Routine `gh aw upgrade` to refresh action SHAs, dispatcher skill files,
and pick up newer compiler defaults.

* Updates `github/gh-aw-actions/{setup,setup-cli}` from `v0.74.8` to
  `v0.79.6` (SHA-pinned).
* Refreshes `.github/aw/actions-lock.json`.
* Renames `.github/agents/agentic-workflows.agent.md` to
  `.github/agents/agentic-workflows.md` and adds the regenerated
  `.github/skills/agentic-workflows/SKILL.md` dispatcher skill.
* Recompiles `android-reviewer.lock.yml` and
  `nightly-fix-finder.lock.yml`.
* Frontmatter cleanup: adds `environment: copilot-pr-reviewer` to both
  `.md` sources so the agent jobs run under that GitHub Environment
  (matches the convention used in dotnet/java-interop#1460 and
  dotnet/android-tools#388). Hand-patched into the `detection` job in
  each `.lock.yml` to work around github/gh-aw#38900 (compiler does not
  propagate top-level `environment:` to the detection job in v0.79.6).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Bumps [external/Java.Interop](https://github.com/dotnet/java-interop) from `b881d21` to [`6820a9cb`](dotnet/java-interop@6820a9c).

## Java.Interop changes pulled in

- [`6820a9c`](dotnet/java-interop@6820a9c) [Java.Interop] Make JavaProxyObject.RegisterNativeMembers private again ([#1468](dotnet/java-interop#1468))
- [`a2159d7`](dotnet/java-interop@a2159d70) Remove NuGet dependency grouping from Dependabot config ([#1459](dotnet/java-interop#1459))
- [`a0ca676`](dotnet/java-interop@a0ca6760) [ci] Update agentic workflows to claude-opus-4.8 ([#1461](dotnet/java-interop#1461))
- [`6d8aef7`](dotnet/java-interop@6d8aef7b) Bump to dotnet/android-tools@1fb68b6 ([#1457](dotnet/java-interop#1457))
- [`cfca8ad`](dotnet/java-interop@cfca8ad) Upgrade gh-aw to v0.79.6 and recompile workflows ([#1460](dotnet/java-interop#1460))
- [`0104236`](dotnet/java-interop@0104236e) [JniValueManager] Make TryConstructPeer virtual ([#1456](dotnet/java-interop#1456))
- [`d7dbad5`](dotnet/java-interop@d7dbad5) Remove Java.Interop.Dynamic ([#1449](dotnet/java-interop#1449))
- [`0244c10`](dotnet/java-interop@0244c10) Split reflection-based JniTypeManager and JniValueManager behavior ([#1441](dotnet/java-interop#1441))
- [`9ca7064`](dotnet/java-interop@9ca7064) [Java.Interop] Remove legacy `NET` preprocessor paths ([#1451](dotnet/java-interop#1451))
- [`cd2fc12`](dotnet/java-interop@cd2fc12) Remove Java.Interop.GenericMarshaler ([#1450](dotnet/java-interop#1450))

See full diff in [compare view](dotnet/java-interop@b881d21...6820a9c).

## Changes in this PR (beyond the submodule bump)

The Java.Interop bump — particularly [#1441](dotnet/java-interop#1441) (split reflection-based `JniTypeManager` and `JniValueManager`) and [#1449](dotnet/java-interop#1449) (removal of `Java.Interop.Dynamic`) — required a number of follow-on changes in `dotnet/android`:

### Runtime / `Mono.Android`
- **Adapt Android runtime to Java.Interop reflection managers** — switch the `JavaInteropTypeManager` / `JavaInteropValueManager` hierarchy to the new reflection-based base types and update type/value manager construction to match.
- **Change base type of value managers and type managers** so the runtime composes correctly with the new Java.Interop split.
- **Suppress reflection manager trim warnings only** — narrow the existing trim suppressions so they apply to the reflection-only managers and don't hide other warnings.
- **Suppress IL2068 on `ManagedTypeManager.GetTypeForSimpleReference`** — annotate the entry point that legitimately requires reflection so trim analysis is satisfied.

### Tests / apkdescs
- **Regenerate `BuildReleaseArm64SimpleDotNet.MonoVM.apkdesc`** to track size changes from the Java.Interop bump.
- **Regenerate Simple `BuildReleaseArm64` apkdescs** (`MonoVM` + `NativeAOT`) from a `Release` SDK so they match what CI produces.
- **Update NativeAOT warning expectations** — `Mono.Android` now produces fewer trim/AOT warnings, so loosen the strict `4 Warning(s)` checks in `SupportedOSPlatformVersion` and `CheckSignApk` to `AssertHasAtMostWarnings (2)` (new helper in `AssertionExtensions`) and drop the `BuildHasTrimmerWarnings` data counts (`3 → 2`, `4 → 3`) accordingly.

### Merges
- Two merges from `origin/main` to keep the branch current and resolve a conflict in `Microsoft.Android.Sdk.TypeMap.Trimmable.targets`.

Co-authored-by: Simon Rozsival <simon@rozsival.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Jonathan Peppers <jonathan.peppers@microsoft.com>