docs(changelog): add CHANGELOG.md to close OpenSSF release_notes (RAN-52)

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Per-tag release notes — including the full beta sequence (`v0.0.1-beta.0` …
+`v0.0.1-beta.46`) — are published on
+[GitHub Releases](https://github.com/RandomCodeSpace/codeiq/releases). This file
+captures the cross-cutting changes that span multiple commits or releases (new
+quality gates, security policy, deploy surface, etc.) — see the GitHub Release
+for that specific tag for the per-commit details.
+
+## [Unreleased]
+
+### Added
+
+- OpenSSF supply-chain wiring — Best Practices project
+  [12650](https://www.bestpractices.dev/projects/12650), live Scorecard at
+  [securityscorecards.dev](https://api.securityscorecards.dev/projects/github.com/RandomCodeSpace/codeiq),
+  manifest at `.bestpractices.json`, README badges. (RAN-46, RAN-52, RAN-57)
+- `.github/workflows/scorecard.yml` — OpenSSF Scorecard analysis on push +
+  weekly cron (Mondays 06:00 UTC), SARIF → Security tab. All actions
+  SHA-pinned per Scorecard `Pinned-Dependencies`.
+- `.github/workflows/security.yml` — consolidated OSS-CLI security stack
+  per RAN-46 path-B board ruling: OSV-Scanner (npm SCA), Trivy (filesystem +
+  Maven + container CVEs + IaC misconfig), Semgrep (SAST: `p/security-audit`
+  + `p/owasp-top-ten` + `p/java`), Gitleaks (secret scan, full git history),
+  jscpd (duplication < 3% on production code), `anchore/sbom-action` (SPDX +
+  CycloneDX SBOM). Six gate-blocking jobs (SBOM is artifact-only).
+- `SECURITY.md` — private vulnerability-disclosure policy, supported-versions
+  table, triage SLAs (acknowledgement < 72 h, initial triage < 7 d), and
+  coordinated-disclosure timeline.
+- `shared/runbooks/` — `engineering-standards.md` (quality gates, code style,
+  branch/commit/PR rules, testing tiers, security stack, build & distribution,
+  documentation), `release.md`, `rollback.md`, `first-time-setup.md`,
+  `test-strategy.md`. SSoT for cross-cutting engineering rules.
+- `scripts/setup-git-signed.sh` — one-shot ssh-signed-commit setup helper.
+- `CLAUDE.md` "Supply-chain observability (OpenSSF)" section — operator-level
+  summary of the Best Practices state, Scorecard baseline + target (≥ 8.0/10
+  stretch with eight checks at max), known floor reductions, and the OSS-CLI
+  stack reference. (RAN-52 AC #7)
+
+### Changed
+
+- Branch protection on `main` requires every commit to be ssh-signed
+  (RAN-46 AC #2). Force-pushes to `main` are rejected; squash-merge from
+  PRs is the only path.
+- Top-level `permissions: read-all` on every GitHub Actions workflow per
+  Scorecard `Token-Permissions`. Per-job permissions opt into narrower
+  writes only where required (`security-events: write` for SARIF upload;
+  `id-token: write` for the Scorecard publish step).
+- Quality gate stack converged to OSS-CLI only: SpotBugs (`mvn spotbugs:check`),
+  JaCoCo coverage (≥ 85% line, project-wide), Semgrep + Trivy + OSV-Scanner +
+  Gitleaks + jscpd from `security.yml`, plus OpenSSF Scorecard as
+  observability. (RAN-46 path-B board ruling.)
+
+### Removed
+
+- SonarCloud, CodeQL (default-setup and workflow-driven), and OWASP
+  Dependency-Check are no longer part of the merge gate. Per the RAN-46
+  path-B board ruling, they are not to be re-introduced without an explicit
+  board reversal — see `shared/runbooks/engineering-standards.md` §5.1.
+
+## [0.1.0] - 2026-03-28
+
+First general-availability cut. See the
+[v0.1.0 GitHub Release](https://github.com/RandomCodeSpace/codeiq/releases/tag/v0.1.0)
+for the full notes.
+
+- 97 detectors across 35+ languages.
+- Three-command pipeline: `index` → `enrich` → `serve`.
+- Read-only REST API (37 endpoints), MCP server (34 tools, Spring AI 2.0
+  streamable HTTP), and React UI shipped inside a single signed JAR.
+- Maven Central coordinates: `io.github.randomcodespace.iq:code-iq`.
+
+## [0.0.1-beta.0] – [0.0.1-beta.46] - 2026-Q1
+
+Pre-GA beta line. Full per-tag notes on
+[GitHub Releases](https://github.com/RandomCodeSpace/codeiq/releases?q=prerelease%3Atrue).
+The beta cadence shipped from `beta-java.yml` on `workflow_dispatch`; each
+beta is an immutable Sonatype Central beta artifact + GPG-signed annotated
+git tag + GitHub pre-release.
+
+[Unreleased]: https://github.com/RandomCodeSpace/codeiq/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/RandomCodeSpace/codeiq/releases/tag/v0.1.0