chore(pr-3189): remove changelog.md from PR diff

CHANGELOG.md

@@ -6,10 +6,6 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased](https://github.com/gsd-build/get-shit-done/compare/v1.39.1...HEAD)
 
-### Fixed
-
-- **Milestone-archive layout support** — `validate consistency`, `validate health`, and `find-phase` now scan `.planning/milestones/v*-phases/` directories in addition to the flat `.planning/phases/` layout. Projects that have graduated to milestone-archive layout no longer receive spurious W006 "Phase N in ROADMAP.md but no directory on disk" warnings for every active phase. (#3164)
-
 ### Feature
 
 - **Six namespace meta-skills with keyword-tag descriptions** — replace the flat 86-skill
@@ -313,15 +309,6 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
   pre-existing sentinel force-removes the orphan worktree before starting fresh, making
   the agent self-healing across crashes. (#2839)
 
-- **`config-set resolve_model_ids` no longer rejected** — `resolve_model_ids` was
-  documented in CONFIGURATION.md and read by model-resolution paths, but missing from
-  the CJS/SDK `VALID_CONFIG_KEYS` allowlists. Added to both. (#3162)
-- **`config-set workflow._auto_chain_active` no longer emits spurious errors** — this
-  internal runtime-state key is written by `plan-phase`, `execute-phase`,
-  `discuss-phase`, `transition`, and `new-project` workflows via `config-set`, but was
-  excluded from the public allowlist after #2530. A new `RUNTIME_STATE_KEYS` set lets
-  `isValidConfigKey()` accept it without exposing it as a user-settable option. (#3162)
-
 
 ## [1.39.1] - 2026-05-01