feat(#2): consume GET /me + GET /capabilities via --whoami one-shot
v1 coverage-audit slice (capabilities+me). Both endpoints had no caller; add them as cheap boot-time debug primitives. - sessions.py: get_me (GET /me — identity/whoami) + get_capabilities (GET /capabilities — Echo ephemeral-template discovery). Mirror get_persona_state: 200 -> parsed dict verbatim, non-200 -> SessionApiFailed. Freeform dicts (frozen OpenAPI types both as objects). - cli.py: new --whoami one-shot mode (mirrors --send). Fetches both, prints an identity + capabilities report, exits. Standalone probe: mutually exclusive with --send/--session/--new/--agent; opens no session. New ParsedArgs.whoami field + main() dispatch. - Contract #2 amended (2 FNs) + validated. TDD: 5 wrapper tests + 5 cli tests (validation + mode + error). Coverage map: REST 9/40. Suite 538 green; touched code ruff-clean. Audit note: /capabilities is the Echo ephemeral-template discovery endpoint, not a generic server-caps endpoint (coverage-map framing corrected). TUI-surfacing of /me + /capabilities deferred.
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