Add CHANGELOG.md to both Unity packages (UPM convention)

CultLib 1.0.60: CultInspectorAssetPath removed for CultInspectorAssetGuid +
CultAssetGuidKey (breaking for inspector annotations), and the native QUIC
bridge's Schannel to OpenSSL MsQuic 2.5.9 static-link change shipping since
1.0.59. Caching Studio 1.4.0: the GUID picker, sub-asset keys, built-in
refusal, and the stale-value warning/Clear button. build-unity-package.ps1
only stages files it names explicitly, so it neither drops nor overwrites
these; no script change needed.

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

src/GameCult.Unity/Assets/Caching/CHANGELOG.md

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+# Changelog
+
+All notable changes to this package are documented in this file.
+
+## [1.4.0]
+
+### Added
+
+- `[CultInspectorAssetGuid]` drawer: a `UnityEngine.Object` picker for a
+  string member holding a stable Addressables-shaped asset key — the bare
+  `.meta` GUID for a main asset, or `guid[subAssetName]` for a sub-asset.
+- Sub-asset keys: picking a sub-asset (one sprite of a sheet, say) stores its
+  name alongside the GUID and resolves it back through
+  `AssetDatabase.LoadAllAssetRepresentationsAtPath`.
+- Refusal of Unity's built-in resources: a picked object that is neither a
+  main asset nor a sub-asset under `Assets/` or `Packages/` (Library's
+  built-in default resources, e.g. the LegacyRuntime font or the Cube mesh)
+  is refused rather than stored, since it has no Addressables entry.
+- A stale-value warning when a stored key no longer resolves to an asset,
+  with a Clear button beside it to blank the field without first picking a
+  substitute asset. Drawing never rewrites a stored value on its own.

unity/org.gamecult.cultlib/CHANGELOG.md

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+# Changelog
+
+All notable changes to this package are documented in this file.
+
+## [1.0.60]
+
+### Changed
+
+- Native QUIC bridge: Schannel replaced by OpenSSL MsQuic 2.5.9, statically
+  linked, shipping since 1.0.59 in this package. `msquic.dll` grew from
+  536,928 to 4,181,856 bytes and the bridge from 40,448 to 302,080 bytes as a
+  result of the static CRT and the statically linked OpenSSL build. The
+  bridge keeps its v1 exports on a v2 event-queue runtime. An OpenSSL notice
+  was added under `Third Party Notices`.
+
+### Breaking
+
+- `CultInspectorAssetPath` is removed. Inspector annotations that stored an
+  asset by path now use `CultInspectorAssetGuid`, whose value is a
+  `CultAssetGuidKey`: the bare Addressables GUID for a main asset, or
+  `guid[subAssetName]` for a picked sub-asset.