Refactor panes and filesystem; replace FUSE with 9P

Consolidate pane, layout, memory and host code. Serve 9P by default over Unix sockets, with runtime mounts and optional TCP/QUIC transports. Remove FUSE and obsolete proof-of-concept examples.

Fix highlighting and terminal-history performance, expand differential and stress-test infrastructure, sort navigation results while preserving the next occurrence, add syntax-colored Braille minimaps, remove SPC-k, and document 9P interaction as a repository skill.

1 files changed, 8 insertions, 121 deletions

diff --git a/test/snapshots/builtins.golden b/test/snapshots/builtins.golden
index a9a34616..5c9ab060 100644
--- a/test/snapshots/builtins.golden
+++ b/test/snapshots/builtins.golden
@@ -8,73 +8,8 @@
 |     5 line 5
 |     6 line 6
 |     7
-== snap index grid=120x66 cursor=7,35
+== snap window-group grid=120x66 cursor=7,35
 |34:   /tmp/pardes-snap/builtins/cwd/+Help                                            Save New Newtty Del
-|35:      1 pardes builtins, and how to run each:
-|36:      2 SPC and its keys, a chord, a button, the
-|37:      3 topbar - or the name, executed anywhere.
-|38:      4
-|39:      5 SPC ?     Help              topbar
-|40:      6 SPC P     ClipPasteBefore
-|41:      7 SPC R     ClipReplace
-|42:      8 SPC Y     ClipYankMain
-|43:      9 SPC a a   PanelAscii
-|44:     10 SPC a c   PanelCurtain
-|45:     11 SPC a d   PanelDissolve
-|46:     12 SPC a e   PanelEdges
-|47:     13 SPC a f   PanelFall
-|48:     14 SPC a r   PanelScramble
-|49:     15 SPC a s   PanelSlide
-|50:     16 SPC a t   PanelType
-|51:     17 SPC a v   PanelVertical
-|52:     18 SPC a w   PanelWave
-|53:     19 SPC a z   PanelZoom
-|54:     20 SPC c d   Delcol
-|55:     21 SPC c j   Joincol           topbar
-|56:     22 SPC c n   Newcol            topbar
-|57:     23 SPC d     Del
-|58:     24 SPC f c   Config
-|59:     25 SPC f f   Find              topbar
-|60:     26 SPC f g   Grep              topbar
-|61:     27 SPC f n   New               topbar
-|62:     28 SPC f s   Save
-|63:     29 SPC h c   Changelog         topbar
-|64:     30 SPC h m   Messages
-|65:     31 SPC h t   Tutor             topbar
-== snap index-tail grid=120x66 cursor=7,64
-|35:     67 SPC t w   Wrap
-|36:     68 SPC t z   PdfFit
-|37:     69 SPC w h   Left              C-w h, C-w left
-|38:     70 SPC w j   Down              C-w j, C-w down
-|39:     71 SPC w k   Up                C-w k, C-w up
-|40:     72 SPC w l   Right             C-w l, C-w right
-|41:     73 SPC y     ClipYank
-|42:     74           Look              enter, right-click
-|43:     75           Exec              tab, middle-click
-|44:     76           Msg
-|45:     77           ThemeFile
-|46:     78           DumpThemes
-|47:     79           Filter
-|48:     80           EffectCode
-|49:     81           9p
-|50:     82           Theme
-|51:     83           Shell
-|52:     84
-|53:     85 language keys (motions, not words):
-|54:     86 gd gD gy gi gr   goto: definition,
-|55:     87                  declaration, type-def,
-|56:     88                  implementation, refs
-|57:     89 ]d [d ]D [D      diagnostics: next,
-|58:     90                  prev, last, first
-|59:     91 =                format (applies, one
-|60:     92                  undo step)
-|61:     93 Tab after a .    completion, in insert
-|62:     94 C-left-click     definition, by mouse
-|63:     95 SPC l ...        hover, rename, symbols,
-|64:     96                  calls, types: above
-|65:     97
-== snap not-a-picker grid=120x66 cursor=19,61
-== snap window-group grid=120x66 cursor=19,35
 |35:      1 pardes builtins under SPC w
 |36:      2
 |37:      3 SPC w h   Left              C-w h, C-w left
@@ -82,30 +17,13 @@
 |39:      5 SPC w k   Up                C-w k, C-w up
 |40:      6 SPC w l   Right             C-w l, C-w right
 |41:      7
-|42:
-|43:
-|44:
-|45:
-|46:
-|47:
-|48:
-|49:
-|50:
-|51:
-|52:
-|53:
-|54:
-|55:
-|56:
-|57:
-|58:
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-|60:
-|61:
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-|64:
-|65:
+== snap docs-group grid=120x66 cursor=7,35
+|35:      1 pardes builtins under SPC h
+|37:      3 SPC h c   Changelog         topbar
+|38:      4 SPC h m   Messages
+|39:      5 SPC h t   Tutor             topbar
+|40:      6
+|41:
 == snap tutor-from-index grid=120x66 cursor=7,19
 |18:   /Tutor                                                                         Save New Newtty Del
 |19:      1
@@ -123,34 +41,3 @@
 |31:     13
 |32:     14  A pane is just text on screen. There is no separate "buffer" type —
 |33:     15  what you see is what you edit. Some panes happen to be live terminals;
-|35:      1 pardes builtins, and how to run each:
-|36:      2 SPC and its keys, a chord, a button, the
-|37:      3 topbar - or the name, executed anywhere.
-|38:      4
-|39:      5 SPC ?     Help              topbar
-|40:      6 SPC P     ClipPasteBefore
-|41:      7 SPC R     ClipReplace
-|42:      8 SPC Y     ClipYankMain
-|43:      9 SPC a a   PanelAscii
-|44:     10 SPC a c   PanelCurtain
-|45:     11 SPC a d   PanelDissolve
-|46:     12 SPC a e   PanelEdges
-|47:     13 SPC a f   PanelFall
-|48:     14 SPC a r   PanelScramble
-|49:     15 SPC a s   PanelSlide
-|50:     16 SPC a t   PanelType
-|51:     17 SPC a v   PanelVertical
-|52:     18 SPC a w   PanelWave
-|53:     19 SPC a z   PanelZoom
-|54:     20 SPC c d   Delcol
-|55:     21 SPC c j   Joincol           topbar
-|56:     22 SPC c n   Newcol            topbar
-|57:     23 SPC d     Del
-|58:     24 SPC f c   Config
-|59:     25 SPC f f   Find              topbar
-|60:     26 SPC f g   Grep              topbar
-|61:     27 SPC f n   New               topbar
-|62:     28 SPC f s   Save
-|63:     29 SPC h c   Changelog         topbar
-|64:     30 SPC h m   Messages
-|65:     31 SPC h t   Tutor             topbar