Move main off the released version

1.0.0 is on Central and cannot be replaced, so a working tree that still builds
1.0.0 coordinates is a hazard rather than a convenience: an accidental
publishToMavenLocal now overwrites the released artifact in a developer's own
~/.m2 with different bytes, and every local build of main claims to be the thing
that shipped.

The version reported by the build did not change with this edit, and that is the
tag substitution working: HEAD still carried v1.0.0, so `git describe` won since
gradle.properties is only the fallback. It reads 1.0.1-SNAPSHOT from this commit
onward, because this commit is the first one that is not the tag.

RELEASING.md said to bump README alongside it, which was ambiguous enough to be
wrong -- the two numbers move in opposite directions. gradle.properties goes
forward to the next snapshot; the README snippets name the version that was just
released, which is what somebody copying them wants.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XRQsssyhNo8aq4h7xASTXu

Author: wolpert

RELEASING.md

@@ -86,14 +86,15 @@ right.
 
 ### Afterwards
 
-Two files carry a version number and both need bumping:
+Two files carry a version number, and they move in opposite directions:
 
-- `gradle.properties` — to the next `-SNAPSHOT`, e.g. `version=1.0.1-SNAPSHOT`
-- `README.md` — the dependency snippets near the top
+- `gradle.properties` — forward, to the next `-SNAPSHOT`: after releasing 1.0.0, `1.0.1-SNAPSHOT`
+- `README.md` — the dependency snippets should name the version you *just released*, not the next one
 
 Nothing enforces either. The first buys that a build from `main` is never mistakable for a build of
 the version that just shipped. The second is what a reader copies, and the Maven Central badge above
-the snippet is there so a stale number is visibly stale rather than quietly wrong.
+the snippet reads the real latest version, so a stale number is visibly stale rather than quietly
+wrong.
 
 ## One-time setup
 

gradle.properties

@@ -10,4 +10,4 @@ org.gradle.parallel=true
 # this after a release, not before one.
 #
 group=com.codeheadsystems
-version=1.0.0-SNAPSHOT
+version=1.0.1-SNAPSHOT