chore(deps): update @ai-hero/sandcastle to 0.5.11

chore(deps): update @ai-hero/sandcastle to 0.5.11

Refresh the patch via 'pnpm patch'/'pnpm patch-commit' and pin the
patch key to the exact version so context drift on future bumps
fails loudly instead of applying silently.

Patch semantics are unchanged: it still adds the 'thinking' option
to PiOptions and threads '--thinking <level>' into the pi agent
provider's print command. Only context lines and blob hashes are
refreshed for 0.5.11 (DEFAULT_MODEL bumped to claude-opus-4-7
upstream).