docs(release): bump displayed version to 0.13.0 (site + install snippets) (#163)

* docs(release): bump displayed version to 0.13.0 (site + install snippets)

Same shape as #160 for v0.12.0: the Cargo install snippets in README,
docs/ask.md, and docs/embedding.md, plus the site-wide version constant
in web/src/lib/site.ts. v0.13.0 shipped HAVING (SQLR-52, #161).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* chore(playground): refresh vendored WASM bundle to the 0.13.0 engine

The /playground pkg is a pinned copy Vercel never rebuilds, so it was
still serving the pre-0.12 engine (last refreshed in SQLR-42). Rebuilt
via the documented flow in examples/wasm-playground/README.md; only the
.wasm binary changed (no SDK API change, glue files identical). Also
picks up sdk/wasm/Cargo.lock's 0.13.0 bump — sdk/wasm sits outside the
workspace, so the Release PR's lock refresh couldn't reach it.

Smoke-verified in Node: GROUP BY ... HAVING total > 100 returns the
filtered group through the new bundle.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: joaoh82

README.md

@@ -214,8 +214,8 @@ Expressions in `WHERE` and `UPDATE`'s `SET` RHS:
 
 ```toml
 [dependencies]
-sqlrite-engine = "0.12"
-sqlrite-ask    = "0.12"
+sqlrite-engine = "0.13"
+sqlrite-ask    = "0.13"
 ```
 
 ```rust

docs/ask.md

@@ -131,8 +131,8 @@ If `SQLRITE_LLM_API_KEY` is missing, the panel surfaces a clean "missing API key
 
 ```toml
 [dependencies]
-sqlrite-engine = "0.12"
-sqlrite-ask    = "0.12"
+sqlrite-engine = "0.13"
+sqlrite-ask    = "0.13"
 ```
 
 ```rust

docs/embedding.md

@@ -153,8 +153,8 @@ The retryable-error branch is the headline new flow: pick a backoff policy that
 [dependencies]
 # `ask` is a default feature on sqlrite-engine; opt out with
 # default-features = false if you don't want the LLM stack pulled in.
-sqlrite-engine = "0.12"
-sqlrite-ask    = "0.12"
+sqlrite-engine = "0.13"
+sqlrite-ask    = "0.13"
 ```
 
 ```rust

sdk/wasm/Cargo.lock

@@ -1,7 +1,7 @@
 export const SITE = {
   url: "https://sqlritedb.com",
   twitterHandle: "@CodePolyglot",
-  version: "0.12.0",
+  version: "0.13.0",
   repo: "https://github.com/joaoh82/rust_sqlite",
   discord: "https://discord.gg/dHPmw89zAE",
   docsRs: "https://docs.rs/sqlrite-engine",