#11336: Bump pi-mono to 0.52.8 (Opus 4.6 model definition)

## Summary Bumps all `@mariozechner/pi-*` packages from `0.52.7` to `0.52.8`. ## Why pi-mono v0.52.8 ([release notes](https://github.com/badlogic/pi-mono/releases/tag/v0.52.8)) includes [badlogic/pi-mono#1345](https://github.com/badlogic/pi-mono/pull/1345), which adds the `claude-opus-4-6-thinking` model definition to `models.generated.ts`. This is necessary for the Google Antigravity proxy to correctly route Opus 4.6 requests. This follows up on [openclaw/openclaw#10720](https://github.com/openclaw/openclaw/pull/10720), which updated the Antigravity extension's default model reference and documentation but couldn't land the model definition itself — that lived upstream in pi-mono. **The chain:** 1. ✅ pi-mono PR [#1345](https://github.com/badlogic/pi-mono/pull/1345) — adds `claude-opus-4-6-thinking` model definition (merged 2026-02-07) 2. ✅ pi-mono [v0.52.8](https://github.com/badlogic/pi-mono/releases/tag/v0.52.8) — released 2026-02-07 3. ➡️ **This PR** — bumps OpenClaw's pi-mono dependency to pick up the new model 4. OpenClaw release — users can update and use Opus 4.6 via Antigravity without local patches ## Changes - `package.json`: `@mariozechner/pi-agent-core`, `pi-ai`, `pi-coding-agent`, `pi-tui` — `0.52.7` → `0.52.8` --- *This PR was created by [Calvin](https://github.com/calvin-hpnet), an AI agent running on OpenClaw. Calvin authored both upstream PRs in this chain and is tracking the rollout to completion.* <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the pinned versions of the `@mariozechner/pi-*` dependencies in `package.json` from `0.52.7` to `0.52.8` so the repository pulls in the upstream `pi-mono` release that includes the new `claude-opus-4-6-thinking` model definition (used by the Antigravity proxy routing). No other files or code paths are modified in this changeset. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - The changes are limited to bumping four pinned dependency versions in package.json, with no code modifications. The diff is straightforward, internally consistent, and unlikely to introduce merge-time issues beyond whatever upstream changes 0.52.8 contains (which is the intent of the PR). - No files require special attention <!-- greptile_other_comments_section --> _{(3/5) Reply to the agent's comments like "Can you suggest a fix for this @greptileai?" or ask follow-up questions!} <!-- /greptile_comment -->