mr0: finish config consolidation; document bespoke log/dry-run consumers

Consumers 5 (log_configured_action) and 6 (the --dry-run plan) are
consciously left bespoke: both are human-facing prose that interleaves a
curated subset of config fields (each with its own label and per-field
decoration) with non-config values (resolved rc_file path,
SHURIKEN_FORCE_GENERATE, computed image/page/redirect counts, planned
tarball name, and whole non-config 'Planned directories/files' sections).
Driving them from CONFIG_SPECS would require per-line label+format+marker
facets that contort the schema for no DRY benefit, since each string
appears exactly once.

They already read the canonical registry-driven globals, so CONFIG_SPECS
remains the single source of truth for the config schema; only the
presentation stays hand-written. Added comments to both explaining the
decision. No behavior change -- output stays byte-identical (asserted by
the effective-config log and dry-run plan tests).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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