docs(design): add Phase 1 utility inventory

Phase 1 of utility-consolidation per docs/design/utility-consolidation.org. The inventory walks the spec's 30-entry Candidate Extraction Table and, for each helper, records: visibility, dependencies, side effects, callers in modules and tests, test file location, extraction priority, and a Migrate / Leave / Defer decision with rationale.

Decisions: 11 Migrate, 3 Leave, 13 Defer. The Migrate items are grouped by phase in the spec's recommended order: Phase 2 (foundation helpers -- executable lookup, shell quoting, process runner, file-from-context), Phase 3 (Org-safe text sanitizers), Phase 4 (external-open consolidation). The Defer items mostly need a second production caller before promotion is justified.

Discoveries worth recording: `cj/log-silently' already has 10 production callers (more than the spec's table suggested), and `cj/--file-manager-program-for' shipped today in dirvish-config.el is the new form of OS-dispatch consolidation -- Phase 4's `cj/external-open-command' should fold it in rather than re-deriving.

No code behavior changes -- this is the spec's stated Phase 1 exit criterion.

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