fix(linkedin-studio): S10 — generalize stale-stat lint to the pattern class + permanent non-vacuity self-test

Closes the S9 re-review (1 BLOCKER + 2 MAJOR, all grep-verified). The survivor
set converged 8 -> 6 -> 2; this closes the meta-problem behind the convergence,
not just the two lines.

BLOCKER — references/glossary.md:10: drop the fabricated "150-parameter
foundation model" (a garbled 150B that the S9 enumerative grep/lint, requiring a
"B"/"billion", could not match). Reframe to "a real input to LinkedIn's 2026
relevance-ranking model" with no parameter count, citing
algorithm-signals-reference.md inline — which makes the :12 "Used in" provenance
accurate (the reference does state the relevance-ranking framing; it never stated
"150-parameter").

MAJOR — CHANGELOG.md:308: de-brand "360Brew profile optimization (January 2026
algorithm update)" -> "Profile/topic-relevance optimization". Removes the
unpublishable brand + asserted Jan-2026 date, honouring v4.0.0's "removed
everywhere" claim. It was the only STALE_STATS hit in CHANGELOG.

MAJOR — scripts/test-runner.sh: the rebuilt lint was enumerative on surface form.
Generalize it to the PATTERN CLASS so the same grep that defines the SC fails on
any surface form, present or future:
  - STALE_STATS model token: "150 ?B param|150 billion param"
      -> "[0-9]+[ -]?(B|billion)?[ -]?param"
    (covers 150-parameter / 150B param / 150 billion param). This robustifies the
    review's literal suggestion "[0-9]+[ -]?(B|billion )?param", which missed the
    space form "150B param"; the separator is moved out of the group.
  - STAT_HITS grep scope += CHANGELOG.md (the 360Brew survivor lived outside it).
  - Permanent non-vacuity SELF-TEST before the real scan: 13 forbidden probes must
    match (incl. the exact "150-parameter" survivor), 8 legitimate probes must not
    ("Language parameter", "parameterized", "different parameters",
    "175-milliarders parametermodell", 5x5x5, cadence, pixel dims, "10x your
    reach"). S7->S9 each shipped a green lint because the proof was run by hand and
    never committed; this makes narrowing STALE_STATS fail the suite.

Verification: test-runner.sh 67/0/0 exit 0 (was 66/0/0; +1 self-test);
node --test 94/94; broadened exhaustive grep across the tree -> zero survivors.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/linkedin-studio/CHANGELOG.md

@@ -305,7 +305,7 @@ First formal version. Previously unversioned.
 - 15 specialized agents
 - 8 hooks for workflow automation
 - Analytics system with CSV import
-- 360Brew profile optimization (January 2026 algorithm update)
+- Profile/topic-relevance optimization
 - Content matrix system (40+ post ideas from single topic)
 - Personalization engine
 - 20 reference documents for LinkedIn best practices