feat(path-cli): native ratatui picker — Atuin-style selection, skim removed

[od0]

Replaces the embedded skim backend with a first-party ratatui picker behind the existing fuzzy::pick seam — all ~26 call sites (p import, share, resume) upgrade with zero call-site changes. UX inspired by Atuin. External fzf stays untouched as the escape hatch (--picker fzf).

What's in the box

• crates/path-cli/src/tui/ — mod.rs (event loop, terminal lifecycle), state.rs (pure handle_event, event-vector testable), render.rs (layout ladder, match-highlight spans), matcher.rs (nucleo-matcher + a real parser for fzf --with-nth notation), preview.rs (debounced async preview via std::thread + mpsc, per-row cache, kill-on-supersede).
• Adaptive layout ladder (DEFAULT_LAYOUT, one-line constant): inline compact at the bottom of the terminal when no preview is configured (Atuin-style); fullscreen when a preview is configured — side-by-side ≥100 cols, stacked below.
• nucleo matching brings fzf-style query operators everywhere: space=AND, 'exact, ^prefix, !negate. Hidden columns (with_nth) are neither shown nor searchable, same as fzf.
• Previews run the same {exe} show --ansi … shell templates as before, 100 ms debounce, ANSI → ratatui via ansi-to-tui with plain-text fallback; loading/error states render in-pane and never kill the picker.
• Terminal hygiene: renders to stderr (stdout stays clean for piped results), idempotent restore on drop and panic, raw mode undone even when setup fails mid-way, inline viewport cleared with the cursor homed so the shell resumes exactly where the picker sat.
• skim removed: skim_picker.rs deleted; embedded-picker feature repointed to ratatui/crossterm/nucleo-matcher/ansi-to-tui/unicode-segmentation — all already in the tree (skim 4.x was itself a ratatui app), and the lockfile sheds skim/tui-term/portable-pty/frizbee. --picker skim is a hidden alias for native with a one-time deprecation note.

Verification

• Full suite green under RUSTFLAGS="-D warnings"; scripts/quality_gates.sh -site 7/7 PASS.
• Event-vector tests pin the transition table (marks survive query changes, Ctrl-D-on-empty cancels, hidden-column non-searchability, equal-score tiebreak by input order); insta TestBackend snapshots pin 8 render states, plus style-level assertions that highlight spans are grapheme-correct (emoji-ZWJ titles highlight the matched text, not the emoji) and carry bold/underline.
• Opt-in real-PTY smoke tests (cargo test -p path-cli --test picker_pty -- --ignored): accept-first-row exits 0 with a cache id on stdout; Esc exits 130. Both pass locally.
• Adversarially reviewed pre-push; all findings fixed (grapheme index space, raw-mode leak on setup failure, preview kill-slot race, dishonest tiebreak test, missing style assertions, cursor homing, hidden-pane preview spawns).

Rebase notes

• Version slot: path-cli 0.16.1 → 0.17.0 in the four conventional places; path query: parallel per-file execution (path-cli 0.17.0) #138/feat(resume): path resume --remote <ssh-url> — resume a session on a remote host #145 and the sibling bare-resume PR also claim 0.17.0 — whichever lands second renumbers.
• No changes to cmd_resume.rs/cmd_share.rs logic; feat(resume): path resume --remote <ssh-url> — resume a session on a remote host #145/feat(resume): remote persistence & transport picker (--persist / --via) #146/Plugin /path:resume + /path:link-pr; fixes that make projected Claude sessions resumable #150 are untouched surface.

Spec + plan: docs/superpowers/{specs,plans}/2026-08-03-native-picker*.

Sibling PR: bare path resume (#110) adds a session picker above this same seam — independent; either merges first.

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