fix(hooks): Fix infinite recursion and update templates for Dolt hooks

- Fix computeJSONLHashForHook calling itself instead of computeJSONLHash
- Update hook templates to call `bd hook` (Dolt-aware) instead of `bd hooks run`
- Add documentation for Dolt-specific features (per-worktree state, branch-then-merge)

The `bd hook` command (singular) provides:
- Per-worktree export state tracking for shared Dolt databases
- Branch-then-merge pattern for cell-level conflict resolution
- Hook chaining configuration with timeout support
- Guard against frequent post-checkout firing

Fixes: hq-ew1mbr.9

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/templates/hooks/pre-commit

@@ -7,6 +7,11 @@
 # This shim delegates to 'bd hook pre-commit' which contains
 # the actual hook logic. This pattern ensures hook behavior is always
 # in sync with the installed bd version - no manual updates needed.
+#
+# The 'bd hook' command (singular) supports:
+# - Per-worktree export state tracking
+# - Dolt branch-then-merge pattern for cell-level conflict resolution
+# - Hook chaining configuration
 
 # Check if bd is available
 if ! command -v bd >/dev/null 2>&1; then