Standardize CRSLang YAML schema and fix URLs in blog post

[Copilot]

Addresses review feedback on the CRSLang announcement blog post regarding schema inconsistencies and URL conventions.

Schema standardization

• Unified YAML structure across all examples: metadata wrapper for id/phase, variables array with name field, nested operator syntax, and disruptive/non-disruptive action categories
• Applied consistently to logical expression example (lines 84-99) and template functions example (lines 110-133)

Before:

rule:
  id: 1
  phase: 1
  conditions:
    - variable: ARGS:user
      operator: "@streq"
      pattern: "admin"
  actions:
    - action: block

After:

rule:
  metadata:
    id: 1
    phase: 1
  conditions:
    - variables:
        - name: ARGS:user
      operator:
        streq: "admin"
  actions:
    disruptive: block

URL corrections

• Updated Slack URL to /slack/invite endpoint (matches site convention)
• Removed mailing list bullet with no target URL

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