ci: retire per-repo add-to-roadmap (superseded by central sweeper)

[hyperpolymath]

ci: remove per-repo add-to-roadmap workflow (superseded by central sweeper)

The roadmap auto-add is now handled centrally by hypatia's roadmap-sync.yml
(one workflow, one secret). This per-repo pilot is redundant; with the
ADD_TO_PROJECT_PAT secret removed it would only fail on every new issue/PR.
Retiring it.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

[github-actions]

🔍 Hypatia Security Scan

Findings: 43 issues detected

Severity	Count
🔴 Critical	0
🟠 High	0
🟡 Medium	43

View findings

[
  {
    "reason": "Repository has 5 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/workflow_audit/missing_timeout_minutes -- Hypatia workflow_audit: missing_timeout_minutes -- 0 day(s) old",
    "type": "CSA001",
    "file": "add-to-roadmap.yml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "src/ui/gossamer/README.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "scripts/ci-tools/Cargo.toml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "scripts/bench-tools/Cargo.toml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "ffi/zig/README.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "docs/reports/audit/audit-2026-04-15-post.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/github-registry.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/github-registry.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 11 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/a2ml-k9.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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