CB-WP-0013-T04: evidence — and a rule about quoting your own cost

CB-EV-0011. Three instruments were wrong; the pass found the third
defect itself and committed the fourth.

The rule this pass should leave behind: an evidence file quotes the
PREVIOUS pass's final cost, not its own. Three for three, all low by a
strikingly consistent ~2/3:

  CB-WP-0009   $6.73 reported ->  $11.31 final
  CB-WP-0011   $4.23 reported ->   $7.02 final
  CB-WP-0012   $8.82 reported ->  $14.52 final

And this time it changed a conclusion. CB-EV-0010 reported the first
priced tier comparison as "0.123 at L against 0.099 at S — 24% more".
The final figures are 0.150 against 0.099 — 51% more. Tier L costs twice
what that comparison claimed. It still deleted a port that would have
been rewritten and found errors of 25x and 85x, so it still looks worth
it, but the price doubled and the file that made the argument could not
have known.

Also closed rather than deferred again: cb-play's "third mode" never
arrived. --serve is a play flag selecting which Policy fills a human
seat; the binary still has two modes, and CB-EV-0010 §6 was wrong.
Carried for two passes, resolved, stopped.

Recorded as a near-miss: an instrument reading that looked impossible
(53 tool calls in 53 responses) turned out to be correct. One
independent re-derivation before writing anything stopped a false
accusation — in the pass whose whole subject is instruments reporting
things that are not so.

gate-review: 0 due, 0 silent, 0 drifted. Every gate in the registry has
a caught entry for the first time.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

workplans/CB-WP-0013-instrument-corrections.md

@@ -2,7 +2,7 @@
 id: CB-WP-0013
 kind: meta
 title: "Two instruments that were wrong, and the record they wrote"
-status: todo
+status: done
 ---
 
 # Purpose
@@ -235,7 +235,7 @@ first one's ratio is the error this task exists to fix. Filed as owed.
 
 ```task
 id: CB-WP-0013-T04
-status: todo
+status: done
 priority: medium
 ```
 
@@ -251,3 +251,21 @@ Also carry the one that is now overdue: **`cb-play` is three modes in one
 binary.** CB-EV-0009 §5 named the third mode as the trigger to reconsider
 the shape, CB-EV-0010 §6 recorded that it had arrived and that the pass
 did not act. Either do it or state why not, and stop carrying it.
+
+**Done 2026-08-02.**
+[CB-EV-0011](../evidence/CB-EV-0011-instrument-corrections.md).
+
+- **The self-quoting rule is proposed.** Three passes have now reported
+  their own cost mid-flight and all three were low by ~2/3 — and this
+  time it changed a conclusion: CB-EV-0010's tier comparison said L cost
+  *24% more* than S; the final figures say **51%**.
+- **`cb-play`'s third mode never arrived.** `--serve` is a *play flag*
+  selecting which `Policy` fills a human seat. The binary still has two
+  modes. CB-EV-0010 §6 was wrong; the item is **closed, not deferred**.
+- **A near-miss recorded**: an instrument reading that looked impossible
+  turned out to be correct, and one independent re-derivation before
+  writing anything stopped a false accusation.
+- **Tier M was the right weight** — one merged document, no separate
+  review, and the pass still found a defect deeper than the one it was
+  declared on, because the finding came from measuring rather than from
+  an extra review round.