v1.15.1 — what the post-release review caught

The §7.5 reviewer ran against the shipped v1.15.0 tree with the standing numbers
instruction and came back with one doc defect that strands real users plus two shipped
wrong sentences. All fixed; selftest 315 -> 315 (docs-only patch), vitest 232 -> 232.

• Route-B nudge snippet could never fire (INSTALL-ZCODE.md): the escaped-quote form
  fused ENGRAM_HOOK_FORMAT=json and the script path into ONE argv token, so a user who
  followed the doc verbatim got command not found — and on ZCode that failure is
  silent-by-design (plain stdout discarded, run logged failed), i.e. a permanently
  missing nudge while the doc claims it works. The assignment now sits outside the
  quoted path token, the only form every runner pattern in this repo already uses.
• Symlink-loop guard didn't guard the alternate root: the route-B snippet's comment
  offered ~/.zcode/skills but its existence-guard and link target hardcoded
  ~/.agents/skills twice more — following the inline alternative silently lost the
  silent-nesting protection. One $SKILLS variable now decides the root.
• Two shipped sentences were wrong in the reassuring direction: (1) v1.15.0's
  changelog said the new compact matcher re-anchors "everywhere the matcher is read" —
  dsh's own hooks copy (dsh/hooks.json, a bridge template maintained separately)
  still reads startup|resume|clear only; scoped here to the shared file. (2) Port-size
  counts disagreed across three docs ("three things" / "four functional files" /
  neither); replaced with one stated counting rule.
• package-lock.json root version said 1.1.1 against 1.15.x everywhere else — stale
  lockstep metadata shipped publicly since long before this release; synced, but note
  the version-pin selftest still does not cover the lockfile (CI installs via bun).
• Fuzz harness untouched; last-commit fuzz gate re-run clean at 600 × 24600.

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Updating an existing install: refresh the marketplace first, then update —
claude plugin marketplace update engram && claude plugin update engram@engram, then restart (or /reload-plugins). A plain plugin update before the marketplace refresh reports "already current" against the stale cache.
ZCode users: Settings → Plugin Management → Discover → add github.com/nagisanzenin/engram; see INSTALL-ZCODE.md.
npm installers (opencode-engram-learning): publishes after the maintainer's 2FA tap — verify with npm view opencode-engram-learning version.