2608 Phase 0: conversion instrumentation + bin/record-baselines

[pftg]

2608 Phase 0 — the two items every later phase depends on

Swarm-built (two isolated worktree agents), coordinator-reviewed, Codex-gated.
Draft on purpose: master is currently owned by another session (Paul,
2026-08-20) — do not merge until cleared.

0.1 Conversion instrumentation

• generate_lead on contact / free-consultation form submit (data-lead-form,
  one-shot per pageview — the form targets _blank and stays populated).
• cta_click with location param: hero / section / blog-index / tag-index /
  article-end via data-cta-location; blog CTA band partial now takes the
  location string as its arg. Follows the contact_cta_click precedent.
• scroll_depth 25/50/75/90 on blog posts only (named to avoid colliding with
  enhanced measurement's built-in 90% scroll).
• Zero visual diff (verified on rendered output); all events build-time guarded
  off localhost like the existing GA block.

Manual GA4 admin steps remaining (property 328508492): un-mark page_view
as key event; mark generate_lead (+ contact_cta_click) as key events;
DebugView pass per 20.01 §0.1.

0.2 bin/record-baselines <glob>...

Closes the CLAUDE.md automation candidate (manual dance done 3× on
2026-08-14). Records, keeps only requested baselines, restores the rest —
including rm-ing created untracked ones; reconciles the tree even when the
test run exits red; NUL-delimited porcelain parsing (space-safe,
--untracked-files=all); --dry-run preview; --linux prints the CI
dispatch instead of recording locally (ARM-drift lesson).

Review trail

core-coder + ruby-coder in isolated worktrees → coordinator 4-eyes (found the
untracked-restore crash) → Codex "ship with fixes": 2 majors (restore-on-
failure, porcelain parsing) + generate_lead one-shot applied; auxclick
scope consciously matched to the existing precedent.

For the master-owning session

test/fixtures/screenshots/macos/desktop/homepage/_clients.png is stale ON
MASTER (Jul 21 recording; card order since changed — fails identically on a
clean master checkout). Not fixed here to avoid crossing lanes:
bin/record-baselines 'macos/desktop/homepage/_clients.png' from this branch
does it in one command once merged.

🤖 Generated with Claude Code

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