Re-add `fuzzy` with a faithful fzf algorithm port

[tony]

Summary

Once it can be done faithfully, bring back a non-interactive fuzzy filter shaped like fzf --filter. The previous implementation wrapped rapidfuzz (WRatio / partial_ratio), which only approximated fzf's scoring; a re-introduction should port fzf's actual algorithm so --algo v1|v2, the extended-search grammar, and --tiebreak behave like fzf. Companion to the removal (linked below).

Reference — fzf v0.72.0

• Fuzzy algorithms (--algo):
  • FuzzyMatchV2: https://github.com/junegunn/fzf/blob/v0.72.0/src/algo/algo.go#L428-L710
  • FuzzyMatchV1: https://github.com/junegunn/fzf/blob/v0.72.0/src/algo/algo.go#L711-L790
• Extended-search grammar (^prefix, suffix$, 'exact, !negation, AND, | OR):
  • parseTerms: https://github.com/junegunn/fzf/blob/v0.72.0/src/pattern.go#L168-L251
  • BuildPattern: https://github.com/junegunn/fzf/blob/v0.72.0/src/pattern.go#L79-L167
• Tiebreak criteria (length / begin / end / index / chunk):
  • criterion: https://github.com/junegunn/fzf/blob/v0.72.0/src/options.go#L265-L274
  • parseTiebreak: https://github.com/junegunn/fzf/blob/v0.72.0/src/options.go#L1315-L1370
• Non-interactive --filter / -f mode (match stdin, print, no TUI):
  • https://github.com/junegunn/fzf/blob/v0.72.0/src/core.go#L257-L349

Open questions

• Port fzf's V1/V2 scoring + tiebreak directly (or via a faithful Python port) rather than re-introducing the rapidfuzz approximation.
• Keep it a generic stdin filter (fzf-parity, pipe-friendly), or also add a mode that filters the agent stores so it fits an agent-history tool?

Acceptance criteria

• --algo v1|v2, extended-search tokens, and --tiebreak match fzf --filter output on a shared fixture corpus.
• Restore the CLI page + card and the test suite; full gate green.