* fix: pass --branch to tier-check CLI in tier-audit skill
The skill was not forwarding the --branch argument to the tier-check
CLI, causing policy signal checks to always run against the repo's
default branch. Files on feature branches showed as 'Not found.'
Now derives the branch from the local checkout if not explicitly
provided, and always passes it to the CLI.
* fix: exclude draft/extension scenarios from tier-scoring conformance rates
SEP-1730 says date-versioned scenarios count toward tier scoring while
draft and extension scenarios are informational. The CLI was including
all scenarios in pass_rate, causing extension-only failures to block
Tier 1.
Changes:
- pass_rate now only counts scenarios with at least one date-versioned
spec version
- Terminal and markdown output split into a tier-scoring matrix
(date-versioned + All*) and an informational section (draft/extension)
that only renders when there are draft/extension scenarios
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