feat: shell completions for bitcoin wrapper executable #33747

1. 
   hulxv commented at 6:09 pm on October 30, 2025: none

   Add shell (bash, fish, and zsh) completions for unified bitcoin CLI

   This PR adds comprehensive shell completion scripts for the new unified bitcoin command-line interface introduced in #31375. The completions support bash, zsh, and fish shells and provide tab completion for all available commands, options, and arguments.

   Example Usage

    0# Complete subcommands
    1bitcoin <TAB>
    2# gui  node  rpc  wallet  tx  help  bench  chainstate  test  test-gui
    3
    4# Complete RPC methods  
    5bitcoin rpc <TAB>
    6# getblockchaininfo  getbestblockhash  getblock  ...
    7
    8# Complete options
    9bitcoin node -<TAB>
   10# -datadir  -conf  -daemon  -help  -rpcport  ...
   

   Close #33603

2. feat: add bash completion script for bitcoin commands 46e7f2cdcb
3. feat: add fish shell completions for bitcoin commands and subcommands d33d2441dc
4. feat: add zsh completion script for bitcoin commands 21eecacfa7
5. feat: update README to include zsh completions in command line tools section aec403ee0d
6. 
   DrahtBot commented at 6:09 pm on October 30, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33747.

   Reviews

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #33402 (contrib: Add zsh completion scripts by mstampfer)
   • #33385 (contrib: Add bash completion for new bitcoin command by caesrcd)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

Contributors
hulxv DrahtBot