docs: record the wake-up adapter and require roadmap updates

[cardmagic]

Milestone 2 shipped in #14 without the roadmap being updated, so it still claimed PostgreSQL LISTEN/NOTIFY was not implemented and described the cross-process polling delay as the largest unaddressed latency term.

This is the second time a release landed without the roadmap following, so this PR fixes both the stale content and the process that let it go stale.

Roadmap

• The adapter as implemented, with its measured 103.7 ms to 2.9 ms p50 improvement
• Why it is opt-in rather than automatic: a connection per waiting thread outside the pool, and LISTEN not surviving a transaction-pooling proxy
• That MySQL has no notification primitive and keeps polling
• Milestone 2 reduced to the remaining Redis adapter

AGENTS.md

Requires docs/roadmap.md to be updated in the same pull request whenever a change alters what the project claims about itself: completing or advancing a milestone, moving an entry between implemented and partially implemented, or discovering a limitation worth recording such as a capability that turns out to be opt-in, adapter-specific, or measured rather than assumed.

Two points made explicit, because both were the actual failure modes here: prefer correcting a stale entry over only appending a new one, since an inaccurate claim misleads more than a missing one; and state what was measured and what was not, so a reader can tell evidence from intent. Defect fixes, tooling, and prose changes are exempt.

Documentation only. No version bump.

bundle exec rake   # 301 runs, 0 failures

[greptile-apps]

Greptile Summary

The roadmap now records the shipped opt-in PostgreSQL LISTEN/NOTIFY wake-up adapter and its measured latency improvement.

• Documents the adapter’s connection cost and transaction-pooling limitation.
• Clarifies that MySQL continues polling.
• Narrows Milestone 2 to the remaining optional Redis adapter.

Confidence Score: 5/5

The documentation-only PR appears safe to merge.

The updated roadmap claims are consistent with the adapter implementation, integration coverage, benchmark documentation, and current backend behavior.

Important Files Changed

Filename	Overview
docs/roadmap.md	Accurately updates implemented capabilities, operational constraints, benchmark results, and remaining wake-up work.

_{Reviews (1): Last reviewed commit: "docs: record the PostgreSQL wake-up adap..." | Re-trigger Greptile}