chore(quantecon): track PR #81 in fork trackers and cut qe-v9 metadata

[mmcky]

Post-merge maintenance round for #81 (per-row equation numbering, squash 756a4d5d).

VERSION.yml — appends merged_features entry 14 (per-row-equation-numbering, local_pr: 81, merge_sha: 756a4d5d, tag: null).

UPSTREAM-PRS.yml — adds the per-row-equation-numbering upstream candidate (status: pending, single squash commit). The notes capture the upstream pitch (no upstream issue tracks this; PDF export already numbers per-row while HTML numbers per-block, so mystmd currently disagrees with itself across outputs), that the katex ^0.16.21 bump rides in the same squash and is independently useful upstream, and a cherry-pick caveat: the enumerate.ts changes sit textually inside fork-modified book-mode code, so replaying onto upstream/main will need a small rework or bundling after book-mode-with-section-scope.

Tag status after this lands: entries 12–14 (ci-deflake, ipynb-attachment-fixes, per-row-equation-numbering) are tag: null — a qe-v9 checkpoint covering all three is available whenever book-dp1/book-dp2 should pick up per-row numbering via a pinned tag.

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[Copilot]

Pull request overview

Updates QuantEcon fork tracking metadata to record the post-merge status of PR #81 (“per-row equation numbering”) and stage it as an upstream candidate.

Changes:

• Append merged feature entry id: 14 for per-row-equation-numbering in quantecon/VERSION.yml (including local_pr, merge_sha, and tag: null).
• Add a new upstream_candidates entry per-row-equation-numbering in quantecon/UPSTREAM-PRS.yml with status, commit pointer, and upstream/cherry-pick notes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
quantecon/VERSION.yml	Records PR #81 as merged feature entry 14 with metadata for downstream tag checkpointing.
quantecon/UPSTREAM-PRS.yml	Adds the PR #81 feature as a pending upstream candidate with rationale and replay caveats.

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[mmcky]

Updated: this PR now also cuts the qe-v9 metadata — qe_version: qe-v9 and tag: qe-v9 on entries 12–14 (ci-deflake, ipynb-attachment-fixes, per-row-equation-numbering). Per the release protocol, the qe-v9 git tag will be cut on the squash commit this PR produces, so the tagged tree is self-consistent.