feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

statusline/statusline.py

@@ -0,0 +1,136 @@
+"""
+statusline.py — Claude Code custom statusline renderer.
+
+Reads a JSON event payload from stdin (emitted by Claude Code on every turn)
+and prints a single ANSI-colored status line to stdout. Renders the model
+display name, current user, working directory (with home collapsed to ``~``),
+active git branch, a color-coded context window usage bar (green / yellow /
+red thresholds), and token counts. Always exits 0 so it can never block
+Claude Code — missing fields are silently skipped.
+
+Intended to be referenced from Claude Code's ``statusLine`` setting (see
+``statusline-command.sh`` for the wrapper) or installed to
+``~/.claude/statusline.py``.
+
+:file: statusline/statusline.py
+:module: Claude-Code-Agent-Monitor.statusline
+:author: Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+:maintainer: Nguyễn Ngọc Trí Vĩ (a.k.a. David Nguyen, smartgift)
+:copyright: (c) 2026 Nguyễn Ngọc Trí Vĩ
+:license: MIT
+:repository: https://git.smartgift.io.vn/Smartgift-AI/Claude-Code-Monitor
+:requires: Python 3.6+
+:encoding: utf-8
+
+@author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+"""
+
+__file_name__ = "statusline.py"
+__module__ = "Claude-Code-Agent-Monitor.statusline"
+__author__ = "Nguyễn Ngọc Trí Vĩ"
+__email__ = "vinnt@smartgift.vn"
+__maintainer__ = "Nguyễn Ngọc Trí Vĩ"
+__copyright__ = "Copyright (c) 2026 Nguyễn Ngọc Trí Vĩ"
+__license__ = "MIT"
+__version__ = "1.0.0"
+__status__ = "Production"
+__repository__ = "https://git.smartgift.io.vn/Smartgift-AI/Claude-Code-Monitor"
+
+import sys
+import json
+import os
+import subprocess
+
+sys.stdout.reconfigure(encoding='utf-8')
+
+CYAN    = '\033[0;36m'
+GREEN   = '\033[0;32m'
+YELLOW  = '\033[0;33m'
+MAGENTA = '\033[0;35m'
+RED     = '\033[0;31m'
+DIM     = '\033[2m'
+RESET   = '\033[0m'
+
+raw = sys.stdin.read().strip()
+if not raw:
+    sys.exit(0)
+
+try:
+    data = json.loads(raw)
+except Exception:
+    sys.exit(0)
+
+parts = []
+
+# Model
+model = (data.get('model') or {}).get('display_name', '')
+if model:
+    parts.append(f"{CYAN}{model}{RESET}")
+
+# User
+user = os.environ.get('USERNAME') or os.environ.get('USER', '')
+if user:
+    parts.append(f"{GREEN}{user}{RESET}")
+
+# CWD — strip home prefix
+cwd = (data.get('workspace') or {}).get('current_dir') or data.get('cwd', '')
+if cwd:
+    home = os.path.expanduser('~')  # C:\Users\nguyens6
+    if cwd.startswith(home):
+        cwd = '~' + cwd[len(home):].replace('\\', '/')
+    else:
+        cwd = cwd.replace('\\', '/')
+    parts.append(f"{YELLOW}{cwd}{RESET}")
+
+# Git branch
+git_dir = (data.get('workspace') or {}).get('current_dir') or data.get('cwd', '')
+if git_dir:
+    try:
+        branch = subprocess.check_output(
+            ['git', '-C', git_dir, '--no-optional-locks', 'symbolic-ref', '--short', 'HEAD'],
+            stderr=subprocess.DEVNULL
+        ).decode().strip()
+    except Exception:
+        try:
+            branch = subprocess.check_output(
+                ['git', '-C', git_dir, '--no-optional-locks', 'rev-parse', '--short', 'HEAD'],
+                stderr=subprocess.DEVNULL
+            ).decode().strip()
+        except Exception:
+            branch = ''
+    if branch:
+        parts.append(f"{MAGENTA}{branch}{RESET}")
+
+# Context bar
+ctx = data.get('context_window') or {}
+used_pct = ctx.get('used_percentage')
+if used_pct is not None:
+    bar_len = 10
+    filled = round(bar_len * used_pct / 100)
+    bar = '█' * filled + '░' * (bar_len - filled)
+    color = RED if used_pct >= 80 else YELLOW if used_pct >= 50 else GREEN
+    parts.append(f"{color}{bar} {used_pct}%{RESET}")
+
+# Tokens
+usage = ctx.get('current_usage') or {}
+in_tok  = usage.get('input_tokens')
+out_tok = usage.get('output_tokens')
+cache   = usage.get('cache_read_input_tokens')
+if in_tok is not None and out_tok is not None:
+    tok_parts = [f"{GREEN}{in_tok}↑{RESET}", f"{CYAN}{out_tok}↓{RESET}"]
+    if cache:
+        tok_parts.append(f"{DIM}{cache}c{RESET}")
+    parts.append(' '.join(tok_parts))
+
+# Session cost (USD) — shown on both API and subscription plans
+cost = (data.get('cost') or {}).get('total_cost_usd')
+if cost is not None:
+    try:
+        cost_f = float(cost)
+        cost_color = RED if cost_f >= 20 else YELLOW if cost_f >= 5 else GREEN
+        parts.append(f"{cost_color}${cost_f:.4f}{RESET}")
+    except (TypeError, ValueError):
+        pass
+
+sep = f"{DIM} | {RESET}"
+print(sep.join(parts))