Select current-year writing; point demo and README at the write path

[telivity-otaip]

select capped the corpus at a hardcoded DEFAULT_THROUGH_YEAR = 2024, so any corpus written in 2025 or later selected zero pieces. build-style-profile reads that selection, which means the style card driving every write draft was measured from a pre-2025 slice — or from nothing. run_build_writer_sft already bypassed the year gate for exactly this reason; select had not caught up. The cap now defaults to the current year, and --through-year stays for deliberate narrowing. Holdouts remain separate and explicit (--holdout-id).

Also:

• run_demo now runs select → index-voice → build-style-profile → write, stubbing only the model call through the existing generate_fn seam. No weights download. Retrieval, style card, trim and guards are the real code. The mock train/filter tail stays because test_api_health depends on it.
• Demo output names the write path and marks the stub: adapter=none model=stub.
• select now points at index-voice; train points at eval-write-holdout with the keep-only-if-it-beats-RAG rule.
• README: select added to the quick start — build-style-profile requires it, so the documented path previously dead-ended.
• Regenerated cli-status.png and cli-demo.png from real output, added cli-setup.png and scripts/shot.py so docs images stay reproducible.

ruff clean, 272 tests pass (3 new), sanitize OK.