docs: archive the improvement log/scan and the June superpowers plans

Moved to docs/archive/ (kept for their history, not deleted), each with a one-line header saying it is historical and what supersedes it: - IMPROVEMENT_LOG.md: three automated-loop PRs from April-May 2026, on the earlier quantumclaw PR numbering, which now collides with this repo's #12-#15. Superseded by CHANGELOG.md and git log. - IMPROVEMENT_SCAN.md: one scan's notes (2026-05-04) of changes merged long ago. Superseded by CHANGELOG.md and git log. - docs/superpowers/plans/*.md -> docs/archive/plans/: agent pre-work plans for d6c4d4f (2026-06-30), already marked implemented. The MPI plan promised collective MPI-IO, which is not what shipped (MpiVol is root-read + broadcast); its header says so and points at ROADMAP.md, where collective I/O is an open item. Nothing links to the old paths (research/*.md mention IMPROVEMENT_LOG.md and ROADMAP.md in prose only). Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
2026-09-28 11:13:40 -05:00
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+> **Historical (archived 2026-09-28):** a log of an automated improvement loop's PRs from April–May 2026, on the earlier `quantumclaw/clawhdf5` PR numbering (not today's). Superseded by [`CHANGELOG.md`](../../CHANGELOG.md) and `git log`.
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 # Improvement Log -- clawhdf5

 | Date | Loop | PR | Changes | Status |
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+> **Historical (archived 2026-09-28):** one automated scan's notes (2026-05-04), describing changes long since merged. Superseded by [`CHANGELOG.md`](../../CHANGELOG.md) and `git log`.
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 # Improvement Scan -- clawhdf5

 **Date:** 2026-05-04
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+> **Historical (archived 2026-09-28):** a pre-work plan, implemented in `d6c4d4f` (2026-06-30). Superseded by the code (`crates/clawhdf5-format`), [`CHANGELOG.md`](../../../CHANGELOG.md) and [`ROADMAP.md`](../../../ROADMAP.md); not an open task list.
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 # Filter Codecs Implementation Plan

 > **Status (2026-08-03):** Implemented — shipped in commit `d6c4d4f` (2026-06-30), with FFI/constant fixes in `cb0b0e9`/`e91f7fc`. This doc was authored 2026-06-29 as the pre-work plan and committed to the repo retroactively on 2026-08-03; checkboxes below have been marked complete to match. Treat this as a historical record, not an open task list.
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+> **Historical (archived 2026-09-28):** a pre-work plan, implemented in `d6c4d4f` (2026-06-30) and on 2026-08-03. Superseded by the code (`crates/clawhdf5-format`), [`CHANGELOG.md`](../../../CHANGELOG.md) and [`ROADMAP.md`](../../../ROADMAP.md); not an open task list.
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 # Format Write Extensions Implementation Plan

 > **Status (2026-08-03):** Implemented. Tasks 1–3 (external links, VDS mapping serialization, VDS `FileWriter` API) shipped in commit `d6c4d4f` (2026-06-30). Tasks 4–5 (superblock v4 read/write) were not part of that commit and were completed separately as part of this cleanup pass (2026-08-03) — see `Superblock::parse_v4`/`serialize` and `FileWriter::with_page_size` in `crates/clawhdf5-format`. This doc was authored 2026-06-29 as the pre-work plan and committed to the repo retroactively; checkboxes below have been marked complete to match current state. Treat this as a historical record, not an open task list.
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+> **Historical (archived 2026-09-28):** a pre-work plan. Its goal of *collective* MPI-IO is not what shipped: `MpiVol` (`d6c4d4f`) is root-read + broadcast and gather-to-root writes (see [`crates/clawhdf5-io/README.md`](../../../crates/clawhdf5-io/README.md)); collective I/O is an open item in [`ROADMAP.md`](../../../ROADMAP.md).
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 # MPI-IO VOL Backend Implementation Plan

 > **Status (2026-08-03):** Implemented — shipped in commit `d6c4d4f` (2026-06-30), with FFI/constant fixes in `cb0b0e9`/`e91f7fc`. This doc was authored 2026-06-29 as the pre-work plan and committed to the repo retroactively on 2026-08-03; checkboxes below have been marked complete to match. Treat this as a historical record, not an open task list.