FABRIC.md: defer toggle meta-key choice, add morning resume punch list

TAB was recorded too specifically in 4.4u/4.4v -- Bob deferred the exact
toggle key (TAB/Ctrl+TAB/other) to decide later; both items now say so
and 4.4v's interception scope is keyed off "whatever key gets chosen"
instead of hardcoded to TAB.

Added an explicit six-step breakpoint/punch list after 4.4v recording
the dependency-ordered resume sequence for tomorrow: pin 4.4u's open
numbers, redo 4.4n's CANVAS math, decide the toggle key, build 4.4v,
draw the scroll box's border, then build 4.4r.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

FABRIC.md

@@ -5819,11 +5819,17 @@ document and committing that amendment as its own item.*
      All REPL output/scrollback history (4.4q) renders inside this box. **Not yet drawn** —
      4.4t confined content to this rect but never stroked a visible border on it.
   7. **Above the box: nothing, by default** — reserved blank space, no permanent content.
-  8. **The toggle (4.4r) is bound to the TAB key.** Toggling hides the box's contents; at that
+  8. **The toggle (4.4r) is bound to a meta key — exact key not yet decided** (candidates
-     point the box's own footprint *and* the blank space above it become one unified, full
+     floated: TAB, Ctrl+TAB, or something else; Bob deferred picking one, 2026-08-11 — "we'll
+     figure out what meta keys we wanna use for that part later"). Whatever key it ends up
+     being, it flips the same "flipping" behavior: toggling hides the box's contents, and at
+     that point the box's own footprint *and* the blank space above it become one unified, full
      CANVAS free-play area for vector/graphics work. Toggling again restores the box and its
      scrollback content undisturbed. **The REPL strip (steps 1-4) is never covered by this —
      toggle state only ever affects the box and the space above it, never the bottom strip.**
+     4.4v's keyboard-bridge work needs to intercept *whatever* key is chosen before it reaches
+     the line buffer, not specifically TAB — don't hardcode TAB-interception logic assuming
+     this is locked.
   **Colors, decided explicitly:** REPL strip characters — **bright white** (`0xFFFFFF`,
   `FB_ANSI_PALETTE[15]`). The two horizontal lines bounding the REPL strip — **gray** (exact
   shade not yet pinned to a specific palette index or RGB triple; use a mid-gray consistent
@@ -5887,10 +5893,11 @@ document and committing that amendment as its own item.*
   confirm which `i8042.c` actually captures, don't assume — plus `virtio_input.c`'s `EV_KEY`
   codes for aarch64/riscv64, both need a table); `sk_readline()` gains a second poll path
   alongside its existing serial read, merging both sources into the same line buffer (matches
-  the "merged serial+keyboard source" language already on record from the 4.3.5 entries); TAB
+  the "merged serial+keyboard source" language already on record from the 4.3.5 entries);
-  specifically needs to be intercepted *before* it reaches the line buffer as a character, and
+  whatever meta key 4.4u eventually settles on for the toggle (TAB/Ctrl+TAB/other — not decided
-  routed to whatever the 4.4r toggle word ends up being, not inserted as a literal tab
+  yet, see 4.4u step 8) needs to be intercepted *before* it reaches the line buffer as a
-  character.
+  character, and routed to the 4.4r toggle word instead of inserted literally — the interception
+  mechanism should be keyed off "the chosen toggle key," not hardcoded to TAB specifically.
   *Done when:* typing at a real (or QEMU-emulated) keyboard produces the same REPL behavior as
   serial injection does today, on all three architectures, verified by QEMU boot with a
   keyboard event injected via QEMU's own input-send-event monitor command (not socat/serial),
@@ -5898,6 +5905,29 @@ document and committing that amendment as its own item.*
   CLAUDE.md.
   *Refs:* §27.8, 4.3.5 series, 4.4r, 4.4u, `docs/lithosananke/ROADMAP.md` M8 section.
 
+  > **Session breakpoint, 2026-08-11 night — punch list for resume, not a new item.** Nothing
+  > below this line is implemented; recorded so "continue" tomorrow picks up exactly here
+  > instead of re-deriving it. In order:
+  > 1. **Pin 4.4u's still-open numbers with Bob**: exact gray RGB for the REPL-strip border
+  >    lines (currently just "a mid-gray, not chosen"); reconcile the "~255/256 char" REPL
+  >    input-line width against the real `INPUT_BUFFER_SIZE`=1025 (CLAUDE.md); confirm the
+  >    15px/15px REPL-strip gaps and 8px box gap are final, not just the current mockup
+  >    working values.
+  > 2. **Redo 4.4n's CANVAS-rectangle math** once 4.4u's real (much smaller than 96px) strip
+  >    height is pinned — this is arithmetic against already-known numbers, not a new design
+  >    question, but must happen before any drawing code touches CANVAS sizing.
+  > 3. **Decide the toggle meta-key** (TAB/Ctrl+TAB/other) — explicitly deferred by Bob
+  >    2026-08-11, needed before 4.4v's interception code can be written.
+  > 4. **Build 4.4v** (keyboard→REPL bridge) — scancode/EV_KEY→ASCII tables, second poll path
+  >    in `sk_readline()`, meta-key interception. Three-arch verified via QEMU's
+  >    `input-send-event` monitor command, not socat/serial injection (that would only prove
+  >    the REPL side works, not the keyboard side).
+  > 5. **Draw the scroll box's visible border** (4.4t confined content to the rect but never
+  >    stroked a line on it — small, separable from 4.4v).
+  > 6. **Build 4.4r** (hide/show toggle) — depends on 1-5 above being real, not just planned.
+  > None of steps 1-6 has code yet. Do not skip ahead per §25.0 rule 1 — this order is also the
+  > dependency order, not an arbitrary preference.
+
 - [ ] **4.5 — URGENT, flagged by Captain Bob 2026-08-11: the kernel build has never used any
   compiler optimization.** **Blocking priority, set by Captain Bob 2026-08-11: no other
   punch-list item is worked until 4.5a–4.5f are done**, ahead of whatever would otherwise