symbiont: gitignore Cargo.lock — living harness re-resolves, never pins

Encodes the operator's reframe at the file level: the golden image is a living
integration harness, not a frozen snapshot. Committing Cargo.lock would pin the
git-deps to revs; the harness must re-resolve to each fork's canonical branch
tip every build. Supersedes the INTEGRATION_PLAN R2 "commit the lock" item.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CcpLeEC3XK8Eye53GKBVvi

Author: claude

crates/symbiont/.gitignore

@@ -0,0 +1,7 @@
+# Living integration harness — do NOT commit Cargo.lock.
+# Pinning the lock would freeze the git-deps to specific revs (the snapshot
+# anti-pattern the operator explicitly rejected). The harness must re-resolve to
+# each fork's canonical branch tip on every build, so the binary always reflects
+# the CURRENT substrate. See EPIPHANIES E-GOLDEN-IMAGE-IS-A-LIVING-HARNESS.
+/Cargo.lock
+/target