Add annotated-link / definition exception to the em dash rule (#14)

[pfstr]

What

Adds an exception to pattern #14 (em/en dash hard cut) for em dashes that act as a structural separator in an annotated link or definition, rather than a mid-sentence AI tell.

The canonical case is a reference/source list:

[Debian Wiki – SSH](https://wiki.debian.org/SSH) — Debian-specific notes on SSH configuration.

Here the em dash after ](url) separates the linked title from its description. The same shape appears in glossaries and definition lists (**Term** — definition). Under the current hard cut, the skill rewrites ... ) — Debian-specific notes into ... ). Debian-specific notes, which flattens a deliberate formatting convention.

Behavior added

• Detection: an em dash that directly follows a Markdown link ](url) (or a bolded/leading term at the start of a list item) and introduces a descriptive clause for that title.
• Ask once: on the first such separator in a document, the skill asks the user whether to keep these separators as em dashes or convert them like any other em dash, then applies that choice to every matching separator. No per-occurrence re-prompting.
• Embedded mode: cannot ask, so it defaults to keeping these separators (legitimate convention, not a tell).
• The final —/– scan step is updated so the two standing exceptions (voice sample, kept annotated-link separators) no longer contradict the "any hit means the draft isn't done" check.

The exception is scoped narrowly: only the title/term separator is affected; em dashes anywhere else in the prose still follow the existing rule.

Maintenance contract

Per AGENTS.md, bumped the version to 2.10.0 in SKILL.md (metadata.version), .claude-plugin/plugin.json, and the README.md version history, and added a changelog note explaining the fix. No numbered patterns were added, removed, or renumbered (still 33). python3 scripts/validate-package.py passes, and SKILL.md is 425/500 lines.

Why

Reference lists that use the title — description convention are common in technical writing, and having the humanizer silently rewrite the separator is surprising. Asking once preserves author intent without weakening the default em dash cut for real prose tells.