harness(p0): add VERSION marker + OOB recovery script (Tasks 0.5, 0.6)

Safety prerequisites for the P0 rollout, landed BEFORE any sync.sh change so a bad
harness change cannot strand a node. .claude/harness/VERSION (1.0.0) lets a session
detect partial rollout; .claude/scripts/force-pull-raw.sh is a hook-free git rescue
(dry-run by default; --confirm hard-resets to origin/main, saving prior HEAD to a
recovery branch).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/harness/CHANGELOG.md

@@ -0,0 +1,12 @@
+# Harness CHANGELOG
+
+The ClaudeTools harness version marker (`.claude/harness/VERSION`). Bump on every
+fleet-visible behavioral change so a session can detect whether it is running the new
+or old harness during a heterogeneous rollout. See
+`specs/claudetools-harness-optimization/`.
+
+## 1.0.0 — 2026-06-08
+- Task 0.5: VERSION marker established (this file).
+- Task 0.6: out-of-band recovery script `.claude/scripts/force-pull-raw.sh` added.
+- (Earlier) Syncro billing SSOT resolved: `add_line_item` is normal billing; timers are
+  outlier-only (explicit request).

.claude/harness/VERSION

@@ -0,0 +1 @@
+1.0.0