Add acquire_token() public method for cross-resource auth

[athanipavan]

Summary

• Adds _AuthManager.acquire_token(resource_url) -- a thin public helper over the existing _acquire_token: appends /.default and delegates to the underlying TokenCredential. Lets callers reuse the same credential to obtain tokens for any Microsoft AAD-protected resource (notably a linked Finance & Operations env) via client.auth.acquire_token(fno_url).
• Refactors internal _ODataClient._headers() to call the new method, so the DV and external paths share one scope-construction site (no duplication).
• README, both SKILL.md copies, and CHANGELOG updated. Inline DummyAuth mocks in conftest.py and three test modules updated to also expose acquire_token so existing _odata._headers tests still pass with the refactored call site.

End-to-end verification

Probe against a real F&O int env using the modified SDK + AzureCliCredential:

Step	Result
client.auth.acquire_token("https://aurorabapenvf94ec.operations.int.dynamics.com")	Token issued, length 2948
Token aud claim (decoded JWT)	https://aurorabapenvf94ec.operations.int.dynamics.com (F&O resource, not DV)
GET <fno_url>/data/$metadata with that token	HTTP 200, ~53 MB of F&O EDMX (Microsoft.Dynamics.DataEntities namespace)

F&O accepted the token. The same code path is taken for DV's own header construction, so the DV experience is unchanged.

Test plan

• pytest tests/unit -q -- 1393 passed (4 new acquire_token tests + existing suite)
• _auth.py line coverage: 100%
• Manual end-to-end probe against live F&O env (HTTP 200 + correct token audience)
• DV-only flows unchanged (no extra AAD roundtrips; _headers() still uses base_url from constructor)

Notes for reviewers

• client.py is untouched; the new method lives on _AuthManager (single source of truth for scope construction).
• F&O usage is fully opt-in: the SDK never calls acquire_token with an F&O URL on its own. Customers explicitly pass the F&O URL when they need it.
• Both SKILL.md copies verified byte-identical per the dataverse-sdk-dev contract.

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[Copilot]

Pull request overview

Adds a public client.auth.acquire_token(resource_url) helper so callers can reuse the Dataverse client credential for other Microsoft AAD-protected resources, and routes Dataverse OData header token acquisition through the same scope-construction path.

Changes:

• Added _AuthManager.acquire_token() with scope construction and unit tests.
• Refactored _ODataClient._headers() to call the new auth helper.
• Updated README, changelog, skill docs, and test auth stubs for the expanded auth surface.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/PowerPlatform/Dataverse/core/_auth.py	Adds the public token acquisition helper and related documentation.
src/PowerPlatform/Dataverse/data/_odata.py	Refactors header construction to use auth.acquire_token(self.base_url).
tests/unit/core/test_auth.py	Adds tests for public token acquisition behavior.
tests/conftest.py	Updates shared dummy auth fixture with acquire_token.
tests/unit/core/test_http_errors.py	Updates local dummy auth for _headers() refactor.
tests/unit/data/test_logical_crud.py	Updates local dummy auth for _headers() refactor.
tests/unit/data/test_enum_optionset_payload.py	Updates local dummy auth for _headers() refactor.
README.md	Documents acquiring tokens for linked/non-Dataverse Microsoft resources.
.claude/skills/dataverse-sdk-use/SKILL.md	Adds skill guidance for cross-resource token acquisition.
src/PowerPlatform/Dataverse/claude_skill/dataverse-sdk-use/SKILL.md	Mirrors the skill guidance update in packaged skill docs.
CHANGELOG.md	Records the new auth helper under Unreleased.

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