refactor: act on the fallow audit

Unused exports it found that my own sweep missed, because I had grepped
by name and these names occur as local variables elsewhere: deadline and
the Deadline type in util/time.ts were genuinely unreferenced and are
gone; isWireMessage, resolveUserDataDir, CLEAR_SELECTION_LABEL and the
ExpandableText type are used only inside their own file and no longer
export. isWireMessage became internal when server.ts moved to the shared
serialize/deserialize codec.

Duplication: console-buffer and network-buffer were the same
capacity-bounded map with an overflow flag, sharing eviction, the
drain tail and clear() across three clone groups. That is now
cdp/record-store.ts, with tests — neither buffer had any. The three
Network follow-up events also repeated the same decode-and-find preamble;
one `update` helper covers them, and drops the redundant optional
chaining that survived a `!id` guard. formatBytes existed verbatim in
js.ts and network.ts; it is now util/bytes.ts. Duplication overall:
2.7% to 2.0%, and none of the remainder is in src.

.fallowrc.json records the two entry points the tool cannot infer — the
pi extension (declared under pi.extensions) and the daemon (spawned by
path) — without which five reachable files read as dead. sharp is
ignored because it is loaded through a variable specifier in a dynamic
import so it can stay optional. agentDir is exported solely for a test's
dynamic import, so it is suppressed by name rather than globally
enabling ignoreExportsUsedInFile, which would have hidden four of the
five findings above.

Not acted on: the "split high-impact file" suggestions for session.ts,
client.ts and ref-resolve.ts (119 LOC) are size and fan-in heuristics
with no defect behind them, and splitting them would add the indirection
this refactor set out to remove. The claim that state.ts is 100% dead is
an artifact of the missing entry point.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 3 insertions, 21 deletions

diff --git a/src/cdp/console-buffer.ts b/src/cdp/console-buffer.ts
index 53dd6c2..9718603 100644
--- a/src/cdp/console-buffer.ts
+++ b/src/cdp/console-buffer.ts
@@ -1,4 +1,5 @@
 import { decodeEvent } from "./events";
+import { createRecordStore } from "./record-store";
 
 export type ConsoleLevel = "log" | "info" | "warn" | "error" | "debug";
 
@@ -111,21 +112,10 @@ const formatStackTrace = (
 };
 
 export const createConsoleBuffer = (capacity = 500): ConsoleBuffer => {
-  const records = new Map<number, ConsoleRecord>();
+  const records = createRecordStore<number, ConsoleRecord>(capacity);
   let nextSeq = 1;
-  let overflowed = false;
-
-  const evictOldestIfFull = (): void => {
-    while (records.size >= capacity) {
-      const oldest = records.keys().next();
-      if (oldest.done) return;
-      records.delete(oldest.value);
-      overflowed = true;
-    }
-  };
 
   const insert = (rec: ConsoleRecord): void => {
-    evictOldestIfFull();
     records.set(rec.seq, rec);
   };
 
@@ -187,20 +177,12 @@ export const createConsoleBuffer = (capacity = 500): ConsoleBuffer => {
         matched.push({ ...r });
       }
 
-      const total = matched.length;
-      const limit = Math.min(filter.limit ?? 50, 500);
-      const limited = matched.slice(-limit);
-
-      const bufferOverflowed = overflowed;
-      overflowed = false;
-
-      return { records: limited, total, bufferOverflowed };
+      return records.page(matched, filter.limit);
     },
 
     clear() {
       records.clear();
       nextSeq = 1;
-      overflowed = false;
     },
   };
 };