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.

server/lib/pricing-constants.js

@@ -0,0 +1,57 @@
+/**
+ * @file Feature-level pricing constants and modifier math, centralized so the
+ * cost calculator stays readable and every rate has one source of truth. These
+ * mirror Anthropic's published pricing page. Per-model token rates live in the
+ * editable `model_pricing` table; the values here are feature/modifier rates
+ * that are uniform across models and therefore kept as code constants.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+// ── Prompt-caching multipliers (relative to base input price) ───────────────
+// Stored model rates already encode these for the standard tier, but fast-mode
+// cache rates are derived from the fast input base using the same ratios, so we
+// keep the multipliers here for that derivation and for documentation.
+const CACHE_READ_MULTIPLIER = 0.1; // cache hit / refresh
+const CACHE_WRITE_5M_MULTIPLIER = 1.25; // 5-minute ephemeral write
+const CACHE_WRITE_1H_MULTIPLIER = 2.0; // 1-hour ephemeral write
+
+// ── Cross-cutting rate modifiers ────────────────────────────────────────────
+const DATA_RESIDENCY_US_MULTIPLIER = 1.1; // inference_geo === "us"
+const BATCH_DISCOUNT_MULTIPLIER = 0.5; // service_tier === "batch" (50% off)
+
+// ── Server-tool surcharges (billed in addition to tokens) ───────────────────
+const WEB_SEARCH_PER_1K_SEARCHES = 10.0; // $10 per 1,000 web_search_requests
+const WEB_FETCH_PER_REQUEST = 0.0; // web fetch has no surcharge — tokens only
+
+// Code execution: billed by container-time, not request count. Transcripts only
+// expose request counts, so we estimate at the documented 5-minute minimum per
+// request. It is FREE when the same request also used web search or web fetch.
+// Each org gets a monthly free allowance; below it, code execution costs $0.
+const CODE_EXEC_PER_HOUR = 0.05; // $0.05 per container-hour beyond the free tier
+const CODE_EXEC_MIN_MINUTES = 5; // 5-minute minimum billed per request
+const CODE_EXEC_FREE_HOURS = 1550; // free hours per org per month
+
+/**
+ * Estimated billable code-execution hours for a bucket.
+ * Returns 0 when the bucket also used web search or web fetch (code execution is
+ * free in that case) or when there were no code-execution requests.
+ */
+function estimateCodeExecHours(codeExecRequests, webSearchRequests, webFetchRequests) {
+  if (!codeExecRequests || codeExecRequests <= 0) return 0;
+  if ((webSearchRequests || 0) > 0 || (webFetchRequests || 0) > 0) return 0; // free with search/fetch
+  return (codeExecRequests * CODE_EXEC_MIN_MINUTES) / 60;
+}
+
+module.exports = {
+  CACHE_READ_MULTIPLIER,
+  CACHE_WRITE_5M_MULTIPLIER,
+  CACHE_WRITE_1H_MULTIPLIER,
+  DATA_RESIDENCY_US_MULTIPLIER,
+  BATCH_DISCOUNT_MULTIPLIER,
+  WEB_SEARCH_PER_1K_SEARCHES,
+  WEB_FETCH_PER_REQUEST,
+  CODE_EXEC_PER_HOUR,
+  CODE_EXEC_MIN_MINUTES,
+  CODE_EXEC_FREE_HOURS,
+  estimateCodeExecHours,
+};