fix(permissions): param-aware DIS dead-allow + CNF conflict matching

The DIS scanner collapsed Tool(param) rules to the bare tool name, so
Agent(model:opus) deny + Agent(model:sonnet) allow (and the same for
WebFetch(domain:...)) were flagged as dead config — a false positive now
that CC 2.1.178 matches Tool(param:value) and 2.1.172 adds domain rules.
The conflict-detector shared the blind spot from the other side: a
wildcard deny like WebFetch(domain:*) did not cover a
WebFetch(domain:good.com) allow, so a genuine cross-scope conflict was
missed (false negative).

New shared scanners/lib/permission-rules.mjs:
- parseRule / paramMatches (glob)
- dominates(deny, allow) -> DIS dead-allow (deny fully covers allow)
- rulesIntersect(a, b)   -> CNF cross-scope conflict (match sets intersect)

DIS now delegates to dominates; conflict-detector :156 delegates to
rulesIntersect. A bare deny still covers all params, so true positives
are preserved (Bash deny + Bash(npm:*) allow still flagged).

Re-seeded the marketplace-medium snapshots: the false-positive CA-DIS
finding (Read(src/**) allow + Read(./.env) deny) is correctly gone. This
changes snapshot CONTENT only — envelope schema is unchanged, so --json
and --raw stay byte-stable.

Full suite: 837/837 green (+25). self-audit PASS, A(100)/A(97).

tests/fixtures/param-conflict-project/.claude/settings.json

@@ -0,0 +1,6 @@
+{
+  "permissions": {
+    "allow": ["WebFetch(domain:good.com)", "Agent(model:sonnet)"],
+    "deny": []
+  }
+}

tests/fixtures/param-conflict-project/.claude/settings.local.json

@@ -0,0 +1,6 @@
+{
+  "permissions": {
+    "allow": [],
+    "deny": ["WebFetch(domain:*)", "Agent(model:opus)"]
+  }
+}

tests/fixtures/param-qualified-permissions/.claude/settings.json

@@ -0,0 +1,6 @@
+{
+  "permissions": {
+    "allow": ["Agent(model:sonnet)", "WebFetch(domain:good.com)", "Bash(npm:*)"],
+    "deny": ["Agent(model:opus)", "WebFetch(domain:evil.com)", "Bash"]
+  }
+}