📝 Prune the completed backlog items

Remove every done/cancelled item. Git history is the archive and each
item's rationale already lives in the README, in development/ or in a
released changelog entry; none was recorded only here, so no item had to
be rescued into development/ before it could go.

- drop the `v1.0:` and `Matcher:` projects too: their last open task is
  done, so those headers would stand empty
- summarise the change under `[Unreleased]` in the changelog

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- prune the completed items from the backlog; their rationale already lives in
+  the README, `development/` and the released changelog entries
+
 ## [0.8.2] - 2026-09-25
 
 - write the README's Synopsis and Examples sections

backlog.tasks

@@ -7,32 +7,8 @@ Backlog and tracking for tiny-pattern-ts. Managed in vscode-todotasks format.
 Setup:
 ☐ Split off template into separate package => pi --session 01a07dde-7050-7054-bb36-1606d7eb2bc3 @low
 
-v1.0:
-✔ API surface is stable and fully typed @done
-    ✔ Finalize public exports in `src/index.ts` @done
-    ✔ Document all exported types and functions @done
-    ✔ Add JSDoc for public APIs @done
-✔ Test coverage meets threshold @done
-    ✔ Achieve 100% branch coverage on `src/primitive-union.ts` @done
-    ✔ Achieve 100% branch coverage on `src/index.ts` @done
-
-Matcher:
-✔ when using a union type as a property, the current behavior of tagged union matcher is @done
-    to pass never to handler parameters
-    → new matcher function needed or can be fixed in tagged union matcher
-    ✔ optional discriminant (`{ type?: "x" }`) is the same hole: the boolean/nullish change now admits the `undefined` tag, so the factory accepts the key, but `Extract<T, Record<K, V>>` still passes `never` to both the `x` and `undefined` handlers @done
-
 Documentation:
-✔ Bring README.md back to its previous form — synopsis and examples restored, in the correct place @done
-    → previous section order: title, tagline, Synopsis, Description, Requirements, Examples, API, License, Contributing
-    → previous Examples order: literal/exhaustive, typeof, structural/discriminated unions, when, any
 ☐ Create `examples/` directory with runnable snippets
-✔ Add comparison section vs. other TS pattern-matching libs in Readme.md @done
-    ✔ Why do we do this? => exhaustiveness encoded type safe @done
-    ✔ Why this form? little syntax, data last, very small, autocomplete, strict typing in the handler; for more features use ts-pattern @done
-✔ Write migration guide for users coming from discriminated unions @done (9/24/2026, 10:21:17 PM)
-✔ Create backlog tasks for implementation @done (9/24/2026, 10:21:16 PM)
-✔ Validate code fences in Markdown (start with README.md) — compile the TypeScript examples against `src/` so the docs cannot drift from the API @done
 
 Maintenance:
 ☐ Serve CI coverage over a tiny self-hosted webserver (replace the zip artifact) @low