feat(tui): Configuration pane (pane 8) with LLM / Skills / MCPs tabs (proposal 003 PR-4)

CHANGELOG.md

@@ -50,6 +50,34 @@ tag is the v0.2.0 cut.
   (PR-3.)
 - **`RolesChangedMessage`** public message added to
   `acc/tui/messages.py` (PR-3).
+- **TUI: Configuration pane (pane 8).**  New `ConfigurationScreen`
+  at `acc/tui/screens/configuration.py` with three tabs:
+  *LLM Endpoints*, *Skills*, *MCPs*.  Reachable via the new `8`
+  keybinding from any screen.  (PR-4 of proposal 003 — PR #57.)
+- **TUI: LLM Endpoints tab.**  Shows the configured
+  `ACCConfig.llm` summary (backend, model, base_url, timeout) as
+  read-only text plus a live per-agent table fed from snapshots.
+  *Test connection* button HEAD-pings the configured `base_url`
+  via stdlib `urllib.request` (no new dependency) and surfaces
+  latency + status / unreachable reason.  Writing back to
+  role.yaml under a new `llm_endpoint` key is deferred to a
+  follow-up.  (PR-4.)
+- **TUI: Skills + MCPs tabs (canonical home).**  The Skills and
+  MCP-servers tables (plus their *Upload skill* / *Upload MCP*
+  file-picker flows) now have their canonical home on the
+  Configuration pane.  The Ecosystem copies remain for one
+  release as a migration aid; a follow-up PR will remove them.
+  (PR-4.)
+
+### Changed
+
+- **NavigationBar extended to 8 panes.**  Module docstring + key
+  list + `BINDINGS` updated; every screen's local BINDINGS list
+  now includes `("8", "navigate('configuration')",
+  "Configuration")`.  (PR-4.)
+- **Snapshot fan-out** in `acc/tui/app.py:_apply_snapshot` now
+  pushes the active snapshot into the Configuration screen too,
+  so its live LLM-backends table refreshes per HEARTBEAT.  (PR-4.)
 
 ### Fixed
 

acc/tui/app.py

@@ -35,6 +35,7 @@
 from acc.tui.models import CollectiveSnapshot
 from acc.tui.screens.compliance import ComplianceScreen, _OversightAction
 from acc.tui.screens.comms import CommunicationsScreen
+from acc.tui.screens.configuration import ConfigurationScreen
 from acc.tui.screens.dashboard import DashboardScreen, _RefreshMessage
 from acc.tui.screens.ecosystem import EcosystemScreen
 from acc.tui.screens.infuse import InfuseScreen, _PublishMessage
@@ -79,18 +80,20 @@ class ACCTUIApp(App):
         ("question_mark", "show_help", "Help"),
     ]
 
-    # Seven screens — six biological + PR-B prompt pane (REQ-TUI-003)
+    # Eight screens — six biological + PR-B prompt pane +
+    # proposal-003 PR-4 configuration pane (REQ-TUI-003).
     SCREENS = {
-        "soma":        DashboardScreen,
-        "nucleus":     InfuseScreen,
-        "compliance":  ComplianceScreen,
-        "comms":       CommunicationsScreen,
-        "performance": PerformanceScreen,
-        "ecosystem":   EcosystemScreen,
-        "prompt":      PromptScreen,    # PR-B
+        "soma":          DashboardScreen,
+        "nucleus":       InfuseScreen,
+        "compliance":    ComplianceScreen,
+        "comms":         CommunicationsScreen,
+        "performance":   PerformanceScreen,
+        "ecosystem":     EcosystemScreen,
+        "prompt":        PromptScreen,    # PR-B
+        "configuration": ConfigurationScreen,  # proposal 003 PR-4
         # Legacy aliases so existing code using "dashboard"/"infuse" still works
-        "dashboard":   DashboardScreen,
-        "infuse":      InfuseScreen,
+        "dashboard":     DashboardScreen,
+        "infuse":        InfuseScreen,
     }
 
     def __init__(
@@ -284,6 +287,7 @@ def _apply_snapshot(self, snapshot: CollectiveSnapshot) -> None:
             ("comms", CommunicationsScreen),
             ("performance", PerformanceScreen),
             ("ecosystem", EcosystemScreen),
+            ("configuration", ConfigurationScreen),  # proposal 003 PR-4
         ]
         for screen_name, screen_cls in _SNAPSHOT_SCREENS:
             try:

acc/tui/screens/comms.py

@@ -72,6 +72,7 @@ class CommunicationsScreen(Screen):
         ("5", "navigate('performance')", "Performance"),
         ("6", "navigate('ecosystem')", "Ecosystem"),
         ("7", "navigate('prompt')", "Prompt"),
+        ("8", "navigate('configuration')", "Configuration"),
     ]
 
     snapshot: reactive["CollectiveSnapshot | None"] = reactive(None, layout=True)

acc/tui/screens/compliance.py

@@ -108,6 +108,7 @@ class ComplianceScreen(Screen):
         ("5", "navigate('performance')", "Performance"),
         ("6", "navigate('ecosystem')", "Ecosystem"),
         ("7", "navigate('prompt')", "Prompt"),
+        ("8", "navigate('configuration')", "Configuration"),
     ]
 
     snapshot: reactive["CollectiveSnapshot | None"] = reactive(None, layout=True)