migrate: stow → chezmoi

- restructure repo to chezmoi conventions (dot_ prefix, private_dot_ssh/)
- add nvim config (was untracked)
- encrypt restic pass.txt with age
- remove stow artifacts (.stow-local-ignore, stow package dirs)
- update bootstrap.sh to use chezmoi apply
- remove runtime files from tracking (micro buffers, zed backup)

dot_config/kitty/kitty.conf

@@ -0,0 +1,83 @@
+# Adapted from alacritty/.config/alacritty/alacritty.toml
+# Reference: https://sw.kovidgoyal.net/kitty/conf/
+
+# Launch shell and attach/create tmux session
+shell /usr/bin/zsh -l -c "tmux new-session -A -s main"
+
+# Window appearance
+hide_window_decorations yes
+background_opacity 0.90
+# window_padding_width 1 1
+enable_tab_bar no
+# Alacritty startup_mode=maximized has no direct kitty.conf equivalent.
+# Use: kitty --start-as maximized
+
+# Font
+font_family FiraCode Nerd Font Mono
+bold_font FiraCode Nerd Font Mono Bold
+italic_font FiraCode Nerd Font Mono Italic
+font_size 15.0
+
+# Scrollback
+scrollback_lines 10000
+wheel_scroll_multiplier 5.0
+
+# Selection behavior
+copy_on_select clipboard
+select_by_word_characters @-./_~?&=%+#
+
+# Keep mouse cursor visible while typing
+mouse_hide_wait 0.0
+
+# Cursor
+cursor_shape beam
+cursor_blink_interval 0.5
+cursor_beam_thickness 1.5
+
+# Bell (disable visual bell)
+visual_bell_duration 0.0
+
+# Nord color scheme
+foreground #D8DEE9
+background #2E3440
+
+cursor #D8DEE9
+cursor_text_color #2E3440
+
+selection_foreground #D8DEE9
+selection_background #434C5E
+
+color0  #3B4252
+color1  #BF616A
+color2  #A3BE8C
+color3  #EBCB8B
+color4  #81A1C1
+color5  #B48EAD
+color6  #88C0D0
+color7  #E5E9F0
+
+color8  #4C566A
+color9  #BF616A
+color10 #A3BE8C
+color11 #EBCB8B
+color12 #81A1C1
+color13 #B48EAD
+color14 #8FBCBB
+color15 #ECEFF4
+
+# Key bindings aligned with Alacritty config
+map ctrl+shift+c copy_to_clipboard
+map ctrl+shift+v paste_from_clipboard
+map ctrl+shift+enter new_os_window
+map ctrl+shift+f11 toggle_fullscreen
+
+map ctrl+shift+equal change_font_size all +2.0
+map ctrl+shift+minus change_font_size all -2.0
+map ctrl+shift+0 change_font_size all 0
+
+map ctrl+shift+up scroll_line_up
+map ctrl+shift+down scroll_line_down
+map ctrl+shift+page_up scroll_page_up
+map ctrl+shift+page_down scroll_page_down
+map ctrl+shift+home scroll_home
+map ctrl+shift+end scroll_end