feat(config): integrate iris and streamline keybindings

dot_config/iris/config.toml

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+# iris (https://github.com/versenilvis/iris): inline completion menu that wraps
+# the shell in its own pty. Started from fish and zsh (`iris init <shell>` in
+# config.fish / .zshrc). `iris config show` prints the merged result; missing
+# keys fall back to iris's defaults.
+
+[core]
+version = 1                    # config schema version
+shell = ""                     # auto-detect; `iris init <shell>` exports IRIS_ACTIVE_SHELL, which wins anyway
+shell-login = false            # run shell as a login shell (also: iris --shell-login)
+# Every shell opens in spec mode: Fig-style completions (subcommands, flags,
+# paths) pop up as you type. ctrl+r still flips to history for that session;
+# "last" would carry a stray ctrl+r into every later shell.
+mode = "spec"                  # "last", "spec", or "history"
+debug = false                  # verbose logging to iris.log (also: iris -d); logs every keystroke
+expand-alias = true            # expand aliases before matching
+auto-execute = false           # run suggestion immediately instead of inserting it
+atuin-history = 0              # shell history only: atuin is not used under iris
+atuin-db-path = ""             # path to atuin's history.db, empty = use default
+cobra-probe-enabled = true     # fall back to probing cobra binaries for completions
+# Menu closed: up/down browse iris's own history (Fig-style). No shell binds
+# up/down; handing them to the shell ran the old down -> pj picker inside
+# iris's pty, and the two fought over the screen.
+navigate-closed = "history"
+
+[ui]
+style = "modern"       # "modern" or "classic"
+ghost-text = 1         # 0 = off, 1 = menu + ghost text, 2 = ghost text only
+hidden-files = false   # include dotfiles in suggestions
+max-suggestions = 100  # max suggestions ranked before display
+max-height = 6         # max visible rows in the menu
+max-width = 0          # menu width: columns (80) or a share ("80%"), 0 = default
+nerd-fonts = true      # use nerd-font icons (Victor Mono Nerd Font)
+
+# ctrl+r, tab, shift+tab, up and down never reach the shell while iris runs;
+# tv's own ctrl-r history binding (`tv init`) is shadowed by toggle-mode.
+[keybindings]
+toggle-mode = "ctrl+r"     # switch spec/history mode
+toggle-menu = "shift+tab"  # show or hide the suggestion menu
+select = "tab"             # accept the selected suggestion
+navigate-up = "up"         # select up (menu open)
+navigate-down = "down"     # select down (menu open)
+navigate-right = "right"   # accept ghost text
+
+[git]
+filter-active-branch = true  # exclude current branch from suggestions
+deduplicate-branches = true  # merge same-name local/remote branches
+
+# Installed from the AUR (iris-autocomplete): pacman/paru owns updates, so iris
+# neither checks nor installs on its own.
+[updater]
+check-on-startup = false
+channel = "stable"
+check-interval = "24h"
+auto-update = 0
+
+[zoxide]
+extend-cd = true  # complete `cd` from zoxide's database (conf.d/40-tools.fish runs `zoxide init fish`)
+
+[ai]
+enabled = false
+provider = "groq"  # "groq" or "ollama"
+debounce_ms = 400  # ms to wait before querying the AI
+
+[ai.providers.groq]
+endpoint = "https://api.groq.com/openai/v1/chat/completions"
+api_key_env = "GROQ_API_KEY"  # read from the environment, never stored here
+model = "llama-3.3-70b-versatile"
+timeout_ms = 3000
+
+[ai.providers.ollama]
+endpoint = "http://localhost:11434/v1/chat/completions"
+model = "qwen2.5-coder"
+timeout_ms = 5000