ref(dotagents): Gitignore auto-generated files instead of tracking them (#246)

Move `agents.lock` and `.agents/.gitignore` into root `.gitignore`
rather
than tracking them in the repo. Remove the `gitignore = true` setting
from
`agents.toml` since dotagents no longer needs to manage its own
`.gitignore`.

This prepares for the next version of the dotagents spec where these
files
are treated as ephemeral build artifacts rather than committed state.


Agent transcript:
https://claudescope.sentry.dev/share/M04zUTuV5EqzMV9fmW5jb_5-4RgeYBf5_Zf2fooZgqg

Author: gricha

.agents/.gitignore

@@ -39,3 +39,6 @@ coverage/
 # Temporary files
 *.tmp
 *.temp
+# Auto-generated by dotagents — do not commit these files.
+agents.lock
+.agents/.gitignore

.gitignore

@@ -1,6 +1,4 @@
 version = 1
-# Managed skills are gitignored; collaborators must run 'dotagents install'.
-gitignore = true
 agents = ["cursor", "codex", "claude"]
 
 [trust]