Keep local microscaler-observability as a path dep; rewrite to git only in GitHub Actions

[Copilot]

Local development expects microscaler-observability to come from the sibling checkout at ../microscaler-observability, but the previous change converted it to a git dependency globally. This change restores the local path dependency and moves the git switch into GitHub Actions so CI can rewrite the manifest at runtime.

• Dependency resolution

  • Restore microscaler-observability in Cargo.toml to the local sibling path:

    microscaler-observability = { path = "../microscaler-observability" }

  • Update Cargo.lock to match the path-based local-dev state.

• GitHub Actions runtime rewrite

  • Add a workflow step in ci.yml to rewrite the dependency before any Cargo commands run.
  • Add the same rewrite in docs.yml so doc builds do not depend on the sibling checkout existing on runners.

• CI-only switch behavior

  • GitHub runners now patch Cargo.toml in-place to use the hosted repo:

    sed -i 's|microscaler-observability = { path = "../microscaler-observability" }|microscaler-observability = { git = "https://github.com/microscaler/microscaler-observability.git", branch = "main" }|' Cargo.toml

  • This preserves the existing local dev workflow while keeping CI self-contained.

• Repo docs

  • Add a short llmwiki/log.md note documenting the local-vs-CI dependency policy for this repo.