docs: seed CHANGELOG.md (Keep-a-Changelog format)

[hyperpolymath]

Closes Row-2 Phase 3 of the 2026-05-26 estate tech-debt audit chain for this repo. The 2026-05-26 documentation-debt audit (hyperpolymath/standards#197) flagged that 180 of 279 estate repos lacked a CHANGELOG.md (65% gap) — this seed closes that finding here.

The seed:

• Uses Keep-a-Changelog format with an [Unreleased] section.
• Buckets the most recent 100 commits by conventional-commit prefix (feat/fix/refactor/docs/ci/build) into Added/Fixed/Changed/ Documentation/CI sections.
• References standards#206's changelog-reusable.yml + the canonical templates/cliff.toml for full-regeneration via git-cliff.

The file is initial — the maintainer can adopt changelog-reusable.yml in this repo's CI to keep it auto-regenerated, or regenerate manually.

[github-actions]

🔍 Hypatia Security Scan

Findings: 35 issues detected

Severity	Count
🔴 Critical	1
🟠 High	24
🟡 Medium	10

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/launch-scaffolder/launch-scaffolder",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in scorecard.yml",
    "type": "missing_workflow",
    "file": "scorecard.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "missing_workflow",
    "file": "mirror.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in secret-scanner.yml",
    "type": "missing_workflow",
    "file": "secret-scanner.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in governance.yml",
    "type": "unknown",
    "file": "governance.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in hypatia-scan.yml",
    "type": "unknown",
    "file": "hypatia-scan.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Required file missing (condition: has_dependencies)",
    "type": "missing_requirement",
    "file": ".github/dependabot.yml",
    "action": "create",
    "rule_module": "cicd_rules",
    "severity": "high"
  },
  {
    "reason": "Required file missing (condition: public_repo)",
    "type": "missing_requirement",
    "file": ".github/workflows/scorecard.yml",
    "action": "create",
    "rule_module": "cicd_rules",
    "severity": "high"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/launch-scaffolder/launch-scaffolder/crates/launcher-common/src/template.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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