chore: prepare 0.0.12 release

[bplevin36]

Summary

• bump Rust workspace, Python wrapper, and NPM wrapper versions to 0.0.12
• move user-facing release notes from Unreleased into CHANGELOG.md

Test plan

• cargo test --workspace
• cargo clippy --workspace --all-targets -- -D warnings
• npm test (adk-napi)
• uv run python -m unittest discover -s tests (adk-python)
• dist plan

[github-actions]

✅ No CRAP regressions

↑ 0 regressed · ★ 0 new · ↔ 0 moved · ↓ 0 improved · 1736 unchanged · — 0 removed

🔥 Top hot spots above threshold

	CRAP	CC	Cov %	Function	Location
✗	229.1	17	9.8	cmd_uninstall	adk-cli/src/commands/uninstall.rs:13
✗	117.7	20	37.5	json_to_py	adk-python/src/lib.rs:1762
✗	95.4	35	63.3	cmd_chat_with_service	adk-cli/src/commands/chat.rs:21
✗	90.0	9	0.0	cmd_start	adk-cli/src/commands/start.rs:11
✗	90.0	9	0.0	Project::push	adk-python/src/lib.rs:114
✗	90.0	9	0.0	DeploymentManager::promote	adk-python/src/lib.rs:378
✗	72.0	8	0.0	authenticate_and_save_key	adk-cli/src/commands/login.rs:98
✗	72.0	8	0.0	jupiter_base_url	adk-api-client/src/auth.rs:298
✗	72.0	8	0.0	api_key_env_names	adk-python/src/lib.rs:1437
✗	58.3	17	47.7	py_to_json	adk-python/src/lib.rs:1714
✗	56.0	7	0.0	cmd_login	adk-cli/src/commands/login.rs:11
✗	56.0	7	—	collect_python_template_files	adk-core/build.rs:41
✗	56.0	7	0.0	BranchManager::switch	adk-python/src/lib.rs:235
✗	51.2	21	59.1	AdkService::push_main_to_new_branch	adk-service/src/lib.rs:761
✗	48.7	28	70.2	cmd_push	adk-cli/src/commands/push.rs:18
✗	47.3	46	91.4	update_flow_commands	adk-resources/src/flows/command_gen.rs:317
✗	46.3	28	71.4	cmd_branch_delete	adk-cli/src/commands/branch.rs:417
✗	46.2	25	67.6	cmd_branch_switch_with_service	adk-cli/src/commands/branch.rs:327
✗	44.5	18	56.6	cmd_branch_merge	adk-cli/src/commands/branch.rs:577
✗	44.4	43	90.8	run	adk-cli/src/main.rs:39
✗	43.2	10	30.8	AdkService::pull_resources_with_branch_reconciliation	adk-service/src/lib.rs:940
✗	43.1	17	55.1	cmd_deployments_rollback	adk-cli/src/commands/deployments.rs:482
✗	42.0	6	0.0	edit_in_editor	adk-cli/src/commands/branch.rs:1126
✗	42.0	6	0.0	DeploymentManager::show	adk-python/src/lib.rs:335
✗	42.0	6	0.0	api_key_for_region	adk-python/src/lib.rs:1400

…and 8 more, see CI artifact for the full report.

Full reports: coverage-and-crap-reports artifact (workflow run).