EL0 Overlay App Fleet: 12 DSO Apps + Compositor Scene ABI

sigil-os ships syscall 105 (Direct-Scene Overlay absorption) and sigil-apps ships 12 overlay EL0 demo apps — plus real Lumen libwin apps with full AA typography and rounded chrome. All cap-gated via the broker session slot. (df6c08e + sigil-apps batch)

Z-order overlay demo on x86 — 3-window cascaded compositor proof

Syscall 105: Direct-Scene Overlay (DSO) absorption

The WM compositor accepts EL0 overlay scene submissions via syscall 105. Each submission is a cap-gated scene delta — the EL0 app holds a DSO slot handle from the broker, not the raw compositor token. Three commits build out the DSO ABI:

df6c08e — syscall 105 DSO absorption, slot ownership model
dd42eca — pointer routing to DSO slot owners (z-order-aware hit testing)
d5e9908 — overlay_input_dispatch z-order fix: input goes to the topmost slot, not the first registered

Syscalls 106 and 107 (fb_overlay_raise / fb_overlay_lower) let EL0 apps adjust their z-order slot at runtime — used by ovlz and ovlmulti for the cascaded compositor demo.

The 12 overlay demo apps

App	Description
`ovltext`	Pixel-art 5×7 glyph renderer
`ovlterm`	Mini terminal with pixel-art text input
`ovlclock`	7-segment live tick-counter
`ovlprogress`	Animated progress bar
`ovlsprite`	Bouncing pixel-art sprite
`ovlpalette`	RGB color swatch reference
`ovlgraph`	Integer sine/cosine waveform
`ovlpong`	Pong game in an overlay window
`ovlmatrix`	Matrix rain — 20 columns, fading green trails, 80 frames
`ovlz`	Z-order demo: `fb_overlay_raise`/`lower` syscalls 106/107
`ovlmulti`	3-window cascaded overlay, N-slot Z-order compositor proof
`ovlcalc`	4-function calculator with 7-segment LCD (Director T1+ ③)

ovlmatrix runs 80 frames with 20 columns of cascading green characters; each column has an independent decay timer for fading trails. ovlmulti is the N-slot compositor stress test: three simultaneous overlay windows, each submitted to a different DSO slot, with live z-order cycling.

ovlcalc — 7-segment 4-function calculator in a Lumen overlay

Lumen libwin apps

Four apps use the libwin Lumen scene API — real Lumen AA typography, rounded window chrome, and the full lw_* widget set:

netstat — SRDX 0.6.0 transport panel: live connection badges, TX/RX counters, session cap chip
scope — waveform viewer using Bhaskara I integer sin/cos approximation; no FPU required, Pi3-floor safe
ticker — event ticker with overlay / frame / input / transport badges; shows the compositor event loop in real time
colbrowser (5933838) — Finder-style 3-column Lumen Scene: Locations | grioghar/ readdir(20) | detail+tags+fs_query(91) console. Uses lw_listrow selected highlight, lw_capchip tag chips, lw_console for the fs_tag_list(94)/fs_query(91) syscall transcript

Widget vocabulary across all libwin apps: lw_title, lw_label, lw_value, lw_badge, lw_rule, lw_console, lw_capchip. All render via the Lumen scene ABI — GPU framebuffer first, software-2D fallback for Pi3-floor targets.