Adds a single, deliberate exception to the toml-based agents-only filter:
`bmad-help` is the structural meta-skill across BMAD — the orientation
helper that points users at every other skill. Users invoke it
persona-style ("ask the helper") even though it has no `[agent]`
customize.toml of its own (it isn't a configurable persona).
Implemented as a one-element ALWAYS_AGENT_IDS set rather than a hardcode
in the function body so the exception is named, documented, and
discoverable. The skill is structurally unique — there is no second
meta-help skill — so this is not the start of a growing allowlist; it's
a one-off for the one orientation surface BMAD ships.
Verified on disk: agents picker now shows 21 entries (20 personas via
[agent] in customize.toml + bmad-help). bmad-agent-builder stays
correctly excluded (its customize.toml has [workflow], not [agent]).
Tests: extends Suite 17 with a `bmad-help` fixture (no customize.toml,
must still appear in agents picker). 389 tests pass.
Refs #2267
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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