docs(ingest): the chain from ingest to run does not close by itself

Walked Door A from a fresh clone: materializing the file-family golden
manifest writes index.md plus one concept file per extraction, and pointing
the run at the result is refused —

    run refused: IR projection not found in bundle: 'validator-input.json'

A clean fail-fast, but nothing adopter-facing said it was coming, while the
README actively invites it ("swap --bundle-dir for your own bundle"). The
run path needs the bundle's IR projection, which ingest does not and cannot
produce: ingest materializes source documents, the projection states the
candidate measure. Both docs now say so, with the shape reference named.

Also corrects a live-doc claim that was wrong in both halves: the MCP
timeout is `anyio.fail_after` nested inside both task groups, not
`asyncio.wait_for`, and `tests/test_ingest_golden_mcp.py` covers it
(verified — 2 passing timeout tests). And no bundled example ships a
`cost-baseline.json`, so the text no longer implies one does.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GyAbxJoyypnLLUDcMvnKh8

README.md

@@ -79,6 +79,10 @@ uv run python -m portfolio_optimiser.run BYGG-KONTOR-NORD \
 
 Ends in `ValidatedProposal`. Swap `--bundle-dir`/`--docs-dir` for your own bundle to run it over
 your own data — that is the point of this door, and the reason it is not the same thing as step 2.
+Your bundle needs one file the ingest layer does not write for you: `validator-input.json`, the
+candidate the deterministic validator judges (a bundle without it is refused, by design — see
+[`docs/extending.md`](docs/extending.md)). Copy the shape from
+`shared/examples/bygg-energi-mikro/`.
 
 **4 — Watch it say no.** Raise `claimed_saving_nok` to `250000` in `replies.json` and run the same
 command again. The outcome becomes `Rejection`: the deterministic validator refuses a saving the