Refinements A-D to the external-job capability (PR #1998 follow-up):
A. Document why the contribution registers at execute:wave:post: #1164 asks
for wave:pre, but execute-phase.md only dispatches wave:post today (wave:pre
is declared in the loop host contract but not rendered). Wiring wave:pre is
a core-loop change #1164 puts out of scope; the executor honors the
runtime_budget classification guidance before running any tagged task.
B. external_job.artifact_dir is now consumed (was declared but unused): the
adapter resolves it via the canonical capability-config seam and surfaces
the resolved root in submit output.
C. external_job.submit_timeout_ms / poll_timeout_ms are now read from config
(were shadowed by env-only reads). Precedence: env > config > registry
default; non-numeric config values fall back (no guessing, no NaN).
D. CLI surface gains unit coverage: parseFlags, findPlanningDir,
resolveExternalJobSettings, formatShowReport.
Regenerates capability-registry.cjs from the updated capability.json.
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