feat(render): derive the #+TODO line and keywords from team workflow states

The renderer wrote a fixed #+TODO line and mapped state names through a static defcustom, so a workspace's real states (Dev Review, PM Acceptance, ...) never showed up. Now the displayed issues' teams drive both.

pearl--gather-header-states collects each team's full state set (cached via pearl--team-states, teams in first-seen order, states by position) plus every displayed issue's own state, so a failed team fetch still leaves its issues' states declared. pearl--build-org-content takes that list and derives the #+TODO via pearl--derive-todo-line. pearl--format-issue-as-org-entry renders each keyword with pearl--state-name-to-keyword instead of the static map -- slugify reproduces the old defaults, so standard states are unchanged -- and writes a :LINEAR-STATE-TYPE: drawer so a later merge scan can classify a retained heading. The team-states query gains type and position.

The integration test stubs pearl--team-states so the render stays network-free. The merge-refresh header rebuild is the next commit. Until then a same-source refresh keeps the previous header.

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