The phase table folded two steps with very different risk profiles into one
B5: adopting core imports (safe by construction -- the guarded import keeps
the bundled fallback) and deleting the bundled copies (removes the fallback,
so the import becomes a hard dependency). They are now B5 and B6.
Reading the enforcement path showed the declared floor protects nobody today:
- PluginLoader._warn_if_incompatible is advisory, and skips entirely when the
parsed core version is below 2.0.0.
- The v3.1.0 release ships __version__ = "1.0.0" -- the tag was cut
2026-05-31 and the string was not bumped until 2026-07-12 -- so the skip
matches exactly the users most likely to be behind.
- Neither StoreManager.install_plugin nor .update_plugin compares the core
version, so a store update delivers a plugin that floors above the core.
Verified against a v3.1.0 worktree: sports_scroll, element_style and the
sports package are absent there, and the import fails with
exc.name == 'src.common.sports_scroll' -- a guard set of {"src"} does not
match it.
B4 therefore grows to include making the version number trustworthy and
adding the install/update gate; B6 waits on that gate having shipped and
reached users. Also adds an ordered "What's next" and the durable lessons
this migration paid for.
Documentation only; no code changes.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5
