add v2 breaking release changelog

Author: fajarnugraha37

CHANGELOG.md

@@ -0,0 +1,44 @@
+# Changelog
+
+## 2.0.0 — Token-efficient semantic index
+
+### Breaking
+
+- Removed the v1 monolithic `docgen.mjs` engine.
+- Removed discovery, analyze, semantics, enterprise-pass, enrichment, fix, update-impact, and full re-audit commands/prompts.
+- Removed all custom pipeline agents and parent-to-subagent delegation.
+- Removed legacy auto-enrich, auto-fix, and re-audit configuration.
+- Requires Node.js 22.5+ for built-in `node:sqlite`.
+- Existing v1 repositories must run `docgen migrate`.
+
+### Added
+
+- SQLite/FTS5 semantic index with incremental file hashing.
+- Overlapping source chunks plus deterministic symbol/interface/config/SQL extraction.
+- Bounded content-addressed context compiler.
+- Hard provider call/input/output/per-call budgets.
+- Provider telemetry and stage usage reports.
+- Two-call model synthesis: core and enterprise.
+- Deterministic catalog/reference rendering.
+- Item-level page invalidation.
+- Claim-level traceability generated in the same page invocation.
+- Deterministic FACT/evidence validation.
+- Selective, risk-scored, hash-cached LLM audit.
+- Breaking v1-to-v2 migration with backup and docs/ignore preservation.
+- Node.js 22/24 CI and semantic-index regression suite.
+
+### Changed
+
+- Planning defaults to at most 30 pages unless explicitly configured otherwise.
+- Provider prompts are direct and context-only.
+- Skills remain available for manual Command Code work but are not automatically loaded by the pipeline.
+- Source inventory moved from `.docgen/state` to `.docgen/index`.
+- Publishing and P3 workspace aggregation remain deterministic.
+
+### Removed dead managed files during installation
+
+The installer backs up and removes v1 executable, prompts, agents, and obsolete slash commands from global and project-local installations.
+
+## 1.0.0
+
+P3 system-of-systems workspace release built on the original provider-heavy repository pipeline.