Exclude framework adapters from coverage

Peter's call. The gate had been overridden eight times running, every one a
class whose whole body is a call into ExoPlayer, Media3, Room, WorkManager or
Chaquopy -- none of which execute on the JVM.

The last few overrides were the argument for doing this. Pulling completion
decisions out of PlaybackService into tested classes lowered the number,
because the tested part was already counted and the glue it left behind was
counted too. Writing an instrumented test for a migration lowered it again,
because jacocoTestReport measures unit tests only. A metric that punishes both
of those is measuring how much Android glue the app contains, not how well its
logic is tested.

Same code, 65.04% -> 89.93%: 629 uncovered lines were adapters, 131 are real.
What is left is honest -- page-fetch coroutines that need the actual host, a
few data classes, and Room's Converters, which are plain Kotlin and genuinely
untested. A drop from here will mean something.

The list sits next to its reasoning in the build file, with the bar written
down: "cannot execute off a device", not "awkward to test". QueueRepository,
PlaybackAdvancer, EpisodeDownloader and ChapterFetcher all touch
framework-adjacent things and all stay measured.

Also added jacocoFullReport, which folds in instrumented coverage for when you
want the fuller picture with a device attached. The commit gate deliberately
does not read it: device data only exists after a device run, so including it
would make the gate report different numbers for identical code depending on
whether one happened recently -- worse than a narrow gate.

One trap worth recording: Kotlin block comments nest. A KDoc mentioning a glob
with `/*` in it opened a nested comment, so the closing `*/` only closed the
inner one and the comment ran on until it hit a `*/` inside a later string
literal -- producing syntax errors on innocent lines well below the real cause.

No behaviour change. 425 unit tests green, detekt and lint clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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