chore(release): cut 0.1.26

[Jason Robert (jrob5756)]

Release: v0.1.26

Previous release: v0.1.25

Commit audit (2 commits since v0.1.25)

Commit	Classification
#317 fix(providers): align Copilot and Hermes prompt schemas on the shared recursive builder	Fixed
#338 feat(aca): resolve Copilot credential automatically via gh auth token (29-commit ACA provider epic merge, closes#284)	Added

Changelog summary

• Added: new experimental aca (Azure Container Apps) provider — consolidated into a single entry describing the feature (delegates the agentic loop to a remote sandbox, includes provisioning tooling, runner image, example workflow, and automatic gh auth token credential fallback). The 3 incidental bug-fix bullets previously listed separately (image tag casing, error body truncation, example model pin) were folded in / dropped since they were bugs in code that had never shipped, not user-facing regressions.
• Fixed: added a missing entry for fix(providers): align Copilot and Hermes prompt schemas on the shared recursive builder #317 — Copilot/Hermes prompt schemas no longer synthesize a fallback field description, and Hermes now shares Copilot's recursive schema builder (fixes array<object>/array<array> nesting).

Validation

• make check ✅ (1 pre-existing ty warning in dialog_evaluator.py, unrelated to this range, unchanged from origin/main)
• make test ✅ 4439 passed, 26 skipped, 8 deselected
• make validate-examples ✅ (ACA example changed in this range)

Next steps

Merging this PR will be followed by tagging the merge commit v0.1.26 and pushing it, which triggers .github/workflows/release.yml to build, test, and publish the GitHub Release.