Bump version to 1.0.0 (#197)

First stable release. Since v0.19.0, observ has had a broad performance
overhaul, gained full type-hint coverage and a new trigger_ref API, and
picked up a documentation site.

New features
- trigger_ref(): force-notify the watchers of a proxy, mirroring Vue's
  triggerRef (#188, closes #123).
- Fully typed: modern type hints throughout, a py.typed marker, and ty
  type-checking enforced in CI (#185, #184, closes #114).

Performance
- Reworked deep-watch traversal: plain leaf values are filtered out of the
  traverse stack at push time and raw targets are traversed directly.
  Traversing large flat/shallow structures is up to ~85% faster (#190).
- Lower per-operation trap overhead and proxies constructed with positional
  flags: reactive reads/writes and proxy creation are ~35-50% faster
  (#192, #193).
- proxy_db lifetimes are managed by reference counting instead of a gc hook,
  eliminating reference cycles and making cleanup deterministic (#177).
- Scheduler and dependency-bookkeeping micro-optimizations: in-place bisect
  insertion (#191), single-read/write flush counting (#196), a set
  difference in cleanup_deps (#194), and reading the arg count off the code
  object in weak() (#195).

Correctness
- Guarantees, with tests, that observ creates no reference cycles (#189).

Documentation
- New MkDocs site published to GitHub Pages (#176), with an Internals
  section (#179) and a rewritten README (#180).

Tooling
- Modernized CI workflows (#182) and a more robust benchmark guard
  (#181, #187).

Author: berendkleinhaneveld

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "observ"
-version = "0.19.0"
+version = "1.0.0"
 description = "Reactive state management for Python"
 authors = [
     { name = "Korijn van Golen", email = "korijn@gmail.com" },