feat(java): trace Spring/MyBatis enterprise flow end-to-end (#389)

[colbymchenry]

Summary

Closes the three threads of #389 so an agent can trace HTTP route → @Controller → field-injected service → impl → DAO/Mapper → MyBatis XML SQL end-to-end on real Spring + MyBatis projects, with no Read/Grep fallback.

• Field-injected concrete-bean trace. Java this.<field>.method() is unwrapped at extraction (was emitted verbatim as this.userbo.method and dropped through every name-matcher strategy). The receiver name is then looked up in the enclosing class's field declarations to get the declared type and resolve the method on it — closes the controller→bean hop when the field name doesn't capitalize to the type (userbo → UserBO). General Java fix, not Spring-specific.
• MyBatis XML mapper as a first-class language. New mybatis-extractor.ts parses <mapper namespace="..."><select|insert|update|delete|sql id="X"> and emits method-shaped nodes qualified <namespace>::<id>, plus <include refid="X"/> refs to <sql> fragments. Non-mapper XML (pom, log4j, web.xml) → file node only. New mybatisJavaXmlEdges synthesizer joins Java mapper methods to XML statements by suffix-matching qualified names; ambiguous simple-name collisions dropped for precision.
• Spring @Value / @ConfigurationProperties → application config. application.{yml,yaml,properties} + profile variants parse on the framework path; each leaf key becomes a constant node qualified by its dotted path. @Value("${k}") / @Value("${k:default}") and @ConfigurationProperties(prefix="X") emit binding nodes resolved with Spring's relaxed binding (kebab↔camel↔snake).

Validation

Real-world repo: macrozheng/mall-tiny (Spring MVC + MyBatis Plus).

Full chain trace(UmsRoleController.listResource → UmsResourceMapper.getResourceListByRoleId-xml) connects across 5 hops via static + synthesized edges. 11/11 @Value annotations resolve (incl. @ConfigurationProperties(prefix="secure.ignored")); 6/6 custom-SQL mapper methods bridge to XML.

Test plan

• Repro the issue's exact example (UserAction @Resource(name="userBO") UserBO) on a temp Spring project — confirm UserAction.toLogin2 → UserBO.toLogin2 edge appears (was missing)
• 4 new integration tests in __tests__/frameworks-integration.test.ts (bean injection, MyBatis bridge, @Value/relaxed binding, non-MyBatis XML noise-free)
• Full test suite: 1005 passed, 0 new failures
• End-to-end flow on mall-tiny: controller → service-iface → impl → mapper-iface → XML

Docs

• CHANGELOG.md [Unreleased] entry (Added section)
• docs/design/dynamic-dispatch-coverage-playbook.md matrix row + narrative

Closes #389.

🤖 Generated with Claude Code