Remove docs/history.md

It had grown past 1,700 lines, too large to be read or kept up. What it held --
what was wrong before a change and what it cost to find -- goes in commit
message bodies now, beside the change. CLAUDE.md says so; the README and the
changelog no longer point at it. It remains in git history.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,9 +5,6 @@ All notable changes to this project will be 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).
 
-The long form, with what was wrong before and how it was found, is in
-[docs/history.md](docs/history.md).
-
 ## [Unreleased]
 
 ## [0.7.0] - 2026-09-18

CLAUDE.md

@@ -154,9 +154,9 @@ addressed to the person using it.
 Every change gets one line under `## [Unreleased]` in [CHANGELOG.md](CHANGELOG.md), in its
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) group: Added, Changed, Deprecated,
 Removed, Fixed or Security. Say it the way someone using ipx would notice it. When there is more to
-say, such as what was wrong before or what it cost to find out, write it up at the top of
+say, such as what was wrong before or what it cost to find out, it goes in the commit message's
-[docs/history.md](docs/history.md), dated. That record has been more useful than the git log more
+body, where `git log` and `git blame` find it beside the change. (There was a long-form
-than once.
+`docs/history.md` until 0.7.0; it grew too large to be useful and was removed. It is in git.)
 
 Cutting a release: rename `[Unreleased]` to `## [X.Y.Z] - YYYY-MM-DD` and open a new empty
 `[Unreleased]` above it, bump `version` in `Cargo.toml`, tag the commit `vX.Y.Z`, and update the

README.md

@@ -63,7 +63,6 @@ The UI is plain HTTP, so put TLS in front of it if it is reachable from outside
 | [docs/sso.md](docs/sso.md) | Signing in through Cloudflare Zero Trust or Authentik |
 | [docs/architecture.md](docs/architecture.md) | How it works: modules, schema, control socket, HTTP API |
 | [CHANGELOG.md](CHANGELOG.md) | What changed, by release |
-| [docs/history.md](docs/history.md) | How it was built, with what was wrong and why |
 | [CLAUDE.md](CLAUDE.md) | Notes for working on the code, including how production is deployed |
 
 ## Tests