Add issue templates that route disclosure away from public threads

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Something returned the wrong answer, failed, or contradicted its own receipt.
+labels: ["bug"]
+
+body:
+  - type: markdown
+    attributes:
+      value: >-
+        **Stop if this involves provenance or personal data.** A forged or
+        missing citation, a wrong `retrieved_at`, or anything exposing an
+        individual person is a security issue — report it privately through
+        [security advisories](https://github.com/citature/.github/security/advisories/new)
+        rather than here. Everything else belongs in this form.
+
+  - type: input
+    id: surface
+    attributes:
+      label: Tool or actor
+      description: The MCP tool name or the Apify actor, as you called it.
+      placeholder: follow_the_money · govcon-recompetes
+    validations:
+      required: true
+
+  - type: textarea
+    id: input
+    attributes:
+      label: What you ran
+      description: The exact arguments or actor input. Redact nothing — these are public records.
+      render: json
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: What you expected, and what you got instead
+    validations:
+      required: true
+
+  - type: textarea
+    id: receipt
+    attributes:
+      label: The receipt
+      description: >-
+        Paste the receipt envelope from the answer if you have it — the citation,
+        `retrieved_at`, and match provenance. It is usually the fastest route to
+        the cause, because it says which upstream file the answer came from.
+      render: json
+    validations:
+      required: false
+
+  - type: dropdown
+    id: source
+    attributes:
+      label: Which source does this touch?
+      multiple: true
+      options:
+        - FEC
+        - USASpending
+        - SAM.gov
+        - Grants.gov
+        - Not sure
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+  - name: Vulnerability, provenance, or personal-data concern — report privately
+    url: https://github.com/citature/.github/security/advisories/new
+    about: >-
+      Do not open a public issue. Anything that could let a citation, retrieval
+      timestamp, or source locator be forged, and anything involving personal
+      data, goes here privately. See SECURITY.md for scope.
+
+  - name: Incorrect data in a federal source
+    url: https://github.com/citature/.github/issues/new?template=bug.yml
+    about: >-
+      If a government source itself published something wrong, that is an
+      upstream data issue rather than a citature bug. File it as a bug report
+      and it will be documented as a coverage caveat.