Shows have a category, not a tier

Tier said "how important" and the shows needed "what kind". Seven ordered
categories replace it: news, analysis, curiosity, sailing, true stories,
fiction, deep dives. The order is still the server's processing priority, so
one field carries both axes -- which is the idiosyncrasy docs/show-kinds.md
is written to watch, with four signs that a better abstraction has arrived.

All 42 known feeds are refiled by migration 20 -> 21, which rebuilds the
subscriptions table rather than renaming the column: RENAME COLUMN keeps the
old 'ordinary' DEFAULT and fails schema validation, and DROP COLUMN needs
SQLite 3.35 against minSdk 29's 3.28. The wire value for true stories is
"truestory", not "true", because SQLite reads an unquoted true in a DEFAULT
as the boolean and stores 1.

Schema 21 is a new exported JSON; migrate20To21RenamesTierAndRefilesTheKnownShows
covers it, and all 22 device migration tests pass.

The coverage exclusion for the settings composable follows the file's rename;
left pointing at TierSettingKt it read as a 0.6% drop. The remaining 0.08% is
the deletion of the covered tier-seeding code, taken as an exception.

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

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