Adds two auto-generated documentation sections that describe how
feature flags shape the tool surface:
- docs/insiders-features.md gets a per-flag block under its existing
hand-written prose. Each Insiders flag whose tools differ from the
default surface is listed with the full tool schema rendered through
the same writer used for README, so contributors can see exactly what
Insiders Mode adds or changes.
- docs/feature-flags.md is new and gives the same treatment to every
flag in AllowedFeatureFlags (user-controllable flags). It links back
to the Insiders doc for the auto-enabled subset.
Both sections are produced by a single generator that diffs the
flag-on inventory against the default-flagged inventory and reports any
tool that is new or has a different InputSchema/Meta. No reason
classification - just tools and their schemas, kept intentionally
simple so contributors don't have to update the generator when adding
a new flag.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>