ARCH-02: the harness was red on every fresh install, and a third control says so

A store the add-on has never written has no latch and no history. The DEV-02
migration still runs on it - `schema_version` is absent, so `from_version` is 0 -
and it writes `sign_tripped = False` and `sign_reason = ""` under `inverter-a`
before `build_roster()` exists. On a declared roster nothing reads either of
them, so the first draft called both STRANDED and exited 1. Every fresh install
that grows a second inverter would have been reported as a failed transition.

⚠️ THAT IS A DEFECT IN THE ALARM, NOT A CASE TO SUPPRESS, and store.py already
carries the distinction it needed: `MigrationReport.lost` reports a dropped
`sign_tripped=True` and NOT a dropped `sign_tripped=False`, because "absent" and
"never tripped" are the same statement - and because an alarm that fires on the
harmless case is one an operator learns to dismiss before the real one arrives.
The stranded check now makes the same split, on the VALUE and not on the key
name: a key stranded at its default is printed under its own heading, visibly,
and is not a finding; the same key stranded at a non-default still is. SAFETY-44
turns on `sign_tripped = True`, so it is untouched, and a check pins both
halves against each other so the softening cannot widen into a hole.

CONTROL-C is the fresh install, and it is a third clean control rather than a
line in a comment: the shipped code is right about it and the harness must say
nothing. It is the control that found this.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwRLw7eKYj2byVdwB6kbjU

goodwe_controller/test_rehearse.py

@@ -142,9 +142,18 @@ print("2. THE CLEAN CONTROLS: two transitions on which the shipped code is "
 #   CONTROL-B  a store that has already run flat under 0.7.0 (schema stamped,
 #              no latch), onto a roster named `garage`/`shed`. This is the
 #              MAINT-05 half, and the names are deliberately not `inverter-a`.
+#   CONTROL-C  a FRESH INSTALL - an empty state file - onto `garage`/`shed`.
+#              ⚠️ THIS ONE FOUND A DEFECT IN THE HARNESS. A fresh store's
+#              migration writes `sign_tripped = False` and `sign_reason = ""`
+#              under `inverter-a` before any roster exists, and the first draft
+#              reported both as STRANDED - red on every fresh install. Losing a
+#              DEFAULT loses nothing; that is `MigrationReport.lost`'s own
+#              distinction, and an alarm that fires on the harmless case is one
+#              an operator learns to dismiss before the real one arrives.
 CONTROLS = {
     "CONTROL-A": ("state-legacy.json", "roster-inverter-a.yaml"),
     "CONTROL-B": ("state-flat-070.json", "roster.yaml"),
+    "CONTROL-C": ("state-fresh.json", "roster.yaml"),
 }
 
 
@@ -379,6 +388,22 @@ print("6. THE REVERSE DIRECTION: the retreat, and the return from it")
 # --------------------------------------------------------------------------- #
 code_r, out_r = run(HERE, "state-flat-070.json", "roster.yaml",
                     "--reverse", "--round-trip")
+# ⚠️ AND THE SOFTENING IS NOT A HOLE. The SAME key stranded with a NON-default
+# value is still a finding - that is the whole of part 5 - so the two cases are
+# separated by the VALUE and not by the key name.
+_fresh_code, _fresh_out = run(HERE, "state-fresh.json", "roster.yaml")
+check("a fresh install DOES strand `unit/inverter-a/sign_tripped` - the key is "
+      "written and nothing on the roster reads it - and the report SAYS SO",
+      _fresh_code == RR.EXIT_OK
+      and "unit/inverter-a/sign_tripped = False" in _fresh_out)
+check("...and does NOT call it a finding, because the value is the default; "
+      "the same key at True is the finding part 5 turns on, so the two cases "
+      "are separated by the VALUE and not by the key name",
+      "STRANDED STORE KEY: unit/inverter-a/sign_tripped" not in _fresh_out
+      and "STRANDED STORE KEY: unit/inverter-a/sign_tripped = True"
+      in "\n".join(l.strip() for l in
+                    run(HERE, "state-legacy.json", "roster.yaml")[1].splitlines()))
+
 _orphaned = set(re.findall(r"ORPHANED ENTITY: (sensor\.\S+)", out_r))
 print(f"      the retreat orphans: {sorted(_orphaned)}")
 check("the RETREAT is rehearsed at all, and it reports the entities it "