feat: add custom-agent reasoning effort

[krukow]

_{Generated via Copilot on behalf of @krukow}

Adds per-custom-agent reasoning effort in parity with upstream PR #1981 and syncs the Clojure SDK version to 1.0.7.0.

Design

• Uses :agent-reasoning-effort, consistent with the existing :agent-model naming convention, while emitting the exact upstream reasoningEffort wire field.
• Shares custom-agent serialization across session create and resume so both paths remain wire-compatible.
• Omits the field when unset; the backend chooses its default rather than inheriting the parent session effort.

Validation

• Integration suite: 344 tests, 1,673 assertions, zero failures or errors
• Full E2E suite: 415 tests and 2,299 assertions; one live list-sessions timeout passed on isolated retry
• All examples passed
• Documentation validation passed
• 1.0.7.0 JAR built successfully

Review

Reviewer	Finding	Decision
Claude Opus 4.8	No code defects; release-hygiene follow-up	Feature documented under [Unreleased]; release-section finalization remains with the maintainer
GPT-5.5	No findings	No action

[Copilot]

Pull request overview

Adds per-custom-agent reasoning effort support to the Clojure Copilot SDK (matching upstream PR #1981), ensuring the new option is spec’d, serialized correctly onto the wire for both session creation and resume, and documented—while also syncing the project version to 1.0.7.0.

Changes:

• Added :agent-reasoning-effort to custom-agent specs and API surface, with allowed values "low"|"medium"|"high"|"xhigh".
• Centralized custom-agent wire serialization for session.create and session.resume, emitting reasoningEffort only when set.
• Updated docs/changelog and bumped the library version to 1.0.7.0, plus added integration coverage for wire shape + omission behavior.

Show a summary per file

File	Description
test/github/copilot_sdk/integration_test.clj	Adds integration tests for custom-agent reasoning effort spec validity, wire emission on create/resume, and omission when unset.
src/github/copilot_sdk/specs.clj	Introduces ::agent-reasoning-effort and ::reasoning-effort spec; wires the new key into ::custom-agent.
src/github/copilot_sdk/client.clj	Adds custom-agent->wire and uses it in both create and resume param builders to emit reasoningEffort.
resources/github/copilot_sdk/api_surface.edn	Extends the API surface allowlist to include agent-reasoning-effort.
README.md	Updates Maven dependency version example to 1.0.7.0.
doc/reference/API.md	Documents :agent-reasoning-effort and its wire behavior in the public API reference.
doc/getting-started.md	Updates dependency snippet to 1.0.7.0.
doc/api/getting-started.html	Updates rendered HTML docs to 1.0.7.0.
doc/api/API.html	Updates rendered HTML API docs with :agent-reasoning-effort and an example.
CHANGELOG.md	Adds an [Unreleased] entry for per-custom-agent reasoning effort (post-v1.0.7 sync).
build.clj	Bumps project version to 1.0.7.0.

Review details

• Files reviewed: 11/11 changed files
• Comments generated: 1
• Review effort level: Low

[Copilot]

Review details

• Files reviewed: 11/11 changed files
• Comments generated: 0 new
• Review effort level: Low