chore(repo): add git-cliff config, sort deps, add rust-version

- Add cliff.toml with GitHub remote wiring, issue link parsers, and
  clean group names (no sort prefixes)
- Add rust-version = "1.87.0" and codegen-units = 1 to workspace
- Sort workspace.dependencies alphabetically; add notstrap path entry
- Add CLAUDE.md preflight block; reformat workspace table to 100-col
- Delete stale brainstorm artifacts and root HANDOFF.md

crates/notforge/Cargo.toml

@@ -18,9 +18,7 @@ name = "notforge"
 path = "src/main.rs"
 
 [dependencies]
-anyhow = { workspace = true }
 base64 = { workspace = true }
-clap   = { workspace = true }
 miette = { workspace = true }
 notcore = { workspace = true }
 serde  = { workspace = true }