feat(usage): sync Go usage from the official /zen/go/v1/usage endpoint (#130)

.husky/pre-commit

@@ -15,10 +15,9 @@ if ! command -v npx >/dev/null 2>&1; then
 fi
 
 # Zero-tolerance gate on exactly what this change can affect: the staged
-# files plus the files that import them (see scripts/staged-lint.ts). Runs
-# BEFORE formatting so the linter sees the file as written. The full-tree
-# lint (including tests) runs in CI and on demand via `npm run lint`.
+# files plus the files that import them (see scripts/staged-lint.ts). All
+# linters run in CHECK mode only — nothing is ever rewritten or renamed at
+# commit time; a violation blocks the commit with an error and the user
+# fixes it (or runs `npm run format` / `npm run lint:fix`) themselves.
 npx tsx scripts/staged-lint.ts
-
-# Format changed files (code + non-code) after linting passes.
 npx lint-staged

CHANGELOG.md

@@ -6,7 +6,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Added
 
-- _Nothing yet._
+- **`[Usage]` Server-accurate Go meters via the official `/zen/go/v1/usage` endpoint (#130).** The status bar, tooltip, quick-pick and usage webview previously showed locally estimated Session/Weekly/Monthly percentages that drifted from opencode.ai (issue #23) because they missed CLI, cross-device and pre-install usage. The tracker now pulls the official endpoint (upstream anomalyco/opencode#16513, verified live) with the existing Go key on startup and after each request (60s TTL cache): rolling/weekly/monthly percent + reset times are server-computed and account-wide, `spent` is derived from the authoritative percent, and Today/Yesterday + per-session spend stay device-local. Failures (401/403/404/network) fall back to the existing SQLite → tracked estimates. The key is only ever sent as the Authorization header and never logged or persisted. New pure module `src/goUsageSync.ts` with unit tests.
 
 ## [0.5.2] — 2026-08-11
 

README.md

@@ -236,7 +236,14 @@ Per-model reasoning configuration, dynamically enhanced with `reasoning_options`
 
 - **Go Usage Tracker** — real-time burn-rate of OpenCode Go subscription:
   - Tracks **5-hour rolling** ($12), **weekly** ($30), **monthly** ($60) tiers.
-  - Client-side cost calc: token usage × per-model pricing (input/output/cache_read).
+  - **Server-synced meters** — on startup and after each request the tracker
+    pulls the official `/zen/go/v1/usage` endpoint with your Go key, so the
+    Session/Weekly/Monthly percentages and "resets in" timers are
+    account-wide and server-accurate (includes CLI, other devices, anything
+    before the extension was installed). Falls back to local estimates when
+    the endpoint is unreachable or the key/subscription is invalid.
+  - Today / Yesterday and per-session spend stay **device-local** (the API
+    does not return them).
   - Status bar: `Go: 27%·62%·75%` — ⚠ warning when any tier exceeds 80%.
   - Persisted in VS Code `globalState` — survives restarts.
 - **Response usage bar** — latest prompt/output/total/cache summary after each response.

package.json

@@ -381,9 +381,9 @@
     "prepare": "husky"
   },
   "lint-staged": {
-    "*": "prettier --write --ignore-unknown",
-    "*.{js,cjs,ts}": "eslint --fix --max-warnings 0",
-    "*.md": "markdownlint-cli2 --config .markdownlint-cli2.json --fix",
+    "*": "prettier --check --ignore-unknown",
+    "*.{js,cjs,ts}": "eslint --max-warnings 0",
+    "*.md": "markdownlint-cli2 --config .markdownlint-cli2.json",
     ".husky/*": "shellcheck"
   },
   "devDependencies": {