fix(ci): seal 14th fix-forward — revert cmd_over_fetch partial_success flip

CI on 83b4b68 failed: test_w809_over_fetch_empty_corpus_partial_success_bool_present
asserts `partial_success is False` on empty corpus — the wave-1 A W805
Pattern-2 sweep over-applied the "disclose empty state" rule to
cmd_over_fetch by flipping partial_success=True on empty_corpus /
no_php_models branches.

W809's contract (sealed by task #907 finding "no Pattern 2 gap") is:
empty corpus → 0 real leaks → partial_success MUST be False. Over-fetch
is legitimately a "0 leaks = healthy" check, not a missing-data Pattern-2
case. The new `detector_state` field on the envelope ("empty_corpus" /
"no_php_models" / "scanned") provides the right disclosure mechanism —
flipping partial_success was redundant AND contract-violating.

Reverted the `if w805_empty_state is not None: partial_success = True`
flip. Kept the detector_state field + verdict text changes (those still
add real signal). Tests/test_w809_over_fetch_empty_corpus.py: 5/5 pass.

Author: Cranot

src/roam/commands/cmd_over_fetch.py

@@ -1434,15 +1434,14 @@ def over_fetch_cmd(ctx, threshold, limit, leaks_only, persist):
         # don't break. The summary carries the headline counts so agents
         # can read the verdict line and skip the full envelope.
         # Pre-existing partial_success semantic (leaks present) is
-        # preserved for back-compat. W805 layers an additional
-        # detector-input-state field (`detector_state`) for the
-        # empty-input case + flips partial_success on empty-input
-        # branches per the canonical Pattern-2 convention. The legacy
-        # `state` ("ok"/"leak") is preserved unchanged so existing
-        # consumers don't break.
+        # preserved for back-compat. W805 added detector-input-state
+        # disclosure via the `detector_state` field for the
+        # empty-corpus / no-PHP-models cases — partial_success stays
+        # False on those branches because 0 real leaks is genuinely
+        # healthy (W809 pins this contract: empty corpus → 0 real
+        # leaks → partial_success MUST be False). The legacy `state`
+        # ("ok"/"leak") is preserved unchanged.
         partial_success = bare_count > 0 or unguarded_relation_count > 0
-        if w805_empty_state is not None:
-            partial_success = True
         click.echo(
             to_json(
                 json_envelope(