fix(ah-staking): stall detection grace period, MinerPages fix, and simulation tools

- Add 3-session grace period to stall detection to allow RC XCM round-trip
  before triggering era recovery (StallDetectionCount storage added)
- Fix plan_new_era() to always increment CurrentEra regardless of
  ElectionProvider::start() result, preventing infinite retry loops
- Fix MinerPages from 2 to 32 to match Pages config (was causing
  incomplete OCW solutions and election failures)
- Bump AH spec_version to 1_020_007
- Add subxt example scripts for simulation and mainnet operations
- Remove obsolete fix_force_era.rs (replaced by sim_reset_election.rs)

pezcumulus/teyrchains/runtimes/assets/asset-hub-pezkuwichain/src/lib.rs

@@ -138,7 +138,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: alloc::borrow::Cow::Borrowed("asset-hub-pezkuwichain"),
 	impl_name: alloc::borrow::Cow::Borrowed("asset-hub-pezkuwichain"),
 	authoring_version: 1,
-	spec_version: 1_020_006,
+	spec_version: 1_020_007,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 16,

pezcumulus/teyrchains/runtimes/assets/asset-hub-pezkuwichain/src/staking.rs

@@ -171,7 +171,7 @@ parameter_types! {
 	pub MinerTxPriority: TransactionPriority = TransactionPriority::max_value() / 2;
 	/// Try and run the OCW miner 4 times during the unsigned phase.
 	pub OffchainRepeat: BlockNumber = UnsignedPhase::get() / 4;
-	pub storage MinerPages: u32 = 2;
+	pub storage MinerPages: u32 = 32;
 }
 
 impl multi_block::unsigned::Config for Runtime {