Fix publisher runs for unsynced targets

[Kingson4Wu]

Summary

• Treat publisher definitions with targets missing from persisted state as due.
• Add regression coverage for adding a new Apple Notes publisher target after existing targets recently synced.
• Keep legacy naive timestamp coverage isolated by giving it complete default-target state.

Confirmed Bug

When a publisher definition gained a new target, _is_due() only considered existing target timestamps in persisted state. If the known targets synced recently, run_due() skipped the publisher and the new target did not publish until TTL expiry.

Verification

• uv run pytest --no-cov tests/test_publishers.py::test_publisher_due_check_runs_when_definition_has_unsynced_targets
• uv run pytest --no-cov tests/test_publishers.py
• scripts/check-docs-drift.sh src/alcove/publishers.py tests/test_publishers.py
• scripts/agent-quality-gate.sh --mode coach
• scripts/check.sh

Notes

• No docs update needed: this restores expected publisher scheduling behavior rather than changing the user-facing contract.
• No dependency changes.
• Push reported an existing Dependabot finding on the default branch; this bug-fix PR does not touch dependencies.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-code-quality]

Code Coverage Overview

Languages: Python

Python / code-coverage/pytest

The overall coverage in commit f6c7655 in the loop/alcove/bug-fix/... branch is 89%. The coverage in commit 8cd58ef in the dev branch is 87%.

Show a code coverage summary of the most impacted files.

File	dev 8cd58ef	loop/alcove/bug-fix/... f6c7655	+/-
alcove/service_launchd.py	0%	78%	+78%
alcove/dashboard_server.py	12%	97%	+85%
alcove/radars/proposals.py	0%	91%	+91%
alcove/service_task_health.py	0%	91%	+91%
alcove/service_...ount_refresh.py	0%	91%	+91%
alcove/mcp_managed_kb_tools.py	0%	96%	+96%
alcove/service_...otifications.py	0%	96%	+96%
alcove/profile_...ll_templates.py	0%	97%	+97%
alcove/radars/explain.py	0%	98%	+98%
alcove/entry_contracts.py	0%	98%	+98%