chore(master): release 1.6.0

[github-actions]

🤖 I have created a release beep boop

1.6.0 (2026-05-13)

Features

• add overlap option and support negative render_offset_top (faccd45)
• add overlap option to reduce virtual padding for overlapping images (1296220)
• kitty: make direct chunk size configurable (aa67a40)
• lazy load image stack and add dev shell (9d3c45c), closes #361

Bug Fixes

• add BufEnter to document integration autocmds (72e5a91)
• add BufEnter to document integration autocmds (7944093)
• core: prevent stale images after buffer switch (73a6461)
• core: stabilize image redraw & scheduling 🔥 (ffdffef)
• kitty: close handles after write (7d3ae93), closes #363
• kitty: target tmux pane for image placement (c241753)
• large Kitty direct image transfers over SSH. (44e0712)
• performance: increase throughput via bigger direct_chunk_size (d1d3d27)
• renderer: preserve default virtual padding (9adf7c7)
• tty+ssh: renderer should know when it is in a tty (fixes #95) (5cade29)

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