Add sdp-expectation-notifications asset (v1.11.0)

[vmariiechko]

Related Issue

None (asset ships directly per the asset-library authoring workflow).

Summary

Adds the sdp-expectation-notifications asset: per-expectation data-quality notification for Lakeflow SDP, packaged as the pair the pattern requires. A native event hook (@dp.on_event_hook) notifies the moment a WARN expectation result is logged (fast path, best-effort by platform design: no guarantee every hook runs before pipeline compute terminates), and exactly one DABs-managed Alert v2 sweeps the published pipeline event log over a trailing 1-day window on a schedule (guaranteed path). This PR also cuts release v1.11.0.

Changes

• New dual-door asset assets/sdp-expectation-notifications/: reference pipeline on samples.nyctaxi.trips (one streaming table, a deliberate WARN tripwire trip_distance < 5, the notifier hook with print + optional requests webhook), pipeline resource with event_log publication, backstop Alert v2 resource (GREATER_THAN 0 over summed failed_records, daily 06:00 UTC cron, email subscription), event-log queries, in-bundle usage doc, and a companion agent skill (SKILL.md + 2 references) that wires the pattern into the user's own pipeline.
• 8 prompts with safe defaults; warehouse_id and notification_email default to placeholders; the alert resource filename/key derive from pipeline_resource_key (<key>_backstop).
• Asset-specific tests (tests/assets/test_sdp_expectation_notifications.py, 18 tests) including an AST-based guard that the shipped pipeline source makes no .sql() call (the live-proven hook anti-pattern) and that the alert query aggregates a past-time window rather than latest-row.
• Catalog/roadmap/changelog rows; release metadata finalized ([1.11.0] - 2026-07-11, both version markers bumped).

Change Area

• Asset Library (assets/<name>/)

Configuration Axes Affected

• Asset Library (new asset, asset schema, or framework changes)

Testing

• All tests pass (pytest tests/ -V): 2440 passed, 163 skipped
• Manual template generation tested (asset install via databricks bundle init ./assets/sdp-expectation-notifications --output-dir <tmp> --config-file tests/configs/assets/sdp_expectation_notifications.json)
• New tests added for new functionality

Asset Changes

• Asset installs standalone via databricks bundle init . --template-dir assets/<name> --output-dir <dir>
• Asset is self-contained (no references to library/helpers.tmpl or other assets)
• tests/configs/assets/sdp_expectation_notifications.json added
• Asset appears in ASSETS.md catalog

Live validation (playground, 2026-07-11, CLI v0.297.2)

Installed from this branch into a fresh bundle and validated end to end on a Free Edition workspace: bundle validate clean on first try; pipeline update a8b9fec1 completed on serverless with the hook registered (hook_progress: ENABLED); driver log carried the exact notification line (failed=3003 | passed=18929, matching the event log per update); backstop alert evaluated on its cron to TRIGGERED (evaluated value 3003) and the email was delivered and confirmed.

Release (this PR cuts v1.11.0)

• CHANGELOG.md finalized: [Unreleased] renamed to [1.11.0] - 2026-07-11, fresh empty [Unreleased] added above
• Both version markers bumped to 1.11.0 (pyproject.toml and template/{{.project_name}}/bundle_init_config.json.tmpl)
• Version guard test passes (tests/test_release_metadata.py, 4 passed)

Checklist

• Go template syntax is valid (no unclosed {{ }} blocks)
• No .tmpl files appear in generated output
• Generated YAML files are valid
• Documentation updated