Update changelogs

ouroboros-consensus-diffusion/changelog.d/20240220_122811_nick.frisby_bootstrap_gsm.md

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+A new scriv changelog fragment.
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+Uncomment the section that is right (remove the HTML comment wrapper).
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+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+
+### Non-Breaking
+
+- Added `getImmTipSlot` to `NodeKernel` exports.
+
+### Breaking
+
+- Added the Genesis State Machine (GSM), though for now it is merely the
+  simpler [Bootstrap Peers State
+  Machine](https://ouroboros-consensus.cardano.intersectmbo.org/docs/for-developers/BootstrapPeersIER).
+
+- Added `rnGetUseBootstrapPeers` to `RunNodeArgs`, for dynamically
+  enabling/disabling the GSM. The proper GSM must always be running, despite
+  the TVar it owns being ignored when it's disabled, since it may be enabled at
+  any time.
+
+- Added `llrnMaxCaughtUpAge` to the low-level args; defaults to 20min.
+
+- Added `gsmTracer` to the node's tracers.
+
+- Added `getNodeIdlers` to the `NodeKernel` interface; tracking peers that have
+  last sent `MsgAwaitReply`.

ouroboros-consensus/changelog.d/20240220_122808_nick.frisby_bootstrap_gsm.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+
+### Breaking
+
+- Added `cdbsHasFSGsmDB` to the ChainDB args, for the GSM's persistent marker
+  file.
+
+- Added arguments to `bracketChainSyncClient` and `ChainSync.DynamicEnv` for
+  tracking idling peers.
+
+- Added arguments to `readFetchModeDefault` for sensitivity to the GSM state:
+  when using bootstrap peers, simply mimic the GSM state. Otherwise, fall back
+  to the legacy logic.