feat(nip-25): add reaction schemas

@/tag/emoji.yaml

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+allOf:
+  - $ref: "nips/nip-25/tag/emoji/schema.yaml"

@/tag/external-content-i.yaml

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+allOf:
+  - $ref: "nips/nip-73/tag/i/schema.yaml"

@/tag/external-content-k.yaml

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+allOf:
+  - $ref: "nips/nip-73/tag/k/schema.yaml"

@/tag/reaction-e.yaml

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+allOf: 
+  - $ref: "nips/nip-25/tag/e-react/schema.yaml"

nips/nip-25/kind-17/schema.yaml

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+$schema: http://json-schema.org/draft-07/schema#
+title: kind17
+description: Reaction event referencing external content (NIP-25 + NIP-73)
+allOf:
+  - $ref: "@/note.yaml"
+  - type: object
+    properties:
+      kind:
+        const: 17
+      content:
+        type: string
+        description: Reaction marker such as "+", "-", or an emoji
+      tags:
+        type: array
+        minItems: 1
+        items:
+          allOf:
+            - $ref: "@/tag.yaml"
+            - if:
+                type: array
+                minItems: 1
+                items:
+                  - const: "emoji"
+              then:
+                $ref: "@/tag/emoji.yaml"
+        allOf:
+          - contains:
+              $ref: "@/tag/external-content-k.yaml"
+            errorMessage:
+              contains: "tags must include at least one k tag describing the external content type"
+          - contains:
+              $ref: "@/tag/external-content-i.yaml"
+            errorMessage:
+              contains: "tags must include at least one i tag referencing the external content"
+    required:
+      - kind
+      - tags

nips/nip-25/kind-7/schema.yaml

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+$schema: http://json-schema.org/draft-07/schema#
+title: kind7
+description: Reaction event referencing a nostr event (NIP-25)
+allOf:
+  - $ref: "@/note.yaml"
+  - type: object
+    properties:
+      kind:
+        const: 7
+      content:
+        type: string
+        description: "Reaction marker such as '+', '-', an emoji, or a custom :shortcode:"
+      tags:
+        type: array
+        minItems: 1
+        items:
+          allOf:
+            - $ref: "@/tag.yaml"
+            - if:
+                type: array
+                minItems: 1
+                items:
+                  - const: "emoji"
+              then:
+                $ref: "@/tag/emoji.yaml"
+        contains:
+          $ref: "@/tag/reaction-e.yaml"
+        allOf:
+          - if:
+              contains:
+                type: array
+                minItems: 1
+                items:
+                  - const: "emoji"
+            then:
+              contains:
+                $ref: "@/tag/emoji.yaml"
+        errorMessage:
+          contains: "tags must include an e tag referencing the reacted event"
+    required:
+      - kind
+      - tags

nips/nip-25/tag/e-react/schema.yaml

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+$schema: "http://json-schema.org/draft-07/schema#"
+title: reactionETag
+description: Event reference tag for reaction events (NIP-25)
+allOf:
+  - $ref: "@/tag.yaml"
+  - type: array
+    minItems: 2
+    items:
+      - const: "e"
+      - type: string
+        pattern: '^[a-f0-9]{64}$'
+    additionalItems:
+      anyOf:
+        - type: string
+          pattern: '^(ws://|wss://).+$'
+        - $ref: "@/secp256k1.yaml"
+        - type: string
+          minLength: 1
+    errorMessage:
+      minItems: "e tag must include the event id"

nips/nip-25/tag/emoji/schema.yaml

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+$schema: "http://json-schema.org/draft-07/schema#"
+title: emojiTag
+description: Custom emoji resource reference for reactions (NIP-25 / NIP-30)
+allOf:
+  - $ref: "@/tag.yaml"
+  - type: array
+    minItems: 3
+    maxItems: 3
+    items:
+      - const: "emoji"
+      - type: string
+        minLength: 1
+        pattern: "^[0-9A-Za-z_:+-]+$"
+        description: Shortcode identifying the emoji without surrounding colons
+      - type: string
+        pattern: "^https?://.+"
+        description: HTTPS URL pointing to the emoji image
+    errorMessage:
+      minItems: "emoji tag must contain ['emoji', <shortcode>, <https url>]"
+      maxItems: "emoji tag must contain ['emoji', <shortcode>, <https url>]"

nips/nip-73/tag/i/schema.yaml

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+$schema: "http://json-schema.org/draft-07/schema#"
+title: externalContentIdentifierTag
+description: External content identifier tag (NIP-73)
+allOf:
+  - $ref: "@/tag.yaml"
+  - type: array
+    minItems: 2
+    maxItems: 3
+    items:
+      - const: "i"
+      - type: string
+        minLength: 1
+        description: Identifier or URI for the external resource
+      - type: string
+        pattern: "^https?://.+"
+        description: Optional URL pointing to the external resource
+    errorMessage:
+      minItems: "i tag must be ['i', <identifier>, ...]"

nips/nip-73/tag/k/schema.yaml

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+$schema: "http://json-schema.org/draft-07/schema#"
+title: externalContentTypeTag
+description: External content type identifier tag (NIP-73)
+allOf:
+  - $ref: "@/tag.yaml"
+  - type: array
+    minItems: 2
+    maxItems: 3
+    items:
+      - const: "k"
+      - type: string
+        minLength: 1
+        pattern: "^[A-Za-z0-9][A-Za-z0-9._+-]*(?::[A-Za-z0-9][A-Za-z0-9._+-]*)*$"
+        description: Type identifier for the external resource
+      - type: string
+        minLength: 1
+        description: Optional subtype or hint for the external resource
+    errorMessage:
+      minItems: "k tag must be ['k', <type>, ...]"