dispatch: suggest --repos only where the flag is accepted

[gtrrz-victor]

https://entire.io/gh/entireio/cli/trails/1498

Follow-up to #2667 (trail 1489: dispatch from Entire-native checkouts).

Problem

resolveOriginRepoSlug is shared by cloud and local dispatch, and all three of its errors told the user to "pass --repos". Local mode refuses that flag (--repos cannot be used with --local), so entire dispatch --local in a checkout whose origin Entire cannot address (e.g. a gitlab.com remote) pointed the user at a flag that then fails.

Fix

• The shared helper's errors name no flag.
• The cloud caller (runServer) adds (or pass --repos gh/<owner>/<repo> or et/<project>/<repo> to name the repo) when wrapping the error, so cloud users get the same guidance as before.

Tests

• New TestLocalMode_UnknownOriginHostDoesNotSuggestRepos: fails on main (error says "pass --repos to name the repo"), passes with the fix.
• Existing TestServerMode_UnknownOriginHostIsAnError still requires the --repos hint in cloud mode.
• mise run lint clean; integration tests and the Vogon canary pass. Two unrelated local failures in mise run check: TestDialLatencies (timing flake, passes on rerun) and TestPlugin_SpawnsHooksUnderNode (no global node version in the local mise setup).

🤖 Generated with Claude Code

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Note

Low Risk
User-facing error text only; behavior unchanged aside from removing a misleading flag hint in local mode.

Overview
Fixes misleading --repos hints when entire dispatch --local cannot resolve the checkout’s origin.

resolveOriginRepoSlug is shared by cloud and local dispatch; its errors no longer mention --repos (local mode rejects that flag). Cloud dispatch in runServer wraps those failures with (or pass --repos … to name the repo) so server users keep the same escape hatch.

Adds TestLocalMode_UnknownOriginHostDoesNotSuggestRepos (e.g. GitLab origin): error should name the host but must not contain --repos.

^{Reviewed by Cursor Bugbot for commit ccfaa45. Configure here.}

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused error-message change is correctly scoped and covered by local and existing cloud tests.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes misleading --repos guidance in local dispatch while preserving it for cloud dispatch.

Changes:

• Removes flag-specific hints from shared origin-resolution errors.
• Adds cloud-only --repos guidance.
• Tests unsupported local origins.

File	Description
mode_local.go	Makes shared errors mode-neutral.
mode_cloud.go	Adds cloud-specific recovery guidance.
mode_local_test.go	Verifies local errors omit --repos.

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