docs: release notes for 26.08

[ramakrishnap-nv]

Summary

Draft release notes for 26.08 based on ~456 commits since v26.06.00a. This is a team review PR — please add, remove, or update entries before we merge.

Sections covered:

• New Features — multi-GPU PDLP, fast MPS parser, recursive RINS, zero-half cuts, MIP scaling, Papilo crush, UBI10 FIPS container, routing CPU import + NumPy/pandas inputs, gRPC async client, C API getters
• Breaking Changes — none identified; please flag anything missed
• Improvements — concurrent mode latency, crossover dual simplex, CTK 13.3 wheels, cuda-python dep removal, gRPC GPU assignment
• Bug Fixes — routing layout, libomp ABI, barrier cuDSS, MIP cuts timer, GF2 presolve, gRPC shutdown/cancel/log drain
• Documentation — branding and Doxygen alignment

Review checklist

• Verify each entry is worded correctly for the audience (users, not developers)
• Remove any entries that are internal/infra only and not user-visible
• Add any entries for commits that were missed
• Confirm or update the "Breaking Changes" section
• Add new contributors section if applicable

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📥 Commits

Reviewing files that changed from the base of the PR and between 9aba79d and 2071bcf.

📒 Files selected for processing (1)

• RELEASE-NOTES.md

🚧 Files skipped from review as they are similar to previous changes (1)

• RELEASE-NOTES.md

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📝 Walkthrough

Walkthrough

Added Release Notes 26.08 entries for features, a routing breaking change, improvements, bug fixes, documentation updates, and contributor credits.

Changes

Release Notes 26.08

Layer / File(s)	Summary
Features and routing contract RELEASE-NOTES.md	Lists new 26.08 capabilities and documents deferred GPU device construction in DataModel as a routing breaking change.
Improvements and bug fixes RELEASE-NOTES.md	Lists solver, API, container, threading, logging, routing, and gRPC improvements and fixes.
Documentation and contributor credits RELEASE-NOTES.md	Adds documentation updates and credits new contributors.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: iroy30

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the release notes scope, covered areas, and requested team review.
Title check	✅ Passed	The title clearly identifies the documentation change and the 26.08 release notes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-notes/26.08

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CI Test Summary

⏭️ All 5 test job(s) skipped.

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@RELEASE-NOTES.md`:
- Line 66: Update the gRPC log-streaming release-note entry to read “gRPC: Fix a
race condition in log streaming.”
- Line 47: Correct the spelling errors in the release notes: update the MIP
entry to say “single-threaded mode” instead of “singlethread,” and change
“formt” to “format” in the entry identified at line 56.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
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---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 75a4544e-f361-4771-88fe-6fb52a71a7ea

📥 Commits

Reviewing files that changed from the base of the PR and between 33a2324 and 9aba79d.

📒 Files selected for processing (1)

• RELEASE-NOTES.md

[coderabbitai]

📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Correct the release-note spelling errors.

• Line 47: use single-threaded mode instead of singlethread.
• Line 56: use format instead of formt.

Also applies to: 56-56

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@RELEASE-NOTES.md` at line 47, Correct the spelling errors in the release
notes: update the MIP entry to say “single-threaded mode” instead of
“singlethread,” and change “formt” to “format” in the entry identified at line
56.

[coderabbitai]

📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Clarify the gRPC log-streaming entry.

Replace gRPC: fix race condition in gRPC with log streaming with gRPC: Fix a race condition in log streaming.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@RELEASE-NOTES.md` at line 66, Update the gRPC log-streaming release-note
entry to read “gRPC: Fix a race condition in log streaming.”