fix(image): copy tooling/sql into the build stage

[sajonaro]

The failure

The publish run stopped in stage 1:

File "tooling/cli/dune", line 34, characters 61-69:
34 |  (libraries writ_data writ_syntax writ_runtime writ_loadpath writ_sql))
                                                                  ^^^^^^^^
Error: Library "writ_sql" not found.
-> required by library "writ_cli" in _build/default/tooling/cli

Why

The Dockerfile enumerates the source directories the build stage needs, one COPY per library — deliberately, since that list is the check that writ and writ-mcp are a small closed set. writ_cli gained a dependency on writ_sql; the list did not gain tooling/sql.

It builds everywhere else because everywhere else has the whole tree. Only the image sees the subset, and nothing builds the image on push — image.yml fires on a v* tag or by hand — so the drift stayed invisible until publish.

The change

One COPY, plus a note in the comment block above the list recording this failure mode, since the list reads like documentation and is load-bearing.

Verification

Local docker build, changed layer uncached:

• stage 1 compiled writ.exe and writ_mcp.exe
• the in-Dockerfile smoke checks passed: writ check → states: 2, writ derive → (3 rows), writ-mcp initialize → protocolVersion
• docker run --rm <image> --version → writ 0.1.0
• writ sql — the verb the missing library backs — runs in the finished image

Checked the rest of the closure against the dune files: writ.exe needs writ_data, writ_syntax, writ_runtime, writ_loadpath, writ_sql; writ_mcp.exe adds writ_json and writ_mcp. tooling/sql was the only gap.

🤖 Generated with Claude Code