feat: upgrade shaded Jetty from 11.0.26 to 12.1.8

Jetty 12 is a major release with a minimum Java 17 requirement and
several HTTP/2 client API breaking changes. This commit migrates to
the new API while preserving all 80 existing tests (0 failures,
83.99% coverage, above the 81% threshold).

Changes:
- modules/jetty-shaded/pom.xml: rename artifact http2-client →
  jetty-http2-client and align both deps to 12.1.8
- project.clj: javac-options -source/-target 11 → --release 17
- jetty.clj: migrate six breaking API changes:
  * MetaData.getFields() → getHttpFields()
  * DataFrame.getData() → getByteBuffer()
  * Stream.Listener.onData push-model → onDataAvailable pull-model
    (stream.readData() + stream.demand() + data.release())
  * onReset and onIdleTimeout new signatures
  * Session.Listener.Adapter removed; replaced with proxy implementing
    all nine Session.Listener methods explicitly (proxy required over
    reify due to cloverage instrumentation limitations with default
    interface methods)

Signed-off-by: Greg Haskins <greg@manetu.com>

feat: migrate to Pedestal 0.8.x connector API

Replace the legacy io.pedestal.http service map pattern (provider/config)
with the Pedestal 0.8.x PedestalConnector protocol. create-connector now
returns an UndertowConnector record managed via conn/start! and conn/stop!.

- Upgrade pedestal.{log,service,error} 0.7.2 → 0.8.1
- Replace provider/config with create-connector returning UndertowConnector
- Update all tests to use conn/start!, conn/stop!, conn.test/response-for
- Add cheshire 5.13.0 to test dependencies
- Name error-interceptor for better diagnostics

N.B. This is a breaking change!  We will be releasing this under v3.x and posting
a migration guide.

Signed-off-by: Greg Haskins <greg@manetu.com>

fix: fix Maven Clojars credentials and add jetty-shaded badge

jetty-shaded-deploy now generates a temporary settings.xml referencing
${env.CLOJARS_USERNAME} and ${env.CLOJARS_PASSWORD} (credential values
never touch disk), so make deploy works identically locally and in CI
using a single credential pair. Remove the now-redundant MAVEN_* env
vars and server-id config from release.yml. Add a Clojars badge for
jetty-shaded to README.

Signed-off-by: Greg Haskins <greg@manetu.com>

ci: migrate to GitHub Actions and add tag-driven Clojars publishing

Replace CircleCI with GitHub Actions for CI builds and releases. A
new deploy workflow fires on v* tags, stamps the release version
ephemerally from the tag, and publishes all five artifacts to Clojars
(jetty-shaded via mvn deploy, lein modules via lein sub deploy clojars).

- Makefile: add deploy target; fix set-version sed for Linux (sed -i.bak)
- project.clj: add :deploy-repositories with CLOJARS_* env var substitution
  inherited by all four lein modules via lein-parent
- All modules: sentinel version 0.0.0-SNAPSHOT (tag alone marks releases)
- README: swap CircleCI badge for GitHub Actions badge

Signed-off-by: Greg Haskins <greg@manetu.com>

Release v2.12.0

Changes since v2.11.0
---------------------
91f293f chore: bump to v2.12.0-SNAPSHOT and update dependencies

Signed-off-by: Greg Haskins <greg@manetu.com>

Release 2.11.0

This release updates some major dependencies, such as clojure and pedestal, thus the version bump

Changes since v2.10.0
---------------------
1f7d965 Update deps

Signed-off-by: Greg Haskins <greg@manetu.com>

Release v2.10.0

Changes since v2.9.0
--------------------
6b2bec2 Remove core.async go-routines from LPM flow

Signed-off-by: Greg Haskins <greg@manetu.com>

Release 2.9.0

Changes since 2.8.2
-------------------
9e77523 Use vthreads when available

Signed-off-by: Greg Haskins <greg@manetu.com>

Release v2.8.2

Changes since v2.8.1
--------------------
ca1ac62 Upgrade deps
b35a064 Revert "Use case-insensitive regex ..."
f7952c1 Use case-insensitive regex instead of bulk-converting all headers to lower-case

Signed-off-by: Greg Haskins <greg@manetu.com>

Release v2.8.1

Changes since v2.8.0
--------------------
89291e5 grpc-client (jetty): Provide `on-close` callback to `connect`

Signed-off-by: Greg Haskins <greg@manetu.com>