chore(migration): switch org to wickra-lib and maintainer email to wickra.lib@gmail.com (#59)

Introduce repo-metadata.toml as single source of truth for repo identity
(org slug, maintainer email, canonical URLs) and add sync-metadata.yml
workflow with a Python audit script that fails CI if any tracked file
drifts back to pre-migration values.

Bulk-replace across 24 tracked files:
- kingchenc/wickra -> wickra-lib/wickra (URL segment)
- kingchencp@gmail.com -> wickra.lib@gmail.com (maintainer email)
- @kingchenc -> @wickra-lib (CODEOWNERS mention only)

Person-name credits are preserved: LICENSE copyright holder, Cargo.toml
authors handle, and CHANGELOG historical @kingchenc reference all remain
unchanged. Crate / PyPI / npm package names also untouched.

Merge this PR only after the kingchenc/wickra -> wickra-lib/wickra org
transfer has happened on the GitHub side, otherwise all badges and
repository links 404 until the transfer is performed.

bindings/python/pyproject.toml

@@ -8,7 +8,7 @@ version = "0.2.7"
 description = "Streaming-first technical indicators: incremental, fast, install-free."
 readme = "README.md"
 license = { text = "PolyForm-Noncommercial-1.0.0" }
-authors = [{ name = "kingchenc", email = "kingchencp@gmail.com" }]
+authors = [{ name = "kingchenc", email = "wickra.lib@gmail.com" }]
 requires-python = ">=3.9"
 keywords = ["finance", "trading", "indicators", "technical-analysis", "ta-lib"]
 classifiers = [
@@ -47,9 +47,9 @@ bench = [
 ]
 
 [project.urls]
-Homepage = "https://github.com/kingchenc/wickra"
-Repository = "https://github.com/kingchenc/wickra"
-Issues = "https://github.com/kingchenc/wickra/issues"
+Homepage = "https://github.com/wickra-lib/wickra"
+Repository = "https://github.com/wickra-lib/wickra"
+Issues = "https://github.com/wickra-lib/wickra/issues"
 
 [tool.maturin]
 manifest-path = "Cargo.toml"