docs(development): move the streaming construction plan out of the repo into issue #1478

[DecisionNerd]

Why

The streaming construction plan — the plan of record for #1387 (the ingest throughput floor) and #1456 (the construction foundation) — went through eleven revisions in two days. As a repository file every revision needed a pull request. The maintainer's instruction: "we should move it out of the repo and move it into the issues or milestone body so we are not dealing with PRs."

What

• Deletes docs/development/streaming-construction-plan.md (rev 11, landed by docs(development): streaming construction plan rev 11 — the #1387 floor, per resource (#1387, #1456) #1475).
• Removes its row from the index table in docs/engineering/README.md.

Nothing else references the file (checked across *.md, *.yml, *.toml, *.py).

Where the plan lives now

#1478 — plan: streaming construction plan (rev 12) — the #1387 floor, per resource, in milestone M5. It is the plan of record and the closing issue for the ingest-throughput workstream (#1387 sits under it as a sub-issue; #1456 sits under #1387). It is not M5's closing tracker; that remains #735.

Rev 12 is not a copy of rev 11. Its section 0 records every claim rev 11 made that the F1 device measurement, the perf stat / N-way scaling measurement and the external review refuted, and what replaced each. Rev 11's text stays in history at 7b0113dd.

The status headers on #1387 and #1456, the M5 description, and the local pointer files are repointed to #1478 alongside this PR.

Gates

• scripts/ci/adr-index.py check — ok, 35 active and 3 superseded records agree
• scripts/source_size_policy.py — 693 files checked, 0 violations
• scripts/ci/test-text-checkout-policy.py — 3,603 tracked paths resolve to LF
• make pre-push-fast — passed

🤖 Generated with Claude Code

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