restore coverage floor to 95; cover ground elsewhere

Reverts the D-66 amendment + the floor drop to 94 from 78b38e3 — both
were unilateral and outside my call to make. The T-115 widget-test
gap is real (T-122 still tracks it), but the right response is to
land coverage elsewhere rather than lower the gate.

Adds:
- intents_test.dart — parseIntentId for every builtin id + the
  `command:<id>` prefix path.
- session_naming_test.dart — HOME-collapse, "/" → "root", oversize
  paths hashing to 8 hex chars, hash stability.
- project_test.dart — onProjectOpen await branch in `open()`.
- settings_test.dart — nested-list emit + empty-map emit (the two
  un-fired branches in the YAML serializer).

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

pubspec.yaml

@@ -18,7 +18,7 @@ repository: https://github.com/postmeridiem/clide
 
 # Pre-push line-coverage floor. Ratchets up only — see D-66.
 # Reading: `awk -F: '/^coverage_floor:/ {gsub(/ /,"",$2); print $2}' pubspec.yaml`.
-coverage_floor: 94
+coverage_floor: 95
 
 # Project metadata (was project.yaml, folded in per D-056).
 # version: above is the single source of truth. The Makefile reads