G1: Lift, soft elevation shadows (off by default)

`Lift` (a GUI toggle, capability lift) lifts the focused pane on a
critically damped spring (animation.Spring: closed form, about 240 ms to
settle, velocity kept across retargets, settled = no frames) and floats
notices. The core puts the lift on the regions (Region.lift, on the wire);
the GUI casts from it: a soft shadow is decor, an erf rectangle on one
quad grown by 3 sigma (decor.frag, flag 0x10000000), in the quad's own
space so a track's transform carries it; darken-only, the caster's rect
left alone, alpha pre-warped for linear light and IGN-dithered. Cast last
in its group, so a neighbour's rails and rules darken with its text; a
notice's before its rule. Strength is capped per theme so text over the
darkest shadow keeps min(its contrast, 4.5) (test over the native themes).

Opt-in until the focus lift/dim default is decided. Feel review material:
docs/effects.md. Test-mode PARDES_TEST_SERIES keeps every captured frame.

Shared files touched: pardes.zig (two fields, one nextWake line),
detached/wire.zig (lift on the region), config.zig, builtins.zig
(capability), gui.zig. Not touched: Messages.zig, mouse.zig, tty,
host_io.

1 files changed, 18 insertions, 0 deletions

diff --git a/docs/effects.md b/docs/effects.md
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+# Effects: feel reviews
+
+Each effect of docs/render-pipeline.md §9 lands behind its own switch, off,
+and is kept only after a feel review (§8.4): a frame series on the virtual
+clock, a recording, and a verdict — keep, polish or drop — with one line of
+why. The verdict is the user's.
+
+| effect | switch | state | review material | verdict |
+|---|---|---|---|---|
+| Crt (bundled post pass) | `Crt 0..3` | kept, rewritten (no barrel) | fx-compare stills, live window | kept at the user's live look |
+| Ripple, Glitch | — | removed | live window | dropped by the user after a live look |
+| G1 soft elevation shadows | `Lift` (off) | opt-in until the focus-lift default is decided | frame series + mp4 per theme (forge, acme, dusk): Lift on, a focus switch, a run of quick switches, a notice, Lift off | pending |
+
+Notes on G1: the lift runs on a critically damped spring (§7.2) that settles
+in about 240 ms and keeps its velocity when a quick run of switches retargets
+it; a notice floats on a lift of 1 while Lift is on. The series are the core's
+frames: core animation steps at 62.5 Hz on any display (§7.1), so a 144 Hz
+display shows the same frames, each held for two or three refreshes.