feat(tools): add --all flag for bulk install/plan with auth hints

[alohays]

Summary

• Add --all flag to bin/dotfiles tools install and tools plan for bulk operation across all 10 supported tools
• Add post-install auth hints for tools requiring authentication (gws, slack-cli, rtk) — shown per-tool and as a summary after --all
• Continue-on-error semantics: one tool failing does not abort the rest, with colored ok/fail summary

Details

New commands:

bin/dotfiles tools install --all          # install all 10 tools
bin/dotfiles tools plan --all             # show install plans for all tools
bin/dotfiles tools install --all --method brew  # force brew for all

Auth hints:

dotfiles: Authenticate: gws auth login
dotfiles: Authenticate: slack login
dotfiles: Authenticate: rtk auth login

New functions in tools.sh:

• _dotfiles_tool_auth_hint() — maps tool names to auth commands (extensible via case arms)
• _dotfiles_show_auth_hint() — displays auth hint after individual tool install
• dotfiles_install_all_tools() — iterates all tools with ok/fail counters + auth summary
• dotfiles_plan_all_tools() — prints indented plans for all tools

Test plan

• bin/dotfiles tools plan --all outputs all 10 tools
• DOTFILES_DRY_RUN=1 bin/dotfiles tools install --all dry-run with "dry-run complete" header + auth summary
• bin/dotfiles tools install --all sometool errors with mutual exclusivity message
• Individual tool install shows auth hint (DOTFILES_DRY_RUN=1 bin/dotfiles tools install googleworkspace-cli)
• python3 -m pytest tests/test_standard_first.py -v — 14 passed (2 new)
• bash -n scripts/sh/tools.sh — syntax OK
• Code review: POSIX sh compliant, no bashisms

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