PR #22774 evidence: Codex usage reader scans <CODEX_HOME>/archived_sessions (issue 7090). All fixture data SYNTHETIC.
Environment: machine fs-17, Linux 6.1.102 x64, node v24.22.1, captured 2026-10-22T11:30:48.610Z
Before SHA: 6490a9e8748aef55d04d3f4f61b77fba90b4cf1b (merge-base, detached worktree /tmp/ev-22774/before)
After SHA:  74be12a8e614402deeead0d491b4ff2108713724 (fix/issue-7090 head = evidence-script commit)
Code under test (After): 0ce8d724854b38d51812f9beeaf3e6ab0485c937 (74be12a8e6 adds only apps/server/scripts/evidence/codex-archived-usage/*)
Driver: node apps/server/scripts/evidence/codex-archived-usage/run.mjs <repo> <outDir> <basePort>  (committed copy from 74be12a8e6 used for both runs)
Per row: fresh fixture + fresh T3 home + fresh server process, HOME=<row>/home, settings.json providerInstances.codex {enabled:false, config.homePath=<row>/codex}.
Call: WS server.getUsageSummary {sinceDay: today-29, untilDay: today, timeZone: UTC, awaitRefresh: true} via desktop bootstrap -> /oauth/token -> /api/auth/websocket-ticket.
Tokens = uncachedInput + cachedInput + cacheCreation + output over codex buckets. Ports: Before 47710-47716, After 47720-47726.
Alive = server process had not exited and still answered HTTP after the RPC (GET / -> 503, no web bundle built; same on both sides).

Row | Fixture                                  | Before tokens/sessions | After tokens/sessions | Before alive | After alive | Error B|A
A   | active a(120) only                       | 120/1                  | 120/1                 | true         | true        | none|none
B   | active a(120) + archived b(360)          | 120/1                  | 480/2                 | true         | true        | none|none
C   | archived b(360) only, sessions/ empty    | 0/0                    | 360/1                 | true         | true        | none|none
D1  | B + archived record total_tokens<in+out  | 120/1                  | 480/2                 | true         | true        | none|none
D2  | B + archived truncated JSON line         | 120/1                  | 480/2                 | true         | true        | none|none
D3  | B + archived file chmod 000 (999/1)      | 120/1                  | 480/2                 | true         | true        | none|none
D4  | B + archived subdir chmod 000 (999/1)    | 120/1                  | 480/2                 | true         | true        | none|none

Codex sources per row (dir status scanned/skipped/malformed sessions "message"):
A Before: sessions ok 1/0/0 1
A After:  sessions ok 1/0/0 1 ; archived_sessions missing 0/0/0 0 "No transcript directory on this environment."
B Before: sessions ok 1/0/0 1
B After:  sessions ok 1/0/0 1 ; archived_sessions ok 1/0/0 1
C Before: sessions ok 0/0/0 0
C After:  sessions ok 0/0/0 0 ; archived_sessions ok 1/0/0 1
D1 Before: sessions ok 1/0/0 1
D1 After:  sessions ok 1/0/0 1 ; archived_sessions partial 1/1/1 1 "1 malformed or inconsistent usage record(s) were skipped; usage may be incomplete."
D2 Before: sessions ok 1/0/0 1
D2 After:  sessions ok 1/0/0 1 ; archived_sessions ok 1/1/0 1
D3 Before: sessions ok 1/0/0 1
D3 After:  sessions ok 1/0/0 1 ; archived_sessions partial 1/1/0 1 "1 transcript path(s) could not be read; usage may be incomplete."
D4 Before: sessions ok 1/0/0 1
D4 After:  sessions ok 1/0/0 1 ; archived_sessions partial 1/0/0 1 "1 transcript path(s) could not be read; usage may be incomplete."

What else changed between Before and After:
- Every After row reports a second codex source, archived_sessions; Before reports only sessions.
- Row A After: archived_sessions status missing, "No transcript directory on this environment." (dir absent). Totals unchanged at 120/1.
- Row D1 After: archived_sessions partial, skipped 1, malformed 1, "1 malformed or inconsistent usage record(s) were skipped; usage may be incomplete." Before never sees the file.
- Row D2 After: archived_sessions stays ok with skippedFiles 1, malformed 0, no message (invalid JSON is dropped silently, by design).
- Rows D3/D4 After: archived_sessions partial, "1 transcript path(s) could not be read; usage may be incomplete." The locked 999/1 rollout is excluded. D3 counts skippedFiles 1; D4 (readdir failure) counts skippedFiles 0.
- The sessions source is identical in every row on both sides.
- No RPC error, no UsageReadError, no server exit in any of the 14 calls; driver stderr empty for both runs.
- Server logs: each of the 14 logs has exactly one warning, the same on both sides ("Resource telemetry operation 'refresh' failed."), unrelated to usage.
- Scope: only codex buckets/sources were compared; other providers point at an empty fake HOME.

Raw results (JSON lines):
--- before.jsonl
{"row":"A","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"B","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"C","error":null,"codexTokens":0,"codexSessions":0,"sources":[{"dir":"sessions","status":"ok","scannedFiles":0,"skippedFiles":0,"malformedRecords":0,"distinctSessions":0,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D1","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D2","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D3","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D4","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
--- after.jsonl
{"row":"A","error":null,"codexTokens":120,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"missing","scannedFiles":0,"skippedFiles":0,"malformedRecords":0,"distinctSessions":0,"message":"No transcript directory on this environment."}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"B","error":null,"codexTokens":480,"codexSessions":2,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"C","error":null,"codexTokens":360,"codexSessions":1,"sources":[{"dir":"sessions","status":"ok","scannedFiles":0,"skippedFiles":0,"malformedRecords":0,"distinctSessions":0,"message":null},{"dir":"archived_sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D1","error":null,"codexTokens":480,"codexSessions":2,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"partial","scannedFiles":1,"skippedFiles":1,"malformedRecords":1,"distinctSessions":1,"message":"1 malformed or inconsistent usage record(s) were skipped; usage may be incomplete."}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D2","error":null,"codexTokens":480,"codexSessions":2,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"ok","scannedFiles":1,"skippedFiles":1,"malformedRecords":0,"distinctSessions":1,"message":null}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D3","error":null,"codexTokens":480,"codexSessions":2,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"partial","scannedFiles":1,"skippedFiles":1,"malformedRecords":0,"distinctSessions":1,"message":"1 transcript path(s) could not be read; usage may be incomplete."}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}
{"row":"D4","error":null,"codexTokens":480,"codexSessions":2,"sources":[{"dir":"sessions","status":"ok","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":null},{"dir":"archived_sessions","status":"partial","scannedFiles":1,"skippedFiles":0,"malformedRecords":0,"distinctSessions":1,"message":"1 transcript path(s) could not be read; usage may be incomplete."}],"serverAliveAfterCall":true,"httpStatusAfterCall":503}