chore: release v0.8.0

[kartojal]

Summary

• release polymarket_client_sdk_v2 v0.8.0
• document PolyV2 position ID support from feat(clob): support PolyV2 position IDs #112
• replace yanked chacha20 0.10.0 with compatible 0.10.2 in Cargo.lock

Validation

• cargo +nightly-2025-11-24 fmt --all -- --check
• cargo +1.88.0 build --all-targets --all-features --locked
• cargo +1.88.0 clippy --all-targets --all-features --locked -- -D warnings
• cargo +1.88.0 clippy --all-targets --locked -- -D warnings
• cargo +1.88.0 test --all-features --locked (613 passed, 21 ignored)
• cargo +1.88.0 test --locked
• cargo +1.88.0 package --locked --all-features
• cargo +1.88.0 publish --dry-run --locked --all-features

After merge

Publish manually from an up-to-date, clean main checkout:

cargo +1.88.0 publish --locked --all-features

---

Note

Low Risk
Release metadata and lockfile refresh only; no SDK source changes in this PR.

Overview
Cuts v0.8.0 of polymarket_client_sdk_v2 by bumping the crate version in Cargo.toml / Cargo.lock and adding a 0.8.0 changelog section dated 2026-09-08.

The release notes call out Polymarket V2 position IDs for Exchange V3 orders and market-data reads (#112), moved out of [Unreleased] with a PR link. Cargo.lock also moves chacha20 from yanked 0.10.0 to 0.10.2 (transitive dependency only; no Cargo.toml dependency changes in this diff).

^{Reviewed by Cursor Bugbot for commit c213afe. Bugbot is set up for automated code reviews on this repo. Configure here.}

[naruto11eth]

lgtm