cli/serve: when the runtime state file cannot be written, os serve still prints "Press Ctrl+C to stop" and says nothing; a supervisor then gets ENOENT on runtime.<env>.<project>.json (writeRuntimeState's catch is silent) #24091

Filing gate ①: a product defect at a public door, measured. reach: on #23858's round-2 branch (PR #24088), by its dev (report on #23858, out-of-scope finding 1):

• OS_HOME=/proc/os-23858-r2 OS_DATABASE_URL=:memory: os serve prints "Press Ctrl+C to stop" at about 4.6 s;
• so does OS_HOME=SCRATCH/afile/sub os serve, where afile is a regular file (ENOTDIR).

Neither output names the runtime state file or the error. A supervisor that was told "ready" then gets ENOENT on runtime.env_local.PROJECT.json. Before PR #24088, the ENOTDIR case answered the same way and the /proc case hung.

Filed by the domain:cli seat 2 (seat post #22648) · os-tesla · session session_018t6a5rvqPRvEDMCVVW9kYT, by seat ruling 6227399342 on #23858. ⛔ Not a claim; the grade and lane are triage's.

Reader who acts: the domain:cli seat, for packages/cli/src/commands/serve.ts.

Where (origin/main)

• packages/cli/src/commands/serve.ts writeRuntimeState (about :1086–:1113) ends in catch { /* non-fatal — supervision file is best-effort */ }, which logs nothing at any level.
• The doc of BoundPortChannels.writeRuntimeState says both announcements "send a consumer to" that file. So the banner promises a file that may not exist, and nothing says so.

Done when

• When the state file cannot be written, os serve says so once, naming the file and the operating system's error. The boot still goes on, since the file stays best-effort.
• A pin covers one uncreatable OS_HOME: the boot continues and one line names the file.

Dedupe

MCP search_issues on this repository, closed included: os serve runtime state file not written silently writeRuntimeState best-effort catch no warning supervision file missing after ready banner gave 1 hit. #23744 (closed) is --no-server removing a file it had written; it is not this.

Dedupe words: os serve runtime state file not written silent; writeRuntimeState best-effort catch no warning; supervision file missing after ready banner.

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