fix: editor split, stop flag in actions, write errors, history on failure, expect panic, string match

- src/main.rs: split VISUAL/EDITOR into prog+args, drop expect panic in reap_timer, propagate write_timer errors, check stop during actions, record history on partial failure, use const for stop msg
- Cargo.toml: add authors/homepage, bump noyalib 0.0.12->0.0.13
- release.yaml: tighten tag glob, fix curl 404 fallback, URI-encode asset name, upgrade upload-artifact v3->v4
- ci.yaml: add cargo cache step
- README.md: sync feature list, fix push to two-step
- RELEASING.md: clarify Cargo.lock regeneration

Cargo.lock

@@ -807,9 +807,9 @@ dependencies = [
 
 [[package]]
 name = "noyalib"
-version = "0.0.12"
+version = "0.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "903f06e76b14b388b47d651b9498b008888a9475084087e51c294731acbf16c1"
+checksum = "2095d0b3b6017ebbdaffedf83ffb2bff7e468ab379ac391239abea4880833290"
 dependencies = [
  "indexmap",
  "itoa",