docs: retro on docs + CI modern-di mirror PR sequence

[lesnik512]

Summary

Retrospective on the four-PR sequence (#112–#115) that aligned lite-bootstrap's docs publishing and CI shape with modern-di.

Saved at planning/specs/2026-06-09-docs-and-ci-modern-di-mirror-retro.md.

Highlights

• Worked well: "mirror modern-di" as a scope anchor (every decision became match-or-deviate, verifiable with diff); out-of-scope sections flowing into focused follow-up PRs; operator checklist that surfaced already-done DNS/Pages work; spec gap on README links caught by the implementer's grep step.
• Didn't work well: subagent-driven workflow over-engineered for 4-line verbatim edits (corrected mid-flight); heredoc backtick-escape bug repeated twice in one session; spec missed README references — should have grep'd the repo for the old URL at design time, not as a Task 6 side effect.
• Lessons: for any URL migration, grep the whole repo for the old URL at the design stage; calibrate subagent overhead up front; with <<'EOF' heredocs, do not escape backticks; branch before committing planning artifacts.

Process metrics

• Wall-clock: brainstorm → all 4 PRs merged in ~75 minutes
• Zero failed CI runs across the four PRs
• ~75 net new lines + ~50 removed in production code

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