docs: retro for code review + AI Literacy Course ordering fix

[hal-eisen-adfa]

Retrospective and process-doc updates from the 2026-07-01 session (high-effort code review on PR #31 + the AI Literacy Course ordering fix in #36).

What changed

CLAUDE.md

• New Git workflow section: always work on a branch (never commit to main); git fetch and compare against origin/main before any diff-against-main. A stale local main caused a /code-review this session to flag 3 findings outside the actual PR diff.
• New One-time on-device install markers subsection: any change to extraction or post-extraction generation (e.g. CourseShell.generate()) must bump CourseInstaller.INSTALL_VERSION, or existing installs skip the work and the fix has no on-device effect.
• Expanded Asset downloads: a bare assemblePlugin does not run downloadAssets and silently ships a broken .cgp when assets (e.g. pdfjs.zip) are missing — verify assets before trusting the .cgp.

docs/process/learnings.md

• New "Plugin build & install gotchas" section covering the two traps above.

docs/process/retrospective.md

• New 2026-07-01 entry: time breakdown, observations, feedback, and actions.

Why

Encodes three pieces of session feedback so they don't recur: branch discipline, fetch-before-diff, and bumping INSTALL_VERSION alongside generation-logic changes (which cost a device round-trip this session).

Docs-only; no code or plugin behavior changes.

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