fix(newos4): one error counter for errors/dashboard/world-model (v4.6.61)

Packet 2 (three surfaces, three answers). Measured first: `errors` scanned
/logs/current.log for [ERROR] lines, but that file only ever receives explicit
terminal.log('ERROR', ...) calls -- exactly one call site in the whole app -- so it
read 0. The dashboard added DebugSupervisor._errorDB plus failed tool calls (18),
and the world model read the debug DB alone (11).

- terminal.countErrors() / countLogErrors(): the single counter, exposed on the one
  object all three surfaces already hold
- `errors` prints the canonical total with its breakdown, the entry list (hash,
  count, severity, message), and reports the log scan separately as a mirror
- dashboard health.errors and health.errorBreakdown derive from it
- world model telemetry.recentErrors derives from it, plus errorsBySource
- terminal.log('ERROR', ...) now also records into DebugSupervisor, so the log is a
  human-readable mirror of one store instead of a second store almost nobody wrote

Verified live on v4.6.61: with a seeded debug entry + failed tool call, all three
report 2; a single log('ERROR') call moves debug 1->2 and the total by exactly 1
(the mirror line is counted once, in the log, and reported separately).

1 files changed, 19 insertions, 7 deletions

diff --git a/modules/core/module-system.js b/modules/core/module-system.js
index e7f7e5a..b9b62a6 100644
--- a/modules/core/module-system.js
+++ b/modules/core/module-system.js
@@ -144,13 +144,25 @@
                 // v4.5.43: errors [n] — alias for logs [n] ERROR
                 this.commands['errors'] = (args) => {
                     const n = parseInt(args[0]) || 20;
-                    const content = this.terminal.fs.readFile('/logs/current.log');
-                    if (!content) { this.terminal.print('No logs yet', 'info'); return; }
-                    const lines = content.split('\n').filter(l => l && l.includes('[ERROR]'));
-                    const tail = lines.slice(-n);
-                    if (tail.length === 0) { this.terminal.print('✅ No errors found in logs', 'success'); return; }
-                    this.terminal.print(`--- Errors (last ${tail.length}) ---`, 'error');
-                    tail.forEach(l => this.terminal.print(l, 'error'));
+                    // v4.6.59: read the canonical counter (DebugSupervisor DB + failed tool
+                    // calls) — the same numbers the dashboard and world model publish. The VFS
+                    // log is reported separately because it only receives explicit
+                    // terminal.log('ERROR') calls, so it cannot be the source of truth.
+                    const e = this.terminal.countErrors();
+                    if (e.total === 0) {
+                        this.terminal.print(`✅ 0 errors — debug DB ${e.debug} · failed tool calls ${e.latency} · log ${e.log}`, 'success');
+                    } else {
+                        this.terminal.print(`--- ${e.total} ${e.total === 1 ? 'error' : 'errors'} — debug DB ${e.debug} · failed tool calls ${e.latency} ---`, 'error');
+                        const ds = this.terminal.moduleManager.modules['DebugSupervisorModule'];
+                        const entries = Object.entries((ds && ds._errorDB && ds._errorDB.errors) || {})
+                            .map(([hash, v]) => Object.assign({ hash: hash }, v))
+                            .sort((a, b) => (b.lastSeen || 0) - (a.lastSeen || 0))
+                            .slice(0, n);
+                        entries.forEach(x => this.terminal.print(
+                            (x.hash || '').slice(0, 8) + ' ×' + (x.count || 1) + ' ' +
+                            ((x.severity || '') + ' ' + (x.message || '')).trim(), 'error'));
+                    }
+                    this.terminal.print(`  scope: this browser session · log scan ${e.log} [ERROR] line(s) in /logs/current.log`, 'info');
                 };
 
                 // v4.5.43: doctor — run all health checks, rank issues, show top 3