fix: revert androidx-lifecycle 2.10.0 — it broke the iOS demo build

[vietnguyentuan2019]

What happened

I merged #55 (androidx-lifecycle 2.8.4 → 2.10.0) on the basis that its only red checks matched two known-benign patterns. That was wrong: the bump breaks :composeApp:compileKotlinIosSimulatorArm64 on main right now.

w: KLIB resolver: Skipping '…/lifecycle-viewmodel-compose-uikitSimArm64Main-2.10.0.klib'
   having incompatible ABI version '2.2.0'. The library was produced by '2.2.20' compiler.
e: KLIB resolver: Could not find '…lifecycle-viewmodel-compose-uikitSimArm64Main-2.10.0.klib'
> Task :composeApp:compileKotlinIosSimulatorArm64 FAILED

This is the same klib-ABI failure that got kotlinx-coroutines 1.11.0 (#53) and Koin 4.2.1 (#54) closed unmerged. androidx-lifecycle 2.10.0 ships Kotlin/Native klibs built with Kotlin 2.2.20; this project is pinned to 2.1.21.

Verified by checking out main at fcc6faa with no other changes and compiling — it fails there too, so this is not an artifact of any in-flight work.

Why CI didn't catch it

Nothing in CI compiles the demo app for a Kotlin/Native target:

• :composeApp:assembleDebug — Android only.
• :kmpworker:linkReleaseFrameworkIosSimulatorArm64 — the library, not composeApp.
• The iOS tests jobs run :kmpworker:iosSimulatorArm64Test / :kmpworker-http:….

So every job on #55 was legitimately green while the iOS demo build was broken. Same shape as #88 (nothing ran testReleaseUnitTest): a target that exists but is never exercised.

Fix

1. Revert androidx-lifecycle to 2.8.4. Verified :composeApp:compileKotlinIosSimulatorArm64 passes again.
2. Add :composeApp:compileKotlinIosSimulatorArm64 to the demo-builds job so this class of breakage can't pass CI again.
3. Extend the dependabot ignore list to every dependency that publishes klibs (coroutines, jetbrains-androidx lifecycle, compose, koin) — a minor bump of any of them carries the building compiler's ABI stamp, so they must move with the Kotlin toolchain rather than on their own schedule. This is what would have stopped build(deps): bump the coroutines group across 1 directory with 3 updates #53/chore(deps): bump koin from 4.0.0 to 4.2.1 #54/chore(deps): bump androidx-lifecycle from 2.8.4 to 2.10.0 #55 from ever being opened.