Fix symbol-accurate declared-cycle tracking for overloaded mappings

[AGiorgetti]

Summary

Declared-cycle analysis keys generated mappings by method name, and tracker argument injection rewrites generated expression text by name. Overloaded mapping methods can therefore be falsely identified as recursive or receive tracker arguments intended for another overload.

Evidence

FindRecursiveDeclaredMappingNames groups models by Method.Name at src/Mammoth.LiteMapper.Generator/LiteMapperGenerator.cs:3898. Call detection and tracker-call injection use textual searches beginning at lines 4268 and 4321.

Impact

A ThrowOnCycle mapper with overloaded generated Map methods can allocate a tracker for an acyclic graph. A compatible marked converter overload such as Map(string) may be rewritten with unsupported tracker/path parameters, causing consumer compilation failure.

Acceptance criteria

• Add a failing compile-and-run regression with overloaded declared mappings and a converter overload sharing the method name.
• Identify declared mapping graph vertices and call edges by symbol identity/signature, not method name or rendered expression text.
• Forward tracker state only through actual recursive declared mapping edges.
• Preserve the no-tracker-allocation guarantee for non-recursive public mappings.
• Verify focused recursion tests and required full validation suite pass.

Specification references

Sections 14.1, 17.1-17.6, 19.8, 21.4, and 22.14.

[AGiorgetti]

Agent claim registered for autonomous execution.

[AGiorgetti]

AgentStack Protocol: execution-plan

1. Add a compile-and-run regression covering overloaded declared mappings plus a same-name converter overload; establish a failing baseline. 2. Trace mapping model/call-edge construction and generated call rendering to replace method-name/text matching with symbol/signature identity. 3. Implement the smallest deterministic fix that forwards tracker state only across recursive declared mapping edges. 4. Run focused recursion tests, full generator tests, Release build, and full solution tests; record evidence and submit a PR for review.

[AGiorgetti]

AgentStack Protocol: progress

• Implementation complete in commit 33994a3. Added symbol-identity declared call metadata and marker rendering
• added acyclic and true-recursive overload regressions. Focused recursion tests: 27/27 passed. Full generator tests: 567/567 passed. Release build: zero warnings/errors. Full Release solution tests: 631 passed, 1 expected Native AOT prerequisite skip. Branch push is pending explicit session authorization.