app: increment halt counter

penumbra: update `COMPATIBILTIY.md`

app: increment `APP_VERSION`

add docstring comment for APP_VERSION

COMPATIBILITY.md

@@ -1,3 +1,4 @@
 | Application version (Name)| Penumbra crate version | CometBFT | Protobuf |
 | ------------------------- | ---------------------- | -------- | -------- |
-| 1 (Testnet 69)            | v0.69.1                | v0.37.5  | v1       |
+| 1 (Testnet 70)            | v0.70.x                | v0.37.5  |   v1     |
+| 2 (Testnet 71)            | v0.71.x                | v0.37.5  |   v1     |

crates/core/app/src/app/mod.rs

@@ -619,7 +619,7 @@ impl App {
 ///
 /// Increment this manually after fixing the root cause for a chain halt: updated nodes will then be
 /// able to proceed past the block height of the halt.
-const TOTAL_HALT_COUNT: u64 = 0;
+const TOTAL_HALT_COUNT: u64 = 1;
 
 #[async_trait]
 pub trait StateReadExt: StateRead {

crates/core/app/src/lib.rs

@@ -19,7 +19,9 @@ pub use crate::{
 
 use once_cell::sync::Lazy;
 
-pub const APP_VERSION: u64 = 1;
+/// Representation of the Penumbra application version. Notably, this is distinct
+/// from the crate version(s). This number should only ever be incremented.
+pub const APP_VERSION: u64 = 2;
 
 pub static SUBSTORE_PREFIXES: Lazy<Vec<String>> = Lazy::new(|| {
     vec![