feat: add TimeOfDayEnhancer post-processor (#52)

* feat: add TimeOfDayEnhancer post-processor

Rule-based feed post-processor that reranks items
by time period, day type, and calendar proximity.

New package: @aris/feed-enhancers

Co-authored-by: Ona <no-reply@ona.com>

* fix: clamp boost values to [-1, 1]

Additive layers can exceed the documented range.

Co-authored-by: Ona <no-reply@ona.com>

* fix: use TimeRelevance consts instead of strings

Co-authored-by: Ona <no-reply@ona.com>

---------

Co-authored-by: Ona <no-reply@ona.com>

packages/aris-feed-enhancers/package.json

@@ -0,0 +1,17 @@
+{
+	"name": "@aris/feed-enhancers",
+	"version": "0.0.0",
+	"type": "module",
+	"main": "src/index.ts",
+	"types": "src/index.ts",
+	"scripts": {
+		"test": "bun test src/"
+	},
+	"dependencies": {
+		"@aris/core": "workspace:*",
+		"@aris/source-caldav": "workspace:*",
+		"@aris/source-google-calendar": "workspace:*",
+		"@aris/source-tfl": "workspace:*",
+		"@aris/source-weatherkit": "workspace:*"
+	}
+}