fix(config-rom): reject suspended generation exports

[gly11]

Summary

• make ConfigROM selector 14 reject suspended cache entries
• suspend cached ROM visibility on the bus-reset edge while preserving internal lifecycle access
• add regression coverage for exact-generation exports and controller reset dispatch

Problem

ExportConfigROM documents exact-generation lookup with no stale fallback, but it called the ConfigROMStore overload that returns suspended entries. A bus reset between a client generation read and selector 14 could therefore return a complete ROM from the previous generation and let the client reuse stale node routing information.

The cache also remained export-visible until later rediscovery work updated it, leaving a reset window in which stale bytes could still be returned.

Fix

Use FindByNode(generation, node, false) in the user-client handler. The existing not-cached path then returns empty data for suspended entries, while internal callers can still opt into suspended cache access.

On the controller's bus-reset edge, suspend the ROM cache alongside the existing route and lease invalidation, before protocol producers are notified. The migration preserves dev's current reset ordering.

Verification

• ConfigROMStoreConcurrencyTests: 8/8 passed
• ControllerCoreBusResetTests: 1/1 passed
• full C++ host suite: 1,542/1,542 passed, 6 conditional skips
• pinned XcodeGen regeneration produced no tracked project drift
• git diff --check
• GitHub Build and Test: passed on the stacked dev head
• no dext install or hardware mutation was required

Dependency and merge order

Depends on #88. This PR targets dev and is stacked directly on the current #88 head.

This PR is a sibling of #84, not a child of it: #84 and #87 have no code dependency and may be reviewed or merged in either order after #88.

Until #88 merges, GitHub's Files changed view will also include #88's CI/project-generation changes. The #87-specific review scope is the top three Config ROM commits and these five files:

• ASFWDriver/Controller/ControllerCoreInterrupts.cpp
• ASFWDriver/UserClient/Handlers/ConfigROMHandler.cpp
• tests/core/CMakeLists.txt
• tests/core/ControllerCoreBusResetTests.cpp
• tests/discovery/ConfigROMStoreConcurrencyTests.cpp

Intended merge order:

1. merge fix(build): pin XcodeGen for CI and local builds, stabilize test failure reporting #88 into dev;
2. update fix(config-rom): reject suspended generation exports #87 onto the resulting dev tip if GitHub does not collapse the stacked diff automatically, retaining only the three Config ROM commits;
3. merge fix(async): complete block writes from OUTPUT_LAST status #84 and fix(config-rom): reject suspended generation exports #87 in either order after their checks pass.

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