Forge: address publication review feedback

[GolaraJ]

Summary

• bind the published PR marker to the selected proposal
• reject symlinks at every mapped publication destination
• reduce tool page size when a single-session batch cannot split further

Validation

• 74 Repository Skill Forge tests pass
• git diff --check passes

Mirrors the follow-up fixes applied to github/copilot-dreaming-tasks#24.

[Copilot]

Pull request overview

This PR updates the Repository Skill Forge workflow to make publication metadata deterministic per selected proposal, harden/clarify publication guidance around marker storage, and improve extraction retry behavior when tool batches cannot be split further.

Changes:

• Emit selection.marker directly from the selected proposal during proposal-ledger.py select, and validate it in the stateless forge tests.
• When a tools batch failure occurs and it cannot be split (single session), fall back to reducing the page size (with a new regression test).
• Update Skill/prompt documentation to store markers per-proposal and to require using the selected proposal’s marker for PR publication.

Show a summary per file

File	Description
plugins/repo-dreamer/skills/repository-skill-forge/tests/test_stateless_forge.py	Adds an assertion that selection.marker matches the selected proposal’s rendered marker.
plugins/repo-dreamer/skills/repository-skill-forge/tests/test_extraction_controller.py	Adds a regression test ensuring single-session tool failures reduce pageSize instead of only attempting splits.
plugins/repo-dreamer/skills/repository-skill-forge/SKILL.md	Updates guidance to store markers per proposal directory and to use selection.marker for publication.
plugins/repo-dreamer/skills/repository-skill-forge/scripts/proposal-ledger.py	Extends select() output so the chosen selection includes marker derived from the selected proposal.
plugins/repo-dreamer/skills/repository-skill-forge/scripts/extraction-controller.py	Adjusts failure recovery so tools batches attempt split_tool_batch() and otherwise fall back to split_batch() (page size reduction).
plugins/repo-dreamer/skills/repository-skill-forge/prompts/author-proposal.md	Aligns authoring/publication instructions with the per-proposal marker storage + selection.marker usage.

Review details

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• Files reviewed: 6/6 changed files
• Comments generated: 0
• Review effort level: Lite