feat: add avy (in-buffer jump) and wgrep (editable grep)

The two clear wins from the package-list review. avy fills the in-buffer motion gap (C-: jump-to-char-timer, M-g w/l for word/line) that windmove and isearch leave open; wgrep turns a consult-grep / embark-export result into an editable, write-back-across-files refactor (C-c C-p to edit, C-c C-c to apply).

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