Builds on the channel-resolution foundation. The installer now lets users
flip a module between stable, next, and pinned after install — either
interactively via a "Review channel assignments?" gate, or by flag. Quick
and modify re-installs classify stable upgrades; under non-interactive
flows, patches and minors apply automatically but majors are refused with
a pointer to --pin.
Fallback behavior for GitHub rate-limit / network failures is now cache-
aware: re-installs reuse the recorded ref silently; fresh installs abort
with actionable guidance (set GITHUB_TOKEN or use --next/--pin). Bundled
modules (core, bmm) warn when targeted by --pin or --next so users aren't
left wondering why the flag had no effect.
Install summary labels no longer mangle "main" into "vmain"; next-channel
entries render as "main @ <short-sha>" instead. Bundled modules are now
correctly skipped from all channel prompts and tag-API lookups.
Docs consolidated into a single how-to. install-bmad.md now covers the
interactive flow, the channel model (stable/next/pinned plus the npm
dist-tag axis for core/bmm), the re-install upgrade prompts, the full
flag reference, copy-paste recipes, and troubleshooting. The old
non-interactive-installation.md is reduced to a redirect stub.
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