chore(release): bump to 0.28.0

Five fixes were committed and pushed after v0.27.0 and none is reachable:
every entry point on this machine runs the version-pinned plugin cache, not
this tree. This bump is step one of making them reachable - the tag and the
catalog ref follow together via release-plugin.mjs, never one without the
other.

Carries: dot-prefixed repo discovery (3e5add0), the bare-name defect in the
three order-verb emitters (393499c), --to refused on a control character in
both write sides (29a94dd), the FILENAME== focus-filter join (2928c28), and
route_cmd_for reading the rationale instead of the field (b70786d).

Version bumped in all seven places CLAUDE.md's Release section names:
plugin.json, package.json, the README badge, and the frontmatter of
skills/coord-send, skills/board, skills/route, skills/dispatch. CHANGELOG
entry added alongside.

Pre-release gate, all five suites plus npm: coord 230, board 259 (was 252 -
section 23 added 7 checks), route 69, orders 110, guard 40, node 11/11.
Catalog pre-flight run by hand first per the order: 12 plugins, 0 ERROR.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AZa4oEsa93ac6pZQFEXqBF

skills/board/SKILL.md

@@ -20,7 +20,7 @@ description: >-
   user names no repo and no tool — choosing *between* repos is this skill. Not for
   "where were we" inside the current repo: that is this repo's own STATE.md,
   already injected at session start.
-version: "0.27.0"
+version: "0.28.0"
 ---
 
 # board — which repo deserves the next session

skills/coord-send/SKILL.md

@@ -15,7 +15,7 @@ description: >-
   covers retiring a broadcast that has become wrong or obsolete: "retract that
   broadcast", "that announcement is outdated, pull it", "trekk tilbake kringkastingen",
   "den broadcasten er utdatert".
-version: "0.27.0"
+version: "0.28.0"
 ---
 
 # coord-send — natural-language front door for inter-repo messages

skills/dispatch/SKILL.md

@@ -17,7 +17,7 @@ description: >-
   skill. Not for choosing WHICH repo deserves the next session (that is `board`),
   not for scoring model and effort alone (that is `route`), and not for sending a
   message to another repo (that is `coord-send`).
-version: "0.27.0"
+version: "0.28.0"
 ---
 
 # dispatch — hand a session a task it can actually start on

skills/route/SKILL.md

@@ -14,7 +14,7 @@ description: >-
   the operator names no model and no tool — choosing the model for the next
   session IS this skill. Not for choosing which REPO gets the next session:
   that is the `board` skill.
-version: "0.27.0"
+version: "0.28.0"
 ---
 
 # route — what the next session should run with