feat(linkedin-studio): N16 — out-of-network-andel + patterns-oppdatering + boundary-map [skip-docs]

Reach-splitten (in/out-of-network) er native i LinkedIns post-analytics siden juni
2026, men vises som PROSENT og finnes ikke i CSV-eksporten. Planen antok to
manuelle antall; verifiseringen viste prosent, så modellen er ett felt —
outOfNetworkPct — og in-network er komplementet.

- parseOptionalPercent: egen parser, ikke parseOptionalCount. Komma er desimal
  (36,5 -> 36.5, aldri 365), og verdi >100 avvises: i én kolonne kan ikke et
  absolutt antall skilles fra en andel, så svaret er unknown, ikke en gjetning.
  Blank/ikke-numerisk/negativ -> unknown; ekte 0 beholdes.
- Ett lagret halvpart, kryssjekket: In-network godtas og lagres som komplement;
  et transkribert par som ikke summerer til ~100 (±1 avrunding) forkastes som
  unknown i stedet for å bli halvveis trodd.
- weightedOutOfNetworkPct: impressions-vektet roll-up (avgOutOfNetworkPct, uke +
  måned). Flatt snitt lar en 50-visnings-post slå en på 10 000; poster uten
  avlesning ekskluderes, og null vekt gir undefined — aldri 0, aldri NaN.
- Reach inngår ALDRI i engagementRate (distribusjon != engasjement). Rapporten
  leser den som akvisisjon (ut) vs resonans (inn), og sier «ikke ført for denne
  perioden» framfor å estimere. En reach-innsikt går inn i N15s do-next-kanal.
- Step 7c (A2-F11): rapporten tilbyr diff mot brukerens engagement-patterns.md
  med eksplisitt go — aldri stille skriving, aldri inn i den shippede malen.
- Boundary-map (E#9): dwell eksplisitt umålbar, saves partner-gated, reach
  native men CSV-eksport uverifisert.
- Reach-frie importer er byte-identiske med før, på skjerm og på disk.

TDD: rødt bevist først (10 feilende), analytics 119 -> 144 tester, tsc ren.
test-runner 232 -> 247 (Section 16w, gulv 213 -> 228). Alle suiter grønne.
CHANGELOG: N15-oppføringen manglet og er backfilt sammen med N16.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QxvWAjte7vPcF79QeSRvRJ

scripts/analytics/tests/fixtures/reach-both-export.csv

@@ -0,0 +1,4 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks","In-network","Out-of-network"
+"Both halves transcribed and they sum to 100 - consistent, out-of-network wins...",2026-02-28,2900,70,22,9,130,63%,37%
+"Both halves transcribed but they contradict each other - refuse to guess which one is right...",2026-02-27,2800,70,22,9,130,63%,20%
+"Both halves with rounding slack - 62 + 37 = 99 is within the one-point tolerance...",2026-02-26,2700,70,22,9,130,62%,37%

scripts/analytics/tests/fixtures/reach-edge-export.csv

@@ -0,0 +1,5 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks","Out-of-network"
+"Non-numeric out-of-network cell - the user jotted a note, not a share; stays unknown...",2026-03-06,3500,70,22,9,130,n/a
+"Above 100 - most likely an absolute impression count pasted into a share column; undecidable, so unknown...",2026-03-05,3400,70,22,9,130,1234
+"Negative share - not a real reading; stays unknown...",2026-03-04,3300,70,22,9,130,-5
+"Exactly 100 - a real reading: every impression came from outside the network...",2026-03-03,3200,70,22,9,130,100

scripts/analytics/tests/fixtures/reach-export.csv

@@ -0,0 +1,5 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks","Out-of-network"
+"An out-of-network share the user read off the native Discovery panel, with a percent sign...",2026-03-10,5000,100,30,15,200,37%
+"A post where the user left the Out-of-network cell blank - unknown, not zero...",2026-03-09,3000,60,20,8,120,
+"Explicit zero out-of-network - a real reading: nothing left the network...",2026-03-08,4000,80,25,10,150,0
+"A share written with a European decimal comma - 36,5 percent, not 365...",2026-03-07,2000,40,10,5,60,"36,5"

scripts/analytics/tests/fixtures/reach-in-network-export.csv

@@ -0,0 +1,3 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks","In-network"
+"The user transcribed the in-network half of the split instead - out-of-network is the complement...",2026-03-02,3100,70,22,9,130,63%
+"In-network blank - neither half known...",2026-03-01,3000,60,20,8,120,