docs: seed CHANGELOG.md (Keep-a-Changelog format) (#142)

## Summary
Adds an initial `CHANGELOG.md` in Keep-a-Changelog format. Recent
commits are bucketed into Added/Fixed/Changed/Documentation/CI from
their conventional-commit prefixes.

Closes **Row-2 Phase 3** of the 2026-05-26 estate tech-debt audit chain
for this repo. The audit
([standards#197](hyperpolymath/standards#197))
flagged 180/279 repos missing CHANGELOG (65% gap).

## Adopting auto-regeneration
For ongoing auto-regeneration, adopt the
[`changelog-reusable.yml`](https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml)
workflow
([standards#206](hyperpolymath/standards#206))
in this repo's CI. Uses the canonical
[`templates/cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

CHANGELOG.md

@@ -0,0 +1,78 @@
+<!--
+SPDX-License-Identifier: MPL-2.0
+SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell (hyperpolymath)
+-->
+
+# Changelog
+
+All notable changes to `verisimiser` will be documented in this file.
+
+This file is generated from conventional commits by the
+[`changelog-reusable.yml`](https://github.com/hyperpolymath/standards/blob/main/.github/workflows/changelog-reusable.yml)
+workflow (`hyperpolymath/standards#206`). Adopt the workflow in this repo's CI to keep this file in sync automatically — see
+[`templates/cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml)
+for the canonical config.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/);
+this project aims to follow [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- feat(codegen): split sidecar DDL by dialect; reject json sidecar (#45) (#133)
+- feat(codegen): split sidecar DDL by dialect; reject json sidecar (#45) (#131)
+- feat(logging): tracing diagnostics with --log-format/--log-level (#51) (#124)
+- feat(codegen): split sidecar DDL by dialect; reject json sidecar (#45) (#129)
+- feat(codegen): parse DDL with sqlparser, drop hand-rolled scanner (#38) (#123)
+- feat(provenance): fork-first-class chain model — ADR-0010 (#31; supersedes #32) (#122)
+- feat(provenance): fork-first-class chain model — ADR-0010 (#31; supersedes #32) (#121)
+- feat(provenance): fork-first-class chain model — ADR-0010 (#31; supersedes #32) (#120)
+- feat(codegen): split sidecar DDL by dialect; reject json sidecar (#45) (#113)
+- feat(provenance): fork-first-class chain model — ADR-0010 (#31; supersedes #32) (#109)
+
+### Fixed
+
+- fix(rhodibot): automated RSR compliance fixes (#135)
+- fix: restore sqlparser dependency and security policy compliance
+- fix(ci): bump a2ml/k9-validate-action pins to canonical (standards#85) (#114)
+- fix(ci): sync hypatia-scan.yml to canonical (kill cd-scanner build drift) (#108)
+- fix(ci): remove duplicate top-level concurrency block in rust-ci
+- fix(ci): CodeQL language-aware detect (replace hardcoded rust) (#105)
+- fix(#26): unify ProvenanceRecord/ProvenanceEntry (#103)
+- fix(provenance): domain-separated, length-prefixed hash over all fields (#88)
+- fix(manifest): TOML parse errors now report filename:line:col (#84)
+- fix(codegen): validate every identifier before interpolation into DDL (#83)
+
+### Changed
+
+- refactor(rename): VQL → VCL + verisimdb → verisim
+
+### Documentation
+
+- docs(readme): rewrite around concerns octad (V-L1-A2) (#99)
+- docs(adr): 0009-build-path — cargo + Containerfile canonical; rest experimental (#97)
+- docs(adr): 0008-contractile-ci — informational only until a real consumer exists (#96)
+- docs(adr): 0007-access-control-model — prefix-typed principals, deny-wins, typed predicate (#95)
+- docs(adr): 0006-simulation-semantics — isolated snapshots + manual merge (#94)
+- docs(adr): 0005-lineage-acyclicity — enforce DAG at write time (#93)
+- docs(adr): 0004-octad-ontology — concerns octad is canonical (#92)
+- docs(adr): 0003-drift-categories — input, distance, threshold per category (#91)
+- docs(theory): provenance threat model (foundational doc for Step 2) (#90)
+- docs: add CONTRIBUTING-DEV.adoc (#74)
+
+### CI
+
+- ci(spark): adopt estate SPARK Theatre Gate (standards#135) (#117)
+- ci: redistribute concurrency-cancel guard to read-only check workflows (#116)
+- ci(rust): rewrite rust-ci.yml so the workflow actually registers (#89)
+- ci: bump actions/upload-artifact SHA to current v4 (#23)
+- ci: bump actions/upload-artifact SHA to current v4 (#18)
+
+## Pre-history
+
+Prior commits to this file's introduction are recorded in git history but not formally classified into Keep-a-Changelog sections. To backfill, run `git cliff -o CHANGELOG.md` locally using the canonical [`cliff.toml`](https://github.com/hyperpolymath/standards/blob/main/templates/cliff.toml) — this is one-shot mechanical work.
+
+---
+
+<!-- This file was seeded by the 2026-05-26 estate tech-debt audit follow-up (Row-2 Phase 3); see [`hyperpolymath/standards/docs/audits/2026-05-26-estate-documentation-debt.md`](https://github.com/hyperpolymath/standards/blob/main/docs/audits/2026-05-26-estate-documentation-debt.md). -->