chore(specgit): pin the acceptance workflow's specgit CLI to ^0.5.0

npm install -g specgit installs whatever is latest at run time; the CLI
releases multiple times a day, so an unnoticed upstream change could flip CI
acceptance verdicts repo-wide. Caret floor keeps patch/minor fixes while
making the installed floor reproducible. Also restores this repo's bun/npm
harness adaptation that a local 'specgit issue' run (0.5.0) had overwritten
with the pnpm template.

Closes #366

Author: LeXwDeX

.github/workflows/specgit-accept.yml

@@ -31,9 +31,12 @@ jobs:
           node-version: '22'
 
       # This repo is a bun workspace and does not vendor the SpecGit CLI;
-      # install the published CLI instead of building from source.
+      # install the published CLI instead of building from source. Pinned
+      # with a caret floor (#366): the CLI releases multiple times a day and
+      # an unpinned install would let an unnoticed upstream change flip CI
+      # acceptance verdicts repo-wide.
       - name: Install specgit CLI
-        run: npm install -g specgit
+        run: npm install -g specgit@^0.5.0
 
       - name: Wait for sibling checks
         # The verdict must see the OTHER required checks in a terminal

.specgit.yaml

@@ -1,8 +1,7 @@
 version: 1
-delivery: issue350
+delivery: issue366
 context:
   kind: branch
-  branch: feat/350-issue350
+  branch: feat/366-issue366
 issues:
-  - 350
-pr: 365
+  - 366