chore(release): publish upgrade-15-rc0 (#9268)

Created by following the [pending
MAINTAINERS.md](https://github.com/Agoric/agoric-sdk/pull/9235/files?short_path=39da3bd#diff-39da3bd6270d44ea37b6ed50bd42eeb9d93ac5e1639645871a69cbe08cbe29de),
branching from dev-upgrade-15.

NOTE:
[scripts/have-news](https://github.com/Agoric/agoric-sdk/blob/master/scripts/have-news)
has an undocumented dependency upon src-prefix="a" that was disrupted by
my local
[`diff.mnemonicPrefix=true`](https://git-scm.com/docs/diff-config/2.9.5#Documentation/diff-config.txt-diffmnemonicPrefix)
configuration, resulting in empty output until I tracked down the issue.
I've opened #9269 to track that.

## Packages that have NEWS.md updates

```diff
--- c/golang/cosmos/CHANGELOG.md
+++ w/golang/cosmos/CHANGELOG.md
@@ -3,6 +3,21 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+## [0.35.0-u15.0](https://github.com/Agoric/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-04-20)
+
+
+### Features
+
+* upgrade zcf: install bundle and call updateZcfBundleId() ([74662d7](74662d7)), closes [#9250](#9250)
+* **cosmos:** Next upgrade is `agoric-upgrade-15` ([6a84bb1](6a84bb1))
+
+
+### Bug Fixes
+
+* various fixes and features for u15 ([21e6f7c](21e6f7c))
+
+
+
 ## [0.35.0-u14.1](https://github.com/gibson042/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-03-12)
 
 
--- c/packages/smart-wallet/CHANGELOG.md
+++ w/packages/smart-wallet/CHANGELOG.md
@@ -3,6 +3,20 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+### [0.5.4-u15.0](https://github.com/Agoric/agoric/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-04-20)
+
+
+### Features
+
+* **smart-wallet:** tryExitOffer reclaims withdrawn payments ([6f01f63](6f01f63))
+
+
+### Bug Fixes
+
+* in SmartWallet, if invitation is invalid, don't process offer ([29078f7](29078f7))
+
+
+
 ### [0.5.4-u14.1](https://github.com/Agoric/agoric/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-03-12)
 
 **Note:** Version bump only for package @agoric/smart-wallet
--- c/packages/vats/CHANGELOG.md
+++ w/packages/vats/CHANGELOG.md
@@ -3,6 +3,15 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+### [0.15.2-u15.0](https://github.com/Agoric/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-04-20)
+
+
+### Features
+
+* upgrade zcf: install bundle and call updateZcfBundleId() ([74662d7](74662d7)), closes [#9250](#9250)
+
+
+
 ### [0.15.2-u14.1](https://github.com/Agoric/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-03-12)
 
 **Note:** Version bump only for package @agoric/vats
--- c/packages/zoe/CHANGELOG.md
+++ w/packages/zoe/CHANGELOG.md
@@ -3,6 +3,15 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+### [0.26.3-u15.0](https://github.com/Agoric/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-04-20)
+
+
+### Bug Fixes
+
+* fix ZCF to not await in first crank ([8e289fd](8e289fd)), closes [#8911](#8911)
+
+
+
 ### [0.26.3-u14.0](https://github.com/Agoric/agoric-sdk/compare/@agoric/[email protected]...@agoric/[email protected]) (2024-02-27)
 
 
```

a3p-integration/package.json

@@ -1,7 +1,7 @@
 {
     "private": true,
     "agoricSyntheticChain": {
-        "fromTag": "use-upgrade-13"
+        "fromTag": "use-upgrade-14"
     },
     "scripts": {
         "build": "yarn run build:sdk && yarn run build:submission && yarn run build:synthetic-chain",
@@ -12,7 +12,7 @@
         "doctor": "yarn synthetic-chain doctor"
     },
     "dependencies": {
-        "@agoric/synthetic-chain": "^0.0.7"
+        "@agoric/synthetic-chain": "^0.0.10"
     },
     "packageManager": "[email protected]",
     "license": "Apache-2.0"