Fix cached URL Option A playback behavior in spring example

[sloppylopez]

Motivation

• Parameterized playback with Option A requires the test target URL to be resolved at request time so each invocation uses its per-invocation WireMock port.
• The example previously cached the base URL at bean construction which reproduces the same failure mode seen in nh-api-bp FullFlowFlexibleIT (requests stuck on the class-level port and returning 404).

Description

• Changed CachedBaseUrlClient to read app.postmanecho.url from Spring Environment at request time and to fail fast when the property is missing.
• Reworked CachedUrlFailsWithOptionAIT into a validating playback test that asserts HTTP 200 and verifies the expected id is present in each parameterized response.
• Updated UserController comment for /api/postmanecho/cached-users/{id} to clarify the endpoint covers a non-Feign, request-time URL resolution path.

Testing

• Attempted to run the focused Gradle test ./gradlew :examples:spring-boot-example:test --tests "example.flow.CachedUrlFailsWithOptionAIT", but the Gradle wrapper download was blocked by a network/proxy error (HTTP/1.1 403 Forbidden).
• Performed automated repository checks (git status, git diff) and file inspections to verify the intended code changes and committed the patch successfully.

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Codex Task

[Copilot]

Pull request overview

This PR updates StableMock’s Spring Boot example and core StableMock utilities to improve parameterized playback behavior (Option A) and make recorded artifacts/matching more robust.

Changes:

• Update the Spring example client to resolve app.postmanecho.url at request time (instead of caching it at bean construction).
• Extend StableMock core to support dropping response headers from recorded stubs and filtering out certain scoped-request identity/plan ignore patterns at load time.
• Refresh example recorded fixtures and add focused unit tests for header-ignore, ignore-pattern filtering, and invocation-dir matching.

Reviewed changes

Copilot reviewed 207 out of 261 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/test/java/com/stablemock/core/storage/SingleAnnotationMappingStorageHeaderIgnoreTest.java	Adds tests validating response-header removal behavior for recorded mappings.
src/test/java/com/stablemock/core/analysis/AnalysisResultStorageTest.java	Adds test ensuring scoped-request identity/plan ignore patterns are filtered out at load time.
src/test/java/com/stablemock/StableMockExtensionTest.java	Adds test for stricter parameterized invocation directory matching.
src/main/java/com/stablemock/core/storage/MappingStorage.java	Extends mapping save API to pass through ignore-response-headers configuration.
src/main/java/com/stablemock/core/analysis/AnalysisResultStorage.java	Adds overload + filtering logic for scoped-request identity/plan ignore patterns.
src/main/java/com/stablemock/U.java	Expands @U annotation with ignoreResponseHeaders and paths options and updates documentation.
examples/spring-boot-example/src/main/java/example/CachedBaseUrlClient.java	Resolves base URL from Environment per request to support Option A per-invocation ports.
examples/spring-boot-example/src/test/java/example/flow/ParameterizedStableKeyScenarioIT.java	Updates class-level comment to clarify regression intent.
examples/spring-boot-example/src/test/resources/**	Updates/refreshes recorded StableMock fixtures and analysis artifacts used by example tests.

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