fix(intents): an ADB-off entry never scans, and a truncated detail is never believed (t21)

The t18 review's three findings, closed with the reviewer's own repro.

F1 (HIGH — the harm was real shells, not a wrong label). `async_scan_intents`
decided between `adb_disabled` and `adb_unavailable` INSIDE `if self._poller is
None:`, so a manager that HELD a poller fell through to the shell loop: with
`adb_enabled: False` and a connected poller the review measured status `fresh`,
one candidate CACHED, and `pm dump com.x …` really sent. The option is a fact
about the ENTRY, so it is now checked once at the top and returns before
anything else — no cache read, no cache write, no shell. The no-poller branch
keeps the OTHER honest answer: with the option ON and nobody to ask, the status
is `adb_unavailable` ("wait or reconnect"), never `adb_disabled` ("go turn the
option on"), because the two have different fixes. Five tests pin it, including
a cache-leak case (a manager with a cached answer whose option is then switched
off answers `adb_disabled`, not the cache) and both statuses with a FORCED scan.

F2 (low, but it fabricated a value that looked real). A capture cut mid-detail
produced `Scheme: "ht` → scheme `"ht` and `Authority: "www.exam` → that
authority, and `_candidate_data` would then prefill the form with a URL no app
can match. Not an injection (everything stays quoted when used), which is
exactly why nothing caught it. `_unquote` now DROPS a value that opens a quote
and never closes it (a lone quote too), so the callers turn it into None: the
candidate survives with its intact action/component and simply carries no
scheme/authority/path — and therefore prefills NO data instead of a broken URL.
A complete quoted value is still read (the anti-overcorrection pin), and the
consequence is pinned at the consumption end too, through the real options-flow
helper.

F3 (low). The floor comment now answers the review in writing, where the next
reader looks: the t18 review's measurement (awaited_calls 6 against a floor of 5,
three other counters within 2) is named, and the verdict is recorded — those ARE
the policy margins (2 for owner-counters because an owner really can be
refactored away, 1 for awaited_calls because six sites cannot carry a percentage
band). The counters were genuinely updated, not dodged: raised to the real sweep
when the code grew (20→24, 70→75, 235→275, 55→63, 1400→1620) and re-derived
twice since (t20 1620→1615, t21 1615→1617 for this unit's blocks).

EVIDENCE THAT THE TESTS PIN THE FIX (not merely pass): the same files were run
against the PRE-fix source (git archive HEAD, a throwaway copy under /tmp) — 9 of
the 11 new tests FAIL there, including the reviewer's repro, which fails with
`assert 'fresh' == 'adb_disabled'`. The two that pass are the deliberate
anti-overcorrection pins: a COMPLETE quoted value is still parsed, and the
no-poller control keeps its own status.

NO REGRESSION: 900 passed / 5 skipped, 901 / 4 with androidtvremote2; the
injection proof, the fixture's candidates with dedup/flagging/order/bound
disclosures, both cache outcomes, the registration round trip through the real
FlowManager, button lifecycle and defaults, the YAML seed rule and §7.1
(supports_response optional, a real return_response call, a no-response call) all
still pass. The strings files are byte-identical (untouched here). Real-HA pattern
collected and RAN 3 files → 74 passed / 0 skipped. Drift exit 0 (1650 blocks).

NOT VERIFIED HERE: the device side remains a scripted double — no real Shield was
asked for its resolver table, so the shell COUNT and the status vocabulary are
what is proven, not real firmware behaviour. No browser either: the form prefill
is asserted on the values the helper returns.

tests/test_intents.py

@@ -404,6 +404,100 @@ class TestRankingAndHonesty:
         assert is_likely_internal(None, "com.x/ConstraintProxy$Foo") is True
 
 
+class TestATruncatedValueIsNotFabricated:
+    """t18/F2: a capture cut mid-value must not yield a PARTIAL value.
+
+    Android prints quoted detail values (``Scheme: "https"``, ``Authority:
+    "www.netflix.com": -1``, ``Path: "PatternMatcher{GLOB: /title.*}"``). A dump
+    truncated inside one of them used to produce ``"ht`` / ``"www.exam`` — values
+    that LOOK real, which ``_candidate_data`` would then turn into a URL the app
+    cannot match. Not an injection (everything stays quoted when used), which is
+    exactly why nothing else caught it: the corrupt value must be distinguishable
+    from a real one, so an unterminated quoted value is DROPPED.
+    """
+
+    #: Every quoted detail cut before its closing quote — the reviewer's cases,
+    #: plus a cut in the middle of the Path matcher.
+    TRUNCATED = (
+        "Activity Resolver Table:\n"
+        "  Schemes:\n"
+        "    https:\n"
+        "      deca7fa com.netflix.ninja/.MainActivity filter fc1\n"
+        '      Action: "android.intent.action.VIEW"\n'
+        '      Scheme: "ht\n'
+        '      Authority: "www.exam\n'
+        '      Path: "PatternMatcher{GLOB: /title\n'
+        "Service Resolver Table:\n"
+    )
+
+    def test_the_partial_values_are_dropped_not_kept(self):
+        [candidate] = parse_activity_resolver_table(self.TRUNCATED)
+
+        assert candidate.scheme is None, "a half scheme is not a scheme"
+        assert candidate.authority is None, "a half host is not a host"
+        assert candidate.path is None, "a half pattern is not a path"
+        assert candidate.path_kind is None
+
+    def test_the_intact_details_survive_and_nothing_carries_a_quote(self):
+        [candidate] = parse_activity_resolver_table(self.TRUNCATED)
+
+        assert candidate.action == "android.intent.action.VIEW", (
+            "the value that WAS complete is still read"
+        )
+        assert candidate.component == "com.netflix.ninja/.MainActivity"
+        for value in (candidate.scheme, candidate.authority, candidate.path):
+            assert value is None or not value.startswith(("'", '"')), value
+
+    def test_an_unterminated_value_at_the_very_end_of_the_input(self):
+        """The last line can be the cut one — the end of input is not a terminator."""
+        cut = (
+            "Activity Resolver Table:\n"
+            "  Schemes:\n"
+            "    https:\n"
+            "      deca7fa com.netflix.ninja/.MainActivity filter fc1\n"
+            '      Scheme: "ht'
+        )
+
+        [candidate] = parse_activity_resolver_table(cut)
+
+        assert candidate.scheme is None
+        assert candidate.authority is None
+        assert candidate.path is None
+
+    def test_a_lone_quote_is_dropped_too(self):
+        cut = (
+            "Activity Resolver Table:\n"
+            "  Schemes:\n"
+            "    https:\n"
+            "      deca7fa com.netflix.ninja/.MainActivity filter fc1\n"
+            '      Scheme: "\n'
+        )
+
+        [candidate] = parse_activity_resolver_table(cut)
+
+        assert candidate.scheme is None
+
+    def test_a_complete_quoted_value_is_still_read(self):
+        """The anti-overcorrection pin: dropping must not eat good values."""
+        intact = (
+            "Activity Resolver Table:\n"
+            "  Schemes:\n"
+            "    https:\n"
+            "      deca7fa com.netflix.ninja/.MainActivity filter fc1\n"
+            '      Action: "android.intent.action.VIEW"\n'
+            '      Scheme: "https"\n'
+            '      Authority: "www.netflix.com": -1\n'
+            '      Path: "PatternMatcher{LITERAL, /browse}"\n'
+            "Service Resolver Table:\n"
+        )
+
+        [candidate] = parse_activity_resolver_table(intact)
+
+        assert candidate.scheme == "https"
+        assert candidate.authority == "www.netflix.com"
+        assert candidate.path == "/browse"
+        assert candidate.path_kind == "LITERAL"
+
 class TestDegradation:
     """A shape we have never seen degrades to NO candidate, never a wrong one."""
 
@@ -848,3 +942,79 @@ class TestTheManagerScan:
         assert len(result.candidates) == INTENT_CANDIDATE_LIMIT
         assert result.truncated is True, "a capped answer never looks complete"
         assert manager.intent_cache.get(NETFLIX).truncated is True
+
+
+class TestAdbDisabledNeverTouchesTheDevice:
+    """t18/F1: an entry whose OPTION says ADB is off must not scan at all.
+
+    The review measured the defect: with ``adb_enabled: False`` and a CONNECTED
+    poller, the scan fell straight through to the shell loop — ``pm dump com.x …``
+    was really sent, one candidate was CACHED, and the status read ``fresh`` (a
+    silent poller made it ``adb_unavailable``, so even the label depended on the
+    wrong thing). "ADB is switched off" is a fact about the ENTRY, so the option is
+    checked once at the top and returns before any shell or cache touch.
+    """
+
+    async def test_a_held_poller_does_not_override_the_option(self):
+        poller = _IntentsPoller(default=NETFLIX_DUMP)  # connected, would answer
+        manager = _manager(poller, adb_enabled=False)
+
+        result = await manager.async_scan_intents(NETFLIX)
+
+        assert result.status == INTENT_SCAN_ADB_DISABLED
+        assert result.answered is False
+        assert result.candidates == ()
+        assert poller.shell_calls == [], "the device was never touched"
+        assert manager.intent_scan_state(NETFLIX) is None, "nothing was cached"
+
+    async def test_a_forced_scan_is_refused_the_same_way(self):
+        poller = _IntentsPoller(default=NETFLIX_DUMP)
+        manager = _manager(poller, adb_enabled=False)
+
+        assert (await manager.async_scan_intents(NETFLIX)).status == (
+            INTENT_SCAN_ADB_DISABLED
+        )
+        forced = await manager.async_scan_intents(NETFLIX, force=True)
+
+        assert forced.status == INTENT_SCAN_ADB_DISABLED
+        assert poller.shell_calls == [], "force does not override the option either"
+        assert manager.intent_scan_state(NETFLIX) is None
+
+    async def test_a_silent_poller_cannot_change_the_status(self):
+        """The review's second half: the LABEL must come from the option."""
+        silent_but_disabled = _manager(_IntentsPoller(default=None), adb_enabled=False)
+
+        assert (await silent_but_disabled.async_scan_intents(NETFLIX)).status == (
+            INTENT_SCAN_ADB_DISABLED
+        )
+        assert silent_but_disabled._poller.shell_calls == []
+
+        # and the mirror image: ADB ON with a silent poller is "could not ask",
+        # never "switched off" — the two have different fixes
+        silent_but_enabled = _manager(_IntentsPoller(default=None), adb_enabled=True)
+        assert (await silent_but_enabled.async_scan_intents(NETFLIX)).status == (
+            INTENT_SCAN_ADB_UNAVAILABLE
+        )
+
+    async def test_a_cached_answer_cannot_leak_out_of_a_disabled_entry(self):
+        """ADB off is answered BEFORE the cache is read — no stale prefill."""
+        poller = _IntentsPoller(default=NETFLIX_DUMP)
+        manager = _manager(poller)
+        first = await manager.async_scan_intents(NETFLIX)
+        assert first.status == INTENT_SCAN_FRESH and first.candidates
+
+        manager.entry.options[CONF_ADB_ENABLED] = False  # the user turns ADB off
+        after = await manager.async_scan_intents(NETFLIX)
+
+        assert after.status == INTENT_SCAN_ADB_DISABLED
+        assert after.candidates == (), "a disabled entry offers no scan answer at all"
+        assert len(poller.shell_calls) == 1, "only the original, permitted scan ran"
+
+    async def test_the_no_poller_control_keeps_its_own_status(self):
+        manager = _manager(None, adb_enabled=True)
+
+        result = await manager.async_scan_intents(NETFLIX)
+
+        assert result.status == INTENT_SCAN_ADB_UNAVAILABLE, (
+            "no poller is not the same fact as the option being off"
+        )