fix: CLI/UX batch — ChatConsole errors, curses scroll, skin-aware banner, git state banner (#5974)

* fix(cli): route error messages through ChatConsole inside patch_stdout

Cherry-pick of PR #5798 by @icn5381.

Replace self.console.print() with ChatConsole().print() for 11 error/status
messages reachable during the interactive session. Inside patch_stdout,
self.console (plain Rich Console) writes raw ANSI escapes that StdoutProxy
mangles into garbled text. ChatConsole uses prompt_toolkit's native
print_formatted_text which renders correctly.

Same class of bug as #2262 — that fix covered agent output but missed
these error paths in _ensure_runtime_credentials, _init_agent, quick
commands, skill loading, and plan mode.

* fix(model-picker): add scrolling viewport to curses provider menu

Cherry-pick of PR #5790 by @Lempkey. Fixes #5755.

_curses_prompt_choice rendered items starting unconditionally from index 0
with no scroll offset. The 'More providers' submenu has 13 entries. On
terminals shorter than ~16 rows, items past the fold were never drawn.
When UP-arrow wrapped cursor from 0 to the last item (Cancel, index 12),
the highlight rendered off-screen — appearing as if only Cancel existed.

Adds scroll_offset tracking that adjusts each frame to keep the cursor
inside the visible window.

* feat(cli): skin-aware compact banner + git state in startup banner

Combined salvage of PR #5922 by @ASRagab and PR #5877 by @xinbenlv.

Compact banner changes (from #5922):
- Read active skin colors and branding instead of hardcoding gold/NOUS HERMES
- Default skin preserves backward-compatible legacy branding
- Non-default skins use their own agent_name and colors

Git state in banner (from #5877):
- New format_banner_version_label() shows upstream/local git hashes
- Full banner title now includes git state (upstream hash, carried commits)
- Compact banner line2 shows the version label with git state
- Widen compact banner max width from 64 to 88 to fit version info

Both the full Rich banner and compact fallback are now skin-aware
and show git state.

hermes_cli/banner.py

@@ -5,6 +5,7 @@ Pure display functions with no HermesCLI state dependency.
 
 import json
 import logging
+import os
 import shutil
 import subprocess
 import threading
@@ -189,6 +190,79 @@ def check_for_updates() -> Optional[int]:
     return behind
 
 
+def _resolve_repo_dir() -> Optional[Path]:
+    """Return the active Hermes git checkout, or None if this isn't a git install."""
+    hermes_home = get_hermes_home()
+    repo_dir = hermes_home / "hermes-agent"
+    if not (repo_dir / ".git").exists():
+        repo_dir = Path(__file__).parent.parent.resolve()
+    return repo_dir if (repo_dir / ".git").exists() else None
+
+
+def _git_short_hash(repo_dir: Path, rev: str) -> Optional[str]:
+    """Resolve a git revision to an 8-character short hash."""
+    try:
+        result = subprocess.run(
+            ["git", "rev-parse", "--short=8", rev],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            cwd=str(repo_dir),
+        )
+    except Exception:
+        return None
+    if result.returncode != 0:
+        return None
+    value = (result.stdout or "").strip()
+    return value or None
+
+
+def get_git_banner_state(repo_dir: Optional[Path] = None) -> Optional[dict]:
+    """Return upstream/local git hashes for the startup banner."""
+    repo_dir = repo_dir or _resolve_repo_dir()
+    if repo_dir is None:
+        return None
+
+    upstream = _git_short_hash(repo_dir, "origin/main")
+    local = _git_short_hash(repo_dir, "HEAD")
+    if not upstream or not local:
+        return None
+
+    ahead = 0
+    try:
+        result = subprocess.run(
+            ["git", "rev-list", "--count", "origin/main..HEAD"],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            cwd=str(repo_dir),
+        )
+        if result.returncode == 0:
+            ahead = int((result.stdout or "0").strip() or "0")
+    except Exception:
+        ahead = 0
+
+    return {"upstream": upstream, "local": local, "ahead": max(ahead, 0)}
+
+
+def format_banner_version_label() -> str:
+    """Return the version label shown in the startup banner title."""
+    base = f"Hermes Agent v{VERSION} ({RELEASE_DATE})"
+    state = get_git_banner_state()
+    if not state:
+        return base
+
+    upstream = state["upstream"]
+    local = state["local"]
+    ahead = int(state.get("ahead") or 0)
+
+    if ahead <= 0 or upstream == local:
+        return f"{base} · upstream {upstream}"
+
+    carried_word = "commit" if ahead == 1 else "commits"
+    return f"{base} · upstream {upstream} · local {local} (+{ahead} carried {carried_word})"
+
+
 # =========================================================================
 # Non-blocking update check
 # =========================================================================
@@ -448,7 +522,7 @@ def build_welcome_banner(console: Console, model: str, cwd: str,
     border_color = _skin_color("banner_border", "#CD7F32")
     outer_panel = Panel(
         layout_table,
-        title=f"[bold {title_color}]{agent_name} v{VERSION} ({RELEASE_DATE})[/]",
+        title=f"[bold {title_color}]{format_banner_version_label()}[/]",
         border_style=border_color,
         padding=(0, 2),
     )