fix(web): add explicit ARIA role='region' to ActivityPane section (#3672)

[djm204]

Fixes #3672.

Description

The ActivityPane component rendered its activity stream in a <section> with aria-label="Activity" but lacked an explicit ARIA landmark role="region", hindering keyboard and assistive technology navigation.

Changes

• Added role="region" attribute to <section> in packages/franken-web/src/components/activity-pane.tsx.
• Created unit tests in packages/franken-web/tests/components/activity-pane.test.tsx verifying landmark accessibility attributes and rendering.

[djm204]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 11d8e9892e

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[djm204]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: c9fc703146

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

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[djm204]

Closing without merge because the immutable exact head c9fc703146aac0bcaf75158dd717dbfc6f79e589 is not eligible under the no-bypass closeout gate.

Closeout evidence:

• Repaired the stale/conflicting branch by merging current main non-destructively. The final PR diff is limited to the intended ActivityPane accessibility change and one focused colocated test: 2 files, 8 insertions, 1 deletion.
• Local verification passed: npm ci; root npm run build (10/10 packages); npm --prefix packages/franken-web run typecheck; and the complete affected src/components/activity-pane.test.tsx file (9/9 tests).
• The second and terminal Codex review round reported clean for this head at 2026-08-09T14:11:27Z. Fully paginated GraphQL audit found 0 unresolved Codex-authored threads. All prior findings were linked/resolved: Bound ConcisenessEvaluator comment-ratio scans for large inputs #3657/perf(critique): bound ConcisenessEvaluator input memory and processing (#3657) #3684, TokenBudgetBreaker should reject non-finite costBudgetUsd values #3843/chore: release main #3885/fix(critique): reject non-finite costBudgetUsd in TokenBudgetBreaker #3886, the one-shot progress file was removed, and the remaining P3 documentation cleanup was filed as docs: refresh stale deploy-beasts sprint plan #4128.
• Exact-head CI run https://github.com/djm204/frankenbeast/actions/runs/31317632729 is red: build-test-lint (1337) failed in the dependency-vulnerability SLA dashboard on five current-main high-severity baseline findings (brace-expansion, fast-uri, ip-address, nanoid, undici). The PR’s ActivityPane-only diff does not remediate that repository-wide dependency baseline.
• The other exact-head jobs passed: publish smoke, Codex CLI compatibility 0.143.0, and Codex CLI compatibility latest.
• GitHub reports MERGEABLE but UNSTABLE. No admin/bypass merge is authorized or used.

Issue #3672 remains open for a future merge-eligible implementation. This PR is closed at the immutable reviewed head rather than merged through red CI.