mozilla / relman-auto-nag / #5967

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Send newly filed frontend bugs from Mozilla staff for automatic triage

hackbot's frontend-triage agent produces a root-cause analysis and fix plan
for a Firefox frontend bug, and posts it to the bug when it is confident — but
nothing was starting runs, so every triage needed a human to trigger it from
the hackbot UI. This rule starts them for newly filed bugs, hourly.

Scoped deliberately narrowly, because the agent's analysis lands on the bug
unattended:

- Reporters we expect to file well. Staff membership comes from the IAM roster
  we already maintain (`People.is_mozilla`), which covers QA as well now that
  they file from @mozilla.com addresses. The roster is also the reason this
  lives here rather than in bugbug: it maps a staffer's Bugzilla address to
  them, so employees who file from a personal account are still in scope, and a
  @mozilla.com address IAM doesn't know about is not.
- One component to start, `Firefox :: New Tab Page`. The component list is
  config, so widening it is an edit to configs/rules.json.

The rule makes no Bugzilla writes of its own — it starts runs and reports what
it started. `max_triggers` caps how many runs one invocation may start, since
each is real LLM spend, and bugs left over (over the cap, or whose run failed
to start) are excluded from the report and the cache so they come back on the
next run rather than being silently dropped.

`HACKBOT_API_URL` defaults to the production deployment so the cron host needs
no extra environment, the way `BUGBUG_HTTP_SERVER` does; set it to point at
another deployment. `People` is injectable because configs/people.json is
gitignored and absent in CI, so the reporter filter could not otherwise be
tested at all.

Requires `hackbot_api_key` in configs/config.json; the rule fails up front and
reports it if the API URL is explicitly blanked.

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