fix(cli): Use correct CLI command for auth login references

[thecodedrift]

All user-facing references to taskless auth login assumed the CLI was
installed globally, which is unlikely in agent environments. Agents would
waste tokens attempting commands that don't exist, then self-correct.

CLI error messages now dynamically detect the invoking package manager
via npm_config_user_agent (pnpm dlx, yarn dlx, bunx) and fall back
to npx. This is handled by a new getCliPrefix() utility used in
identity.ts, token.ts, and rules.ts.

Skills and commands now default to npx @taskless/cli@latest (the most
universal runner) and include a package manager detection note instructing
agents to prefer the project's lockfile-indicated manager.

Static help text files (rules-create.txt, rules-improve.txt) use npx
since they can't be dynamic.

Fixes #12

[Copilot]

Pull request overview

This PR updates user-facing auth login references to avoid assuming a globally-installed taskless binary, improving usability in agent/ephemeral environments by defaulting to npx @taskless/cli@latest and making CLI error messages suggest the invoking package manager.

Changes:

• Added a new getCliPrefix() utility that detects the invoking package manager via npm_config_user_agent and uses it in CLI error messages.
• Updated skills and tskl/* command docs to default to npx @taskless/cli@latest, with guidance on using lockfile-indicated package managers.
• Updated static CLI help text (rules-create.txt, rules-improve.txt) to reference npx @taskless/cli@latest auth login.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 18 comments.

Show a summary per file

File	Description
skills/taskless-logout/SKILL.md	Switches example invocations to npx and adds package-manager guidance.
skills/taskless-login/SKILL.md	Switches example invocations to npx and adds package-manager guidance.
skills/taskless-info/SKILL.md	Switches example invocations to npx and adds package-manager guidance.
skills/taskless-improve-rule/SKILL.md	Updates multiple CLI invocations and auth remediation guidance to npx.
skills/taskless-improve-rule-anonymous/SKILL.md	Switches verify/delete examples to npx and adds package-manager guidance.
skills/taskless-delete-rule/SKILL.md	Switches help/delete examples to npx and adds package-manager guidance.
skills/taskless-create-rule/SKILL.md	Switches create/meta/auth remediation examples to npx and adds package-manager guidance.
skills/taskless-create-rule-anonymous/SKILL.md	Switches verify/schema examples to npx and adds package-manager guidance.
skills/taskless-check/SKILL.md	Switches check/init examples to npx and adds package-manager guidance.
packages/cli/src/util/package-manager.ts	Introduces getCliPrefix() for dynamic, package-manager-specific command suggestions.
packages/cli/src/help/rules-improve.txt	Replaces bare taskless auth login prerequisite with npx @taskless/cli@latest auth login.
packages/cli/src/help/rules-create.txt	Replaces bare taskless auth login prerequisite with npx @taskless/cli@latest auth login.
packages/cli/src/auth/token.ts	Updates legacy-auth warning to use getCliPrefix()-based login instruction.
packages/cli/src/auth/identity.ts	Updates auth-required / missing-orgId errors to use getCliPrefix()-based login instruction.
packages/cli/src/api/rules.ts	Updates API error guidance strings to use getCliPrefix()-based login instruction.
commands/tskl/rule.md	Switches documented invocations to npx and adds package-manager guidance.
commands/tskl/logout.md	Switches documented invocations to npx and adds package-manager guidance.
commands/tskl/login.md	Switches documented invocations to npx and adds package-manager guidance.
commands/tskl/info.md	Switches documented invocations to npx and adds package-manager guidance.
commands/tskl/improve.md	Switches documented invocations to npx and adds package-manager guidance.
commands/tskl/check.md	Switches documented invocations to npx and adds package-manager guidance.
.changeset/fix-auth-login-command.md	Adds a changeset describing the user-facing command reference updates.

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[Copilot]

Pull request overview

Copilot reviewed 23 out of 23 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (2)

packages/cli/src/help/rules-create.txt:12

• The prerequisites now recommend running via npx @taskless/cli@latest, but the subsequent Usage: and Examples: sections still show taskless rules create ..., which continues to assume a globally-installed taskless binary. Consider updating those usage/examples to use the same runner (or otherwise clarify that taskless is only available when installed globally).

Prerequisites:
  Run `npx @taskless/cli@latest auth login` to authenticate first.
  Your repository must have a GitHub origin remote.

Usage:
  taskless rules create --from <file> [options]

packages/cli/src/help/rules-improve.txt:12

• The prerequisites now recommend running via npx @taskless/cli@latest, but the Usage: and Examples: sections still show taskless rules improve ..., which assumes a globally-installed taskless binary. Consider updating those usage/examples to match the recommended invocation (or explicitly document the difference).

Prerequisites:
  Run `npx @taskless/cli@latest auth login` to authenticate first.
  Your repository must have a GitHub origin remote.

Usage:
  taskless rules improve --from <file> [options]

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