Fix schema/validation mismatch: add "public" to repos enum in guard-policies

[Copilot]

The repos field in tools.github guard-policies accepted "public" at validation time but the JSON schema only enumerated "all", causing a schema validation error at compile time when users wrote repos: public.

Changes

• pkg/parser/schemas/main_workflow_schema.json: Expanded repos string enum from ["all"] to ["all", "public"]; updated array items description to reflect wildcard pattern support (owner/*, owner/prefix*)

Example

Previously failing frontmatter that now compiles correctly:

tools:
  github:
    repos: public
    min-integrity: none

Renders in the MCP gateway config as expected:

"guard-policies": {
  "allow-only": {
    "min-integrity": "none",
    "repos": "public"
  }
}

[Copilot]

Pull request overview

Aligns the workflow JSON schema with existing guard-policy validation by allowing tools.github.repos: public, eliminating schema validation failures for an already-supported configuration.

Changes:

• Expanded tools.github.repos schema string enum to include "public" alongside "all".
• Updated schema descriptions to document repository pattern support (owner/repo, owner/*, owner/prefix*).

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