cflite_pr: gitbot-shared-context path-dep needs proper vendoring

[hyperpolymath]

Closing #66 marked the cflite_pr job continue-on-error: true as a placeholder while the real fix is figured out. The underlying issue:

Cargo.toml declares

gitbot-shared-context = { path = "../../shared-context" }

but .clusterfuzzlite/Dockerfile only COPY . /src/echidnabot — the sibling crate isn't in the build context, so cargo fuzz build errors with unable to update /shared-context.

Resolution options

1. Vendor inline — cargo vendor the dep into vendor/shared-context and switch the manifest dep to { path = "vendor/shared-context" }. Simple but duplicates source.
2. Git-dep — replace path dep with { git = "https://github.com/hyperpolymath/gitbot-shared-context", rev = "<sha>" } (or wherever shared-context lives). Cleanest. Requires the sibling repo to be publishable.
3. Dockerfile context bump — change COPY . /src/echidnabot to COPY echidnabot /src/echidnabot + COPY shared-context /src/shared-context and adjust .clusterfuzzlite invocation to run from the parent directory. Hardest to wire through CI.

Recommend option 2 if the sibling repo exists publicly; otherwise option 1.

Once chosen + landed, REMOVE continue-on-error: true from cflite_pr.yml and CLOSE this issue.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com