docs(spec+plan): rename CLI binary from da to agnes (BREAKING)
- Spec rev 5: branding consistency. New CLI verbs use agnes prefix
(agnes init, agnes pull, agnes push, agnes catalog, agnes status,
agnes snapshot create, agnes admin, …).
- Plan: add Phase 0 / Task 0 — pyproject.toml [project.scripts] entry
rename to "agnes = cli.main:app" + Typer(name="agnes") in cli/main.py.
- Legacy command references (da sync, da fetch, da analyst setup,
da metrics) keep their da prefix throughout — they're historical
artifacts being removed (preserved in CHANGELOG Removed section,
_LEGACY_STRINGS constant for admin override scan, etc.).
Bulk rename via Python regex with verb whitelist: 286 verb refs
rewritten in plan, 265 in spec; 104+72 legacy refs restored to "da"
post-pass (false positives where the doc was describing the legacy
flow being replaced).
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