fix: restore ICS55 runtime harden export semantics

[zhaoxueyan1]

No description provided.

[Copilot]

Pull request overview

This PR restores/strengthens ICS55 “runtime” export behavior by ensuring database/timing singletons can be safely re-initialized between runs, and by hardening STA characterization/analysis paths when clock data is missing.

Changes:

• Add idm::DataManager::reset() and use it in iSTA tests to ensure clean re-initialization.
• Improve iSTA behavior when I/O delays / launch clock data are missing (synthesize defaults; skip unsafe setup/hold analysis).
• Add ICS55 GCD runtime/integration test helpers and new GTest coverage for Python export APIs (LEF / liberty).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/platform/data_manager/idm.h	Declare DataManager::reset() for explicit singleton re-init.
src/platform/data_manager/idm.cpp	Implement DataManager::reset() clearing builder/config pointers.
src/database/manager/builder/builder.cpp	Ensure IdbBuilder destructor frees owned DEF/LEF services.
src/operation/iSTA/test/CharacterTimingTestCommon.hh	Add ICS55 GCD test configuration/runtime setup helpers; reset singletons between runs.
src/operation/iSTA/test/Ics55GcdExportTest.cc	New GTests validating runtime exports (abstract LEF + timing model) for ICS55 GCD.
src/operation/iSTA/test/CharacterTimingTest.cc	Reset timing/STA/DM singletons in test teardown/setup paths.
src/operation/iSTA/source/module/sta/StaCharacterTiming.cc	Synthesize default input arrival data when no IO delay constraints exist.
src/operation/iSTA/source/module/sta/StaAnalyze.cc	Guard setup/hold analysis against missing launch/capture clock binding.

Comments suppressed due to low confidence (1)

src/operation/iSTA/test/CharacterTimingTestCommon.hh:35

• This header uses std::all_of (in ics55GcdCaseAvailable) and std::make_unique (in prepareIcs55GcdTimingRuntime) but does not include / . This can fail to compile depending on transitive includes. Add the missing standard headers here explicitly.

#include "api/TimingEngine.hh"
#include "api/TimingIDBAdapter.hh"
#include "idm.h"
#include "sta/Sta.hh"
#include "timing_api.hh"
#include "gtest/gtest.h"

#include <cstdlib>
#include <filesystem>
#include <fstream>
#include <mutex>
#include <regex>
#include <string>
#include <string_view>
#include <system_error>
#include <unordered_map>
#include <vector>

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