PKG-13: the no-op half of the pre-deploy check has never run as documented

⚠️ THE INVOCATION ON PKG-09's CARD AND IN THE TOOL'S OWN DOCSTRING RUNS ONLY
HALF THE CHECK. The container runs as uid 0 against a checkout owned by the
operator, and git refuses that:

    fatal: detected dubious ownership in repository at '/w/goodwe-addon'

`_git` returned non-zero, `last_version_change()` returned None, and the
silent-no-op check - THE REASON PKG-09 EXISTS - reported SKIPPED. Measured, on
the documented command against release/1.0:

    ⚠️  SKIPPED: could not ask git what changed since the last bump;
                 the no-op check is INCONCLUSIVE, not clean
    NOT CLEARED

and with `--user $(id -u):$(id -g)`, unchanged otherwise:

    no runtime change since the last bump - nothing to deploy
    CLEARED for deploy.

⚠️ THE TWO HALVES WERE MUTUALLY EXCLUSIVE ACROSS THE TWO DOCUMENTED
ENVIRONMENTS. In the container the validator ran and git skipped; on a bare host
git ran and the validator skipped on aiohttp. NEITHER DOCUMENTED COMMAND RAN
BOTH. The pre-0.9.0 clearance was sound only because it happened to be driven as
two separate invocations.

⚠️ AND IT WAS INVISIBLE IN THE ONLY CASE ANYONE HAD RUN. `main()` consults the
git result only when `shipped == deployed`; every real run so far compared 0.7.0
against 0.9.0 and printed its verdict without ever needing git.

FIXED IN `_git()` WITH `safe.directory`, NOT BY DOCUMENTING `--user`. The tool
should be correct however it is invoked rather than requiring every future
caller to remember a flag; the read is read-only, on a repository the operator
is about to deploy from.

⚠️ WHY THE TESTS COULD NOT SEE IT, WHICH IS THE FINDING BEHIND THE FINDING.
`test_version_gate.py` invokes the gate with `sys.executable` against fixtures
it creates as its own uid, so no fixture could ever meet an ownership mismatch.
MUTATION.md habit 4 in a fourth shape, inside the file written to prevent it -
after the pickaxe bug, after the one-bump history, after the filter-only
survivor. Two fixtures added:

  - a directory that is NOT a git repository, so the lookup genuinely fails:
    the gate must exit 2 saying INCONCLUSIVE and must NOT say CLEARED.
  - ⚠️ THE EXIT CODES PINNED BY VALUE, NOT BY TRUTHINESS. `returncode != 0` is
    satisfied by collapsing NOT-CLEARED into REFUSED, which review found the
    earlier draft could not tell apart. 1 says "this deploy is wrong"; 2 says
    "nobody checked". Driven: collapsing 2 into 1 now goes red on exactly that
    check.

Suite: 26 files, all pass.

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

goodwe_controller/test_version_gate.py

@@ -231,6 +231,44 @@ check("...and because config.yaml IS a runtime path, that cosmetic commit is "
       r8.returncode == 1 and "COSMETIC" in r8.stdout)
 
 
+print()
+print("⭐ A GIT LOOKUP THAT GENUINELY FAILS - THE SHAPE NO FIXTURE COULD REACH")
+# ⚠️ EVERY FIXTURE ABOVE CREATES ITS OWN REPOSITORY AS ITS OWN UID, so none of
+# them could ever meet the failure that actually happened: the documented
+# invocation runs the container as uid 0 against a checkout owned by the
+# operator, git refuses with "detected dubious ownership", `_git` returns
+# non-zero, and the no-op half reports SKIPPED. It degraded honestly - exit 2,
+# never a false clearance - but the check this file exists for had never once
+# run in its documented form, and nothing here could see that.
+#
+# `_git` now sets `safe.directory`, so ownership no longer breaks it. This
+# section grades the REMAINING failure mode: git answering not at all.
+root5 = tempfile.mkdtemp(prefix="test_version_gate.nogit.")
+tmpdirs.append(root5)
+addon5 = os.path.join(root5, "goodwe_controller")
+os.makedirs(addon5)
+write(addon5, "config.yaml", 'name: t\nversion: "0.7.0"\n')          # NOT a git repo
+
+check("a repository git cannot answer for reports no last-bump commit",
+      last_version_change(root5) is None)
+
+r9 = run_gate(addon5, root5, "0.7.0", opts_file(VALID))
+check("⭐ AND THE GATE DOES NOT CLEAR ON IT. An unanswerable git lookup is "
+      "INCONCLUSIVE, not clean - the one thing it must never do is call a "
+      "tree it could not inspect deployable",
+      r9.returncode != 0 and "CLEARED for deploy" not in r9.stdout)
+check("...it says INCONCLUSIVE in those words", "INCONCLUSIVE" in r9.stdout)
+
+# ⚠️ AND THE EXIT CODES ARE PINNED BY VALUE, NOT BY TRUTHINESS. `returncode != 0`
+# is satisfied by collapsing NOT-CLEARED into REFUSED, which review found the
+# earlier draft could not tell apart. 1 and 2 mean different things to an
+# operator: 1 says "this deploy is wrong", 2 says "nobody checked".
+check("NOT CLEARED is exactly 2, not merely non-zero", r9.returncode == 2)
+r10 = run_gate(addon3, root3, "0.7.0", opts_file(dict(VALID, slew_w=1000)))
+check("REFUSED is exactly 1, not merely non-zero",
+      r10.returncode == 1 and "REFUSED" in r10.stdout)
+
+
 print("\nthe shipped tree's own version is readable")
 check("shipped_version() finds a version", bool(shipped_version(HERE)))