style(tui): restore Australis, $background → pure black (v0.6.3)

Reverts v0.6.2's over-correction. The operator clarified: the
complaint was specifically about the APP BACKGROUND going from
black to a shade of blue, not about the cumulative cast across
all Australis dark surfaces. v0.6.2 globally neutralized Ice + Sea
darks → too far.

## v0.6.3 = v0.6.1 palette + $background override only

Restored verbatim from v0.6.1:

  $foreground       #a9bcc3 (Ice white)
  $surface          #373b46 (Sea bright-black, chrome bg)
  $panel            #414751 (Sea dark 30, borders)
  $au-dark-30..60   Australis Sea palette
  $au-bright-70/80  Australis Sea brights
  $au-bright-white  #cce7ec (Ice highlight)
  Aurora accents    bright-blue/cyan/green — verbatim
  Dawn accents      red/yellow — verbatim
  _AU_DEMOTED       #86929d (Sea dark 60)
  _AU_DEMOTED_FAINT #6e7882 (Sea dark 50)

ONE deviation from Australis spec:

  $background  #222531 (Ice black) → #000000 (pure black)

Rationale: Ice black is RGB(34, 37, 49) — blue +44% over red. At
App-wide scale (the dominant fill across the entire screen) the
cumulative cast reads as "the app is blue" even though no single
rect is in the conventional-blue range. Other dark surfaces are
smaller chrome bands where the cool lean reads as character not
background; only $background gets the override.

## What stayed Australis

Every cosmetic element where the operator hasn't pushed back:
identity widget (Aurora bright-blue), pane-name (Aurora bright-cyan),
[done]/[error]/[cancelled] labels (Aurora green / Dawn red/yellow),
focus borders (Aurora blue / accent cyan), demoted telemetry text
(Sea dark-60), placeholder lines (Sea dark-50), Header/Footer chrome
(Sea bright-black bg + Ice white-blue fg), separators (Sea dark-30).

Brand fidelity preserved; only the dominant background surface
neutralized.

## Tests + smoke

241/241 GREEN; ruff clean. Live screenshot export:
- $background = #000000 (230 fill rects — dominant surface)
- $surface = #373b46 (29 fill rects — Australis Sea bright-black)
- Sea panels + dark-50 still present in chrome
- Aurora #6388D8 still primary

Patch bump (v0.6.2 → v0.6.3) — cosmetic refinement; no public-API
change.

persistent-memory.md

@@ -32,9 +32,9 @@ separate dev team rather than an in-tree Worldtree tool.
 
 ## Current state / in-flight
 
-_As of 2026-05-24 (post-v0.6.1 picker contrast + thinking inline):_
+_As of 2026-05-24 (post-v0.6.3 Australis restored, $background → black):_
 
-**Status: v0.6.1 shipped.** Nine core issues complete (`sse_client`
+**Status: v0.6.3 shipped.** Nine core issues complete (`sse_client`
 #1, `sessions` #2, `cli` #3, `tui` #4, `--end-user-id` #5, TUI
 startup error visibility #6, presenter contract semantics amendment
 #12, startup agent picker #8, §5 layout reshape + Tools pane #13)
@@ -51,7 +51,9 @@ Static in the footer (static "Tools" v1; dynamic when more tabs
 land). CLI mode (--send) unaffected by design — INV-018.
 
 Last commits on `main`:
-- v0.6.1 style(tui): kill remaining blue + thinking-current into Thinking pane
+- v0.6.3 style(tui): restore Australis palette, only $background → pure black
+- `d845b20` style(tui): neutralize Australis dark palette — bg no longer blue-tinted (v0.6.2, reverted)
+- `8463eb2` style(tui): kill remaining blue + thinking-current into pane (v0.6.1)
 - `cfee89a` refactor(tui): streaming + turn headers + Thinking pane (v0.6.0)
 - `7106af5` style(tui): UI polish pass — terminal label colors, placeholders (v0.5.1)
 - `ffd22fb` refactor(tui): content-only main pane + Debug tab + chrome dark (v0.5.0)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "ratatoskr"
-version = "0.6.1"
+version = "0.6.3"
 description = "Worldtree Conversation API debug TUI — multi-pane observability dashboard"
 readme = "README.md"
 requires-python = ">=3.12"

src/ratatoskr/tui.py

@@ -68,16 +68,25 @@ from ratatoskr.sse_client import (
 # for primary surfaces; Dawn accents (red/yellow/magenta) used sparingly for
 # terminal-event labels (error/cancelled).
 #
+# **v0.6.3 single deviation from spec**: `$background` is `#000000` (pure
+# black), NOT Australis Ice black `#222531`. The Ice black is RGB(34,37,49)
+# — blue dominant — and at App-wide scale the cumulative cast reads as
+# "the whole app is blue" to operators (even though no single surface is
+# "blue" in the strict-color sense). Pure black for the App background
+# kills that perception. EVERY OTHER Australis value — Aurora accents,
+# Sea darks for chrome (surface/panel), Ice white foreground, Dawn
+# accents — stays verbatim per spec.
+#
 # Mapping to Textual's Theme semantic tokens:
 #   primary    = Aurora blue (#6388D8) — focus rings, active selection.
 #   secondary  = Aurora cyan (#00b1a8) — secondary highlights.
-#   accent     = Aurora bright cyan (#42dcd1) — bright accents (pane-name, prompt echo).
+#   accent     = Aurora bright cyan (#42dcd1) — bright accents.
 #   success    = Aurora green (#16B866) — [done] label.
 #   warning    = Dawn yellow (#e1c631) — [cancelled] label.
 #   error      = Dawn red (#ff491a) — [error] label.
 #   foreground = Ice white (#a9bcc3) — default text.
-#   background = Ice black (#222531) — App background.
-#   surface    = Sea bright black (#373b46) — raised chrome (header/footer/input).
+#   background = pure black (#000000) — App background (v0.6.3 deviation).
+#   surface    = Sea bright black (#373b46) — raised chrome.
 #   panel      = Sea dark 30 (#414751) — borders, separators.
 
 AUSTRALIS_THEME = Theme(
@@ -89,7 +98,7 @@ AUSTRALIS_THEME = Theme(
     warning="#e1c631",
     error="#ff491a",
     foreground="#a9bcc3",
-    background="#222531",
+    background="#000000",
     surface="#373b46",
     panel="#414751",
     dark=True,
@@ -115,9 +124,9 @@ AUSTRALIS_THEME = Theme(
 _AU_SUCCESS = "#16B866"
 _AU_ERROR = "#ff491a"
 _AU_WARNING = "#e1c631"
-_AU_USER_ECHO = "#42dcd1"  # bright cyan — operator's voice
-_AU_DEMOTED = "#86929d"  # dark 60 — demoted telemetry (was bare "dim")
-_AU_DEMOTED_FAINT = "#6e7882"  # dark 50 — empty-state placeholder text
+_AU_USER_ECHO = "#42dcd1"  # Aurora bright cyan — operator's voice
+_AU_DEMOTED = "#86929d"  # Sea dark 60 — demoted telemetry
+_AU_DEMOTED_FAINT = "#6e7882"  # Sea dark 50 — empty-state placeholders
 
 
 # ---- Issue #12 presenter contract semantics amendment -------------------------

uv.lock

@@ -968,7 +968,7 @@ wheels = [
 
 [[package]]
 name = "ratatoskr"
-version = "0.6.1"
+version = "0.6.3"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },