feat(bash): shell/prompt modernization — 8 focused improvements

[Copilot]

Eight targeted quality-of-life improvements to the bash/shell setup. Each change is its own commit for clean cherry-picking.

Shell options (options.bash)

• globstar — ** recursive globbing
• checkwinsize — keeps $LINES/$COLUMNS accurate after resize
• autocd — navigate by typing a path directly
• dirspell — spell-correction for directory tab-completion
• histverify — shows !! expansion in readline buffer before executing

Readline (.inputrc)

Added visual completion improvements: colored-stats, colored-completion-prefix, mark-symlinked-directories, visible-stats, menu-complete-display-prefix, page-completions off

Aliases (.aliases)

• merged: replaced hardcoded master with dynamic default branch via git symbolic-ref
• egrep/fgrep: replaced deprecated binaries with grep -E/grep -F
• kubectl k alias: removed ad-hoc complete -F __start_kubectl k — now lives in completions.bash

Environment (.profile)

• HISTCONTROL: added erasedups to remove older duplicate entries on flush
• MANPAGER: uses bat -l man -p when available for syntax-highlighted man pages; falls back to less -X
• Fixed stale comment referencing ag instead of rg

Completions (completions.bash)

Added proper completions for gh (covers gh copilot), kubectl (with k alias binding), and terraform:

if command -v gh &>/dev/null; then
  eval "$(gh completion -s bash)"
fi

if command -v kubectl &>/dev/null; then
  source <(kubectl completion bash)
  complete -o default -F __start_kubectl k
fi

if command -v terraform &>/dev/null; then
  complete -C terraform terraform
fi

[Copilot]

🟡 Not ready to approve

The updated merged alias can break when origin/HEAD is unset, and the new completions logic runs expensive generators on every shell startup without guards.

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Pull request overview

This PR modernizes the Bash prompt/shell experience in this dotfiles repo with a set of small, focused ergonomics improvements across environment defaults, Readline UI, shell options, aliases, and tab completions.

Changes:

• Improves interactive shell behavior via new Bash shopt options and enhanced Readline completion visuals.
• Updates environment defaults (history behavior, MANPAGER using bat when available, and a corrected fzf comment).
• Refines git/grep/kubectl aliases and adds CLI completions for gh, kubectl (k), and terraform.

File summaries

File	Description
.profile	Updates history control, adds bat-based MANPAGER fallback logic, and fixes an fzf comment.
.inputrc	Adds Readline visual completion settings.
.config/bash/options.bash	Enables additional interactive Bash shell options (globstar, checkwinsize, autocd, dirspell, histverify).
.config/bash/completions.bash	Adds gh, kubectl (k), and terraform completions.
.aliases	Modernizes merged, replaces deprecated egrep/fgrep, and moves k completion wiring out of aliases.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 3
• Review effort level: Low

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