refactor(linkedin-studio): S31a multiplier-scrub (reference-docs) — unsourced "Nx" reach/format multipliers -> SSOT

Hardening, multiplier class (S31, batch a). Surgical SSOT-reconciliation of
unsourced "Nx" reach/format/growth multipliers asserted as fact in 7 reference
docs. Same discipline as S27/S28/S30: read-and-show -> grep-confirm -> re-grep
final; 8-step interactive gate; operator-approved catalog before edit.

26 edits / 7 files (+32/-32):
- collaborations-guide (10): 10x reach (:3,:476), 2-3x normal (:32), and the six
  per-format "Reach multiplier: Nx" fields (:165/:187/:210/:235/:252/:277) +
  the label-only :292 (no number) folded in for consistency -> "Reach:" with
  directional, no-reliable-multiplier wording.
- linkedin-growth-playbook (10): 3x faster growth (:57/:132), 1.6x reach (:175),
  1.4x engagement (:205), 1.64x poll (:234), the format-multiplier list
  (:246-251 -> SSOT format ranking, numbers dropped), 3.6x respond (:386),
  3x engagements (:422), 5.6x follower growth (:493), 40x search (:636).
- poll-strategy-guide:7 (1.64x), articles-strategy-guide:28-29 (2-3x/10x),
  video-strategy-guide:308 (2-3x distribution), ab-testing-framework:49
  (1.17x-1.6x format multipliers), trajectory:40 (2-3x saves) + :85 (3x).

Vocabulary 1:1 with S30: "tend to / more reach (multiplier unverified)",
"no reliable multiplier", format ranking kept + number dropped -> cite SSOT.

KEPT INTACT: SSOT-backed engagement-order multipliers (save ~= 5x a like,
quality comment ~= 2x a like, ~= 1x baseline). OUT of scope (untouched):
frequency counts (5x5x5, Nx/week), pixel dims, pricing/size-ratio multipliers.

SURFACED -> S31c (descriptive-% subpass, not edited here): growth:58 (130%
follow), growth:177/178 (Buffer 178%/247%), trajectory:39 (30-40%). Flagged
as absolute-figure class outside S31: growth:421/423. Sourcing overclaim to
revisit: growth:492 "Official LinkedIn data".

VERIFY: re-grep residual targets in 7 files -> 0; routed siblings + KEEP intact;
gate scripts/test-runner.sh = 81/0/0 exit 0, counts 29/19/26 + v0.5.0 unchanged.

Push held: origin = open/ (public namespace), STATE.md must not go there;
parked arrow is all-or-nothing pending STATE-placement fix.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016qgzo6rxthw7KuxHjn5vyE

references/collaborations-guide.md

@@ -1,6 +1,6 @@
 # Strategic Collaborations Guide
 
-Collaboration is one of the most underutilized growth accelerators on LinkedIn. Strategic partnerships can 10x your reach and credibility by tapping into complementary audiences.
+Collaboration is one of the most underutilized growth accelerators on LinkedIn. Strategic partnerships can substantially expand your reach and credibility by tapping into complementary audiences.
 
 ---
 
@@ -29,7 +29,7 @@ Collaboration is one of the most underutilized growth accelerators on LinkedIn.
 
 ### Growth Acceleration Data
 
-- Collaborations generate 2-3x normal reach
+- Collaborations tend to generate above-baseline reach (no reliable multiplier)
 - 40-60% of collaborator's engaged audience visits your profile
 - 10-15% conversion to new followers
 - Higher quality followers (already interested in your topics)
@@ -162,7 +162,7 @@ After establishing rapport:
 - **Their post:** "Great conversation with [You] about [topic]. Here's what I shared: [key points]. Their follow-up questions revealed [additional insight]."
 
 **Time investment:** 30-45 minutes total
-**Reach multiplier:** 2-3x
+**Reach:** Above baseline — expands to your collaborator's audience (no reliable multiplier)
 
 **Topic examples:**
 - "How do you approach [common challenge]?"
@@ -184,7 +184,7 @@ After establishing rapport:
 - Both posts link to each other: "My colleague [Name] addresses the technical side brilliantly. Check their perspective + mine for complete picture."
 
 **Time investment:** 1 hour (including coordination)
-**Reach multiplier:** 2-3x
+**Reach:** Above baseline — expands to your collaborator's audience (no reliable multiplier)
 **Benefit:** Shows diverse perspectives, positions you as collaborative thinker
 
 **Format variations:**
@@ -207,7 +207,7 @@ After establishing rapport:
 - Both create content explaining framework from different angles
 
 **Time investment:** 3-5 hours (including creation and coordination)
-**Reach multiplier:** 3-5x
+**Reach:** Above baseline; deeper integration than a single co-post (no reliable multiplier)
 **Benefit:** Creates reusable asset, positions both as thought leaders, deeper integration
 
 **Execution:**
@@ -232,7 +232,7 @@ After establishing rapport:
 - Caption explains collaboration
 
 **Time investment:** 2-3 hours
-**Reach multiplier:** 4-6x (carousels perform well)
+**Reach:** Above baseline (carousels perform well; no reliable multiplier)
 **Benefit:** High-value format, shareable, clear co-creation
 
 ### Format 5: Live Conversation/LinkedIn Live
@@ -249,7 +249,7 @@ After establishing rapport:
 - Promote 3-5 days advance
 
 **Time investment:** 1 hour live + 1 hour prep and promotion
-**Reach multiplier:** 12-24x (LinkedIn Live favored by algorithm)
+**Reach:** Tends to be the strongest of these formats — LinkedIn Live is favored by the algorithm (no reliable multiplier)
 **Benefit:** Real-time engagement, authenticity, captures both audiences simultaneously
 
 **Topics that work:**
@@ -274,7 +274,7 @@ After establishing rapport:
 - All post same week, tag each other, use consistent hashtag
 
 **Time investment:** 2-3 hours (coordination + content creation)
-**Reach multiplier:** 3-4x per collaborator
+**Reach:** Scales with each collaborator (no reliable multiplier)
 **Benefit:** Positions you within community of experts, major visibility spike
 
 ### Format 7: Takeovers
@@ -289,7 +289,7 @@ After establishing rapport:
 "Today [Your Name] is taking over with their perspective on [topic]. [Your bio]. Take it away, [Name]:"
 
 **Time investment:** 1-2 hours
-**Reach multiplier:** Direct exposure to their entire audience
+**Reach:** Direct exposure to their entire audience
 **Benefit:** Credibility transfer, audience introduction, variety for both audiences
 
 ---
@@ -473,4 +473,4 @@ High-performing creators often form informal masterminds:
 
 ## Bottom Line
 
-Strategic collaborations provide 10x more growth acceleration than equivalent time spent creating solo content. Start building genuine relationships with complementary creators now, even if collaboration is months away.
+Strategic collaborations can accelerate growth well beyond equivalent time spent creating solo content (no reliable multiplier). Start building genuine relationships with complementary creators now, even if collaboration is months away.