feat(asm): add PATCH and DELETE /tags/{tag_id} to complete the Tags resource

[dmchaledev]

Problem

The Tags resource was missing two of the four CRUD operations. Users could create and list tags, but there was no way to rename a tag, change its color, or delete it — making tag management effectively read-only after initial creation.

Changes

• PATCH /tags/{tag_id} (updateTag) — update a tag's name and/or color; returns the updated Tag object
• DELETE /tags/{tag_id} (deleteTag) — permanently removes the tag and strips it from all assets it was applied to; returns 204 No Content
• components/parameters/TagId — reusable path parameter (mirrors the existing AssetId pattern)
• Added description fields to listTags and createTag (were previously empty, which triggers Spectral warnings)

Why this is high-leverage

Tags are used to organize and filter assets across the entire ASM inventory. Without update/delete, any typo or color change requires deleting and re-creating the tag at the application level, and stale tags accumulate with no removal path via the API.

Test plan

• CI Spectral lint passes on asm/openapi.yaml
• PATCH /tags/{tag_id} response schema matches Tag component
• DELETE /tags/{tag_id} returns 204 with no body
• TagId pattern (^tag_[a-z0-9]{16}$) matches the example in Tag schema (tag_0001aabbccdd0001)

https://claude.ai/code/session_01J5oRgC1dr2enDMdNx8WxhD

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