chore(release): bump workspace to v1.1.1 + CHANGELOG

- Workspace package version: 1.1.0 → 1.1.1 (patch under the
  post-1.0 expansion-phase carve-out in docs/versioning.md)
- Rhai SDK version: 1.1 → 1.2 — minor bump, additive only.
  New surfaces: kv::*, dead_letters::*, ctx.event.
- Dashboard package version: 0.6.0 → 0.7.0 for the dead-letters UI.
- HTTP API version stays at 1 (additive: trigger CRUD, dead-letter
  admin endpoints, dispatch_mode field on routes).
- Schema version: 6 → 12 (migrations 0007–0012).

CHANGELOG.md created at the repo root following the convention from
prior bumps (release commits + design-notes references).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/shared/src/version.rs

@@ -19,7 +19,10 @@ pub const PRODUCT_VERSION: &str = env!("CARGO_PKG_VERSION");
 ///
 /// 1.1 additions: `ctx.request.params`, `ctx.request.query`,
 /// `ctx.request.rest`.
-pub const SDK_VERSION: &str = "1.1";
+///
+/// 1.2 additions (v1.1.1): `kv::collection(name).{get,set,has,delete,list}`,
+/// `dead_letters::{replay,resolve}`, `ctx.event` for triggered handlers.
+pub const SDK_VERSION: &str = "1.2";
 
 /// HTTP API major version. Appears in URL paths as `/api/v{N}/...`.
 /// Bump (new integer + new URL prefix) when the request/response