / 104,033 classes to 28.8 MB / 24,853
classes in a trial build. Not yet verified on a physical device.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* ADFA-3604: Document keep-rule generation and regeneration procedure

Review feedback on #1596: the 352-entry keep-rule list had no documented
provenance. Adds the exact extraction/parsing steps used to generate it
and how to regenerate and diff it after a Kotlin Analysis API or
IntelliJ platform dependency bump.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

Author: davidschachterADFA

app/proguard-rules.pro

@@ -133,9 +133,6 @@
 -keep class io.sentry.** { *; }
 -dontwarn io.sentry.**
 
-## Prevent R8 from moving what it thinks as unused classes
--dontshrink
-
 ## Plugin SPI
 ## Plugins are loaded dynamically via DexClassLoader, so R8 cannot see their
 ## implementations of these interfaces. Without these rules, R8 narrows the