chore: update to OpenSTA 3.0

[donn]

• update Silimate/OpenSTA to version including OpenSTA 3.0's changes
• update findPathEnds invocation
• update jsonName to use string_views

---

Depends on merge of Silimate/OpenSTA#56

[greptile-apps]

Greptile Summary

This PR updates the OpenSTA submodule to version 3.0 and adapts src/Silisizer.cpp to its revised API.

• findPathEnds call: The corner parameter (previously nullptr) is replaced with sta_->scenes(), and the groups parameter changes from a StringSeq* nullable pointer to a by-value empty sta::StringSeq, matching the new OpenSTA 3.0 signature.
• jsonName function: Signature updated from const char* to std::string_view; the loop now uses pointer bounds derived from s.data() / s.data() + s.length() instead of null-termination, and a reserve call is added for performance.
• Submodule bump: third_party/OpenSTA moves from commit 5c5b9c5 to 2d2cfe6, contingent on upstream PR merge OpenSTA 3.0 upstream/master into silimate/main OpenSTA#56 being merged first.

Confidence Score: 4/5

Safe to merge once the upstream OpenSTA PR #56 is merged; the code changes are minimal and correctly track the new API.

Both API adaptations are mechanically straightforward. The findPathEnds call correctly passes sta_->scenes() in place of the old corner pointer and an empty StringSeq in place of the old nullptr groups pointer. The jsonName change to std::string_view is safe and correct. The only comments are style suggestions; there are no functional regressions in the changed code.

No files require special attention beyond confirming the upstream OpenSTA submodule PR is merged before this one lands.

Important Files Changed

Filename	Overview
src/Silisizer.cpp	Adapts two OpenSTA 3.0 API changes: replaces corner/nullptr with scenes/StringSeq in findPathEnds, and updates jsonName to accept std::string_view. Logic is sound with minor style verbosity.
third_party/OpenSTA	Submodule bump from 5c5b9c5 to 2d2cfe6 to track OpenSTA 3.0. Depends on upstream PR #56 being merged first.

Sequence Diagram

sequenceDiagram
    participant Silisizer
    participant OpenSTA as OpenSTA 3.0 (sta_)
    participant Network

    loop Each optimization iteration
        Silisizer->>OpenSTA: scenes()
        OpenSTA-->>Silisizer: SceneSeq

        Silisizer->>OpenSTA: "findPathEnds(scenes, StringSeq{}, ...)"
        OpenSTA-->>Silisizer: PathEndSeq ends

        alt ends is empty
            Silisizer-->>Silisizer: break (done)
        else violations found
            loop Each PathEnd
                Silisizer->>Network: instance(pin), cell(inst), libertyCell(cell)
                Network-->>Silisizer: "LibertyCell* libcell"
            end
            Silisizer->>OpenSTA: replaceCell(offender, to_cell)
        end
    end

    Silisizer->>Network: "pathName(inst), lc->name()"
    Network-->>Silisizer: string_view
    Silisizer->>Silisizer: jsonName(string_view) → stripped string

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_{Reviews (1): Last reviewed commit: "chore: update to OpenSTA 3.0" | Re-trigger Greptile}