Notices become tagline bands at the top of the body

A message, a leader chord and a prompt used to share one row of body text at
the bottom of a pane, wearing the tagline font and nothing else about a
tagline. Now each one is a TagLayer of its own, emitted through the same
renderHeaderLayer the pane and column tags go through, so it gets the tagline
height, the small-font metrics, the band offset and the border for free --
none of which a body-grid row can have by changing its font role. The text is
right aligned. The prompt stays on the canonical grid because it owns a
cursor, and a cursor has to sit on a real cell.

The body starts BELOW the bands rather than under them, the way tree-sitter
context rows already worked. Pane.body_offset is how many rows they took and
Pardes.bodyTop(pane, rect) is the one place that answers "where does the body
begin" -- replacing fifteen copies of `if (tag_bottom) r.y else r.y + BOX_H`
spread across the paint, hit-test, scroll, PDF and image paths, which is what
let the bands and the text under them come adrift. Every notice is painted on
the grid as well, because the grid is what a terminal client draws and a band
it cannot see is a message it never gets; the GUI skips grid cells a tag layer
covers, so nothing is drawn twice.

Three bugs the bands exposed, fixed here:
  - a prompt band flush with the right edge put its caret one column past the
    pane, which the detached wire refuses -- so every frame was dropped for as
    long as the prompt was open. The band now reserves that column.
  - a click on a band mapped to Sel row 0, which is the TAG row: clicking
    chrome expanded a word out of the tagline and ran it as a builtin.
  - a watched file reloading under the editor changed the core without going
    through update, so needs_frame was never set and the reload was never
    drawn. Pardes.invalidate() is the name for that, and the file and theme
    reloads call it.

A session can now drive its own 9P namespace instead of being refused one:
ownMountSuffix answers what a path names inside this editors own tree and
resolve, readLimit and write serve it from memory rather than making the
syscall that never returns. The match is anchored to whole components under
the registrys 9p/pardes/<name>, because a bare /pardes/<name> anywhere in a
string would claim ~/src/pardes/<name>/README -- and, before write learned the
same trick, write the trees bytes over the real file. readFileLimit and
writeFile refuse instead, having no core to answer from.

A toggle setting SETS when given `on` or `off` and only flips when it is bare,
so the report LocationsConfig prints can be fed back as configuration and mean
what it says.

Snapshots: 97/98, from 0/98. The goldens were several commits stale and 17
scripts had stopped running; `config <line>` is a new script command that
appends to the per-script startup config, so a script that clicks body
coordinates pins `Verbose off` instead of counting the rows an announcement
moves. nested-optout is left failing on purpose: two levels of nesting prepend
vaxis F3 codepoints to typed lines, which is a real bug and is written down in
docs/divergences.md with a repro.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

1 files changed, 164 insertions, 53 deletions

diff --git a/test/snapshots/jumps.golden b/test/snapshots/jumps.golden
index 3005135c..9800ca4c 100644
--- a/test/snapshots/jumps.golden
+++ b/test/snapshots/jumps.golden
@@ -1,7 +1,7 @@
 == snap start grid=150x31 cursor=7,3
 |Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
-|New Tty Find Grep Joincol
-|  /tmp/pardes-snap/jumps/cwd/big.txt Save Tty Del Collapse
+|   New Tty Find Grep Joincol Delcol
+|   /tmp/pardes-snap/jumps/cwd/big.txt Save Tty Collapse Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -31,11 +31,14 @@
 |    27 line 27
 |    28 line 28
 == snap to-shell grid=150x31 cursor=79,5
-|1: New Tty Find Grep Joincol                                                  New Tty Find Grep Joincol
-|2:   /tmp/pardes-snap/jumps/cwd/big.txt Save Tty Del Collapse                   /tmp/pardes-snap/jumps/cwd Save Tty Del Togglettymode Filter Collapse
+|1:    New Tty Find Grep Joincol Delcol                                           New Tty Find Grep Joincol Delcol
+|2:    /tmp/pardes-snap/jumps/cwd/big.txt Save Tty Collapse Del                   /tmp/pardes-snap/jumps/cwd Tty Save Mode Filter Collapse Del
 |3:      1 line 1                                                                ls
 |4:      2 line 2                                                                big.txt
 == snap to-file grid=150x31 cursor=7,3
+|3:      1 line 1                                                                                                                                     Left
+|4:      2 line 2                                                                ls
+|5:      3 line 3                                                                big.txt
 == snap goto-100 grid=150x31 cursor=7,27
 |3:     76 line 76                                                               ls
 |4:     77 line 77                                                               big.txt
@@ -65,10 +68,40 @@
 |28:    101 line 101
 |29:    102 line 102
 |30:    103 line 103
-== snap back-in-file grid=150x31 cursor=7,3
-|3:      1 line 1                                                                ls
-|4:      2 line 2                                                                big.txt
-|5:      3 line 3
+== snap back-in-file grid=150x31 cursor=7,4
+|3:                                                                        Back  ls
+|4:      1 line 1                                                                big.txt
+|5:      2 line 2
+|6:      3 line 3
+|7:      4 line 4
+|8:      5 line 5
+|9:      6 line 6
+|10:      7 line 7
+|11:      8 line 8
+|12:      9 line 9
+|13:     10 line 10
+|14:     11 line 11
+|15:     12 line 12
+|16:     13 line 13
+|17:     14 line 14
+|18:     15 line 15
+|19:     16 line 16
+|20:     17 line 17
+|21:     18 line 18
+|22:     19 line 19
+|23:     20 line 20
+|24:     21 line 21
+|25:     22 line 22
+|26:     23 line 23
+|27:     24 line 24
+|28:     25 line 25
+|29:     26 line 26
+|30:     27 line 27
+== snap back-to-shell grid=150x31 cursor=79,5
+== snap forward-file grid=150x31 cursor=7,3
+|3:      1 line 1                                                                                                                                  Forward
+|4:      2 line 2                                                                ls
+|5:      3 line 3                                                                big.txt
 |6:      4 line 4
 |7:      5 line 5
 |8:      6 line 6
@@ -94,12 +127,41 @@
 |28:     26 line 26
 |29:     27 line 27
 |30:     28 line 28
-== snap back-to-shell grid=150x31 cursor=79,5
-== snap forward-file grid=150x31 cursor=7,3
-== snap forward-100 grid=150x31 cursor=7,17
-|3:     86 line 86                                                               ls
-|4:     87 line 87                                                               big.txt
-|5:     88 line 88
+== snap forward-100 grid=150x31 cursor=7,18
+|3:                                                                     Forward  ls
+|4:     86 line 86                                                               big.txt
+|5:     87 line 87
+|6:     88 line 88
+|7:     89 line 89
+|8:     90 line 90
+|9:     91 line 91
+|10:     92 line 92
+|11:     93 line 93
+|12:     94 line 94
+|13:     95 line 95
+|14:     96 line 96
+|15:     97 line 97
+|16:     98 line 98
+|17:     99 line 99
+|18:    100 line 100
+|19:    101 line 101
+|20:    102 line 102
+|21:    103 line 103
+|22:    104 line 104
+|23:    105 line 105
+|24:    106 line 106
+|25:    107 line 107
+|26:    108 line 108
+|27:    109 line 109
+|28:    110 line 110
+|29:    111 line 111
+|30:    112 line 112
+== snap last grid=150x31 cursor=79,5
+|3:                                                                        Last  ls
+== snap last-back grid=150x31 cursor=7,17
+|3:     86 line 86                                                                                                                                    Last
+|4:     87 line 87                                                               ls
+|5:     88 line 88                                                               big.txt
 |6:     89 line 89
 |7:     90 line 90
 |8:     91 line 91
@@ -125,47 +187,95 @@
 |28:    111 line 111
 |29:    112 line 112
 |30:    113 line 113
-== snap last grid=150x31 cursor=79,5
-== snap last-back grid=150x31 cursor=7,17
-== snap jumplist grid=150x31 cursor=7,17
-|26:   /tmp/pardes-snap/jumps/cwd/+Jumps Save Tty Del Collapse
+== snap jumplist grid=150x31 cursor=7,18
+|3:                                                                    Jumplist  ls
+|4:     86 line 86                                                               big.txt
+|5:     87 line 87
+|6:     88 line 88
+|7:     89 line 89
+|8:     90 line 90
+|9:     91 line 91
+|10:     92 line 92
+|11:     93 line 93
+|12:     94 line 94
+|13:     95 line 95
+|14:     96 line 96
+|15:     97 line 97
+|16:     98 line 98
+|17:     99 line 99
+|18:    100 line 100
+|19:    101 line 101
+|20:    102 line 102
+|21:    103 line 103
+|22:    104 line 104
+|23:    105 line 105
+|24:    106 line 106
+|25:    107 line 107
+|26:    /tmp/pardes-snap/jumps/cwd/+Jumps Save Tty Collapse Del LocationsConfig
 |27:      1 @p1:3:3 /tmp/pardes-snap/jumps/cwd
 |28:      2 /tmp/pardes-snap/jumps/cwd/big.txt:1:1 line 1
 |29:      3 @p1:3:3 /tmp/pardes-snap/jumps/cwd
 |30:      4 /tmp/pardes-snap/jumps/cwd/big.txt:100:1 line 100
 == snap step1-shell grid=150x31 cursor=79,5
+|3:     86 line 86                                                               ls
+|4:     87 line 87                                                               big.txt
+|5:     88 line 88
+|6:     89 line 89
+|7:     90 line 90
+|8:     91 line 91
+|9:     92 line 92
+|10:     93 line 93
+|11:     94 line 94
+|12:     95 line 95
+|13:     96 line 96
+|14:     97 line 97
+|15:     98 line 98
+|16:     99 line 99
+|17:    100 line 100
+|18:    101 line 101
+|19:    102 line 102
+|20:    103 line 103
+|21:    104 line 104
+|22:    105 line 105
+|23:    106 line 106
+|24:    107 line 107
+|25:    108 line 108
+|27:                                                                        Look
+|28:      1 @p1:3:3 /tmp/pardes-snap/jumps/cwd
+|29:      2 /tmp/pardes-snap/jumps/cwd/big.txt:1:1 line 1
+|30:      3 @p1:3:3 /tmp/pardes-snap/jumps/cwd
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+|20: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|21: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|22: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|23: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|24: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|25: 0-0 d,#152019, 1-1 d,#0d1410, 2-6 #59675c,#0d1410, 7-14 #e5eee5,#0d1410, 15-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|26: 0-1 #ffffff,#496656, 2-2 d,#1d2824, 3-29 #b2c3b8,#1d2824, 30-35 #d3b0d9,#1d2824, 36-73 #b2c3b8,#1d2824, 74-74 d,#1d2824, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|27: 0-0 d,#152019, 1-1 d,#0d1410, 2-70 d,#1d2824, 71-74 #b2c3b8,#1d2824, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|28: 0-0 d,#608269, 1-1 d,#0d1410, 2-13 #59675c,#0d1410, 14-40 #e5eee5,#0d1410, 41-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|29: 0-0 d,#608269, 1-1 d,#0d1410, 2-44 #59675c,#0d1410, 45-51 #e5eee5,#0d1410, 52-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
+|30: 0-0 d,#152019, 1-1 d,#0d1410, 2-13 #59675c,#0d1410, 14-40 #e5eee5,#0d1410, 41-74 d,#0d1410, 75-75 d,#608269, 76-76 d,#0d1410, 77-149 #e5eee5,#0d1410,
 == snap step2-file grid=150x31 cursor=7,3
 |3:      1 line 1                                                                ls
 |4:      2 line 2                                                                big.txt
@@ -214,9 +324,10 @@
 |23:    109 line 109
 |24:    110 line 110
 |25:    111 line 111
-|27:      2 /tmp/pardes-snap/jumps/cwd/big.txt:1:1 line 1
-|28:      3 @p1:3:3 /tmp/pardes-snap/jumps/cwd
-|29:      4 /tmp/pardes-snap/jumps/cwd/big.txt:100:1 line 100
-|30:      5
+|28:      2 /tmp/pardes-snap/jumps/cwd/big.txt:1:1 line 1
+|29:      3 @p1:3:3 /tmp/pardes-snap/jumps/cwd
+|30:      4 /tmp/pardes-snap/jumps/cwd/big.txt:100:1 line 100
 == snap step-back grid=150x31 cursor=79,5
-== snap look-row grid=150x31 cursor=7,14
+== snap look-row grid=150x31 cursor=79,5
+|5:     91 line 91                                                               ls
+|6:     92 line 92                                                               big.txt