…ncoding (PR #132)

PR #131 - Multi-line paste reverse order in PowerShell:
- Root cause: write_paste_chunked sends clipboard text with bare LF to PTY pipe.
  ConPTY expects CR for Enter; bare LF confuses PSReadLine, causing reversed order.
- Fix: Normalize line endings (LF->CR, CRLF->CR) in write_paste_chunked before
  writing to the PTY pipe.

PR #132 - Shift+Enter not working for VS Code terminal / Node.js apps:
- Root cause (client): VS Code xterm.js sends ESC+CR for Shift+Enter. ConPTY
  interprets ESC as Alt prefix, so crossterm misreports Alt+Enter.
- Root cause (server): CSI 13;2~ encoding is non-standard (code 13 not in VT
  function key table) and silently dropped by ConPTY.
- Fix (client): augment_enter_shift polls GetAsyncKeyState(VK_SHIFT) to detect
  physical Shift key and remaps crossterm's misreported Alt+Enter to Shift+Enter.
- Fix (server): encode_key_event and send_key_to_active send ESC+CR instead of
  CSI 13;mod~ for Shift/Alt+Enter on Windows. This matches VS Code xterm.js
  encoding and round-trips through ConPTY -> libuv correctly.
- Ctrl+Enter variants still use CSI encoding (unaffected by ConPTY).

Tests: 7 new unit tests covering paste normalization (LF, CRLF, mixed, bracketed)
and Shift/Alt+Enter ConPTY encoding. All 68 tests pass.

Brings 17 upstream commits into ohboy-builds:
- fix: warm claim race condition (psmux#136)
- fix: client_prefix flag, window_zoomed_flag (psmux#125, psmux#126)
- fix: Shift+Enter/Ctrl+Enter modifiers, paste normalization (psmux#131, psmux#132)
- fix: backslash escape, 6 client-server bugs (psmux#118, psmux#123)
- fix: -f global option (psmux#119)
- fix: set-hook replace/remove, zoomed navigation wrap (psmux#133, psmux#134)
- fix: TERM env var mapping, hyphenated option leak (psmux#137)
- feat: bell/activity/silence monitoring, allow-rename, update-environment
- feat: vim-style bind-key C-hjkl pane navigation (psmux#130)
- feat: XDG plugin path support (psmux#135)
- feat: auto-generate changelog in release workflow
- refactor: move Rust tests to tests-rs/ directory
- refactor: rich test dashboard

Also applies ohboy-builds stashed changes:
- Remove claude-code-fix-tty (Claude Code now auto-detects $TMUX)
- Migrate env::set_var to safe crate::util::set_env wrappers (Rust 1.83)
- Selection clamp to pane boundaries in copy mode
- Fix clippy warnings in forked crates (vt100-psmux, portable-pty-psmux)

…PTY encoding (PR psmux#132)

PR psmux#131 - Multi-line paste reverse order in PowerShell:
- Root cause: write_paste_chunked sends clipboard text with bare LF to PTY pipe.
  ConPTY expects CR for Enter; bare LF confuses PSReadLine, causing reversed order.
- Fix: Normalize line endings (LF->CR, CRLF->CR) in write_paste_chunked before
  writing to the PTY pipe.

PR psmux#132 - Shift+Enter not working for VS Code terminal / Node.js apps:
- Root cause (client): VS Code xterm.js sends ESC+CR for Shift+Enter. ConPTY
  interprets ESC as Alt prefix, so crossterm misreports Alt+Enter.
- Root cause (server): CSI 13;2~ encoding is non-standard (code 13 not in VT
  function key table) and silently dropped by ConPTY.
- Fix (client): augment_enter_shift polls GetAsyncKeyState(VK_SHIFT) to detect
  physical Shift key and remaps crossterm's misreported Alt+Enter to Shift+Enter.
- Fix (server): encode_key_event and send_key_to_active send ESC+CR instead of
  CSI 13;mod~ for Shift/Alt+Enter on Windows. This matches VS Code xterm.js
  encoding and round-trips through ConPTY -> libuv correctly.
- Ctrl+Enter variants still use CSI encoding (unaffected by ConPTY).

Tests: 7 new unit tests covering paste normalization (LF, CRLF, mixed, bracketed)
and Shift/Alt+Enter ConPTY encoding. All 68 tests pass.