feat(qor): add ECC QoR v3 analysis engine (dimensions, feasibility, interventions, reports)

[Yell-walkalone]

What Changed

• feat(qor): add ECC QoR v3 engine — new chipcompiler/analysis/qor/ package (metric registry, payload loader, schema validation, five-dimension scoring, feasibility gates, evidence tracking, root-cause diagnosis, tiered interventions, calibration, compatibility layer, text renderer); engine/qor_report.py reduced to a thin facade over the new package; the flow engine refreshes home/qor_report.json after each successful step; CLI report qor / report checklist wired to the new engine; dedicated test suite under test/analysis/qor/
• fix(qor): harden report inputs and STA fallbacks — stricter input validation in loader/schema/evidence/features; missing or partial STA corner data degrades gracefully instead of failing the report
• fix(qor): expose power observations in reports — dynamic/leakage/total power observations surfaced through models/schema/loader and rendered in the report, with or without a configured power budget
• docs(qor): add ECC QoR v3 reference manuals — chipcompiler/docs/ecc-qor-ref.en.md / .cn.md covering dimensions, scoring rules, gates, interventions, and payload examples

Scope

Select the areas touched by this PR:

• CLI - command behavior, Typer command surface, output formats, or workspace commands.
• Flow/runtime - workspace lifecycle, EngineFlow, step execution, logs, metrics, or artifacts.
• EDA integration - Yosys, ECC-Tools, DreamPlace, KLayout, PDKs, or native/runtime wrappers.
• Build/package - Nix, PyInstaller, wheels, uv.lock, or release artifacts.
• CI/release - GitHub Actions, version checks, changelog, or release automation.
• Tests/docs only

Runtime And Packaging Impact

• No runtime or packaging impact
• CLI output or machine-readable contract changed
• Workspace layout, flow state, or artifact paths changed
• Native toolchain or wrapper behavior changed
• ecc-tools or ecc-dreamplace dependency changed
• PyInstaller, Nix, or release artifact changed

Notes:

Validation

List the commands you ran. Mark checks that are not applicable as N/A.

• uv run pytest test/
• uv run ruff check chipcompiler test
• uv run ruff format --check chipcompiler test
• PyInstaller smoke: ecc --help, ecc --version, ecc version --json
• Nix smoke: nix run .#cli -- --help
• Manual flow smoke:
• Other:

Skipped checks and reason:

Checklist

• I kept the change scoped to ECC.
• I updated docs or user-facing CLI text where behavior changed.
• I included lockfile or version metadata updates when dependencies changed.
• I documented any submodule updates and why they are needed.
• I did not include local caches, virtual environments, or generated build outputs.
• I explained skipped validation and remaining risk.