chore: alter doctor output

[goodroot]

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[github-actions]

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Summary

This is a README-only change that updates sample/status output from session state: active to a concrete session-file presence string. No direct code, test, or security changes are visible from the provided diff. The main risk is documentation drift: this wording may blur the distinction between a merely present local session file and an actually active/linked session, which matters for opub session-linking semantics.

Findings

• The new example may weaken session-state semantics. session state: active communicated runtime state, while session state: present (.../session.json) communicates filesystem presence. For opub, a present session file is not equivalent to an active linked session; docs should avoid implying that local state-file existence proves an active or linked run.
• The example now exposes a more specific local state path shape (~/.local/state/opub/repos/.../targets/codex/session.json). While not a secret, documenting internal path structure can ossify implementation details and may encourage consumers to depend on a path instead of supported status fields/APIs.
• No tests are shown for this behavioral/documentation shift. If CLI output was intentionally changed, there should be coverage ensuring session reporting preserves the invariant between configured/present state and active/linked state.

Suggested follow-ups

• Clarify in the README whether present means only that a local session file exists, and explicitly state that it does not imply an active or linked funded-work session.
• If the CLI output changed, add/update tests for session-state reporting to distinguish at least: absent, present, active, and linked states where applicable.
• Consider using a less implementation-specific placeholder in docs if the exact on-disk path is not part of the supported interface.

[goodroot]

Err... hah! Ok, CI talked me out of it.