Implement internal/cli package (task 352/cli)

Full command dispatch, interactive shell loop, and all geheim commands
mirroring the Ruby CLI class (geheim.rb lines 551-713).

Key design points:
- CLI struct holds all runtime deps; lastResult field enables Ruby-style
  fallback search term when a search command is given without an argument
- dispatch → dispatchSimple (no-term commands) + dispatchSearch (term-based)
  kept under ~50 lines each per style guidelines
- ActionOpen shreds the exported file immediately after opening, matching
  Ruby's shred_file(delay: 0) call
- import implements Ruby's three-way dest_dir logic: nil→full src_path,
  contains-dot→literal dest, plain-dir→dir/basename(src)
- completionFn notes $PIN limitation for description completion
- openExported extends Ruby's OS detection with xdg-open, iTerm, Termux
  heuristics; comment documents the divergence from Ruby's evince default

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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