feat(campaigns): add the campaign template

A campaign holds only play state and names its game in frontmatter;
new-campaign copies this template.

campaigns/_template/campaign.md

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+---
+name: {{name}}
+game: {{game}}
+created: {{date}}
+---
+
+# {{name}}
+
+## Premise
+
+One or two sentences describing the situation the PC starts in.
+
+## Tone & themes
+
+What kind of story this is — genre, mood, and the questions it explores.
+
+## Boundaries
+
+Lines and veils, and anything that should stay off the table.
+
+## Starting situation
+
+Where the PC is and what is already in motion when Session 0001 opens.

campaigns/_template/characters/_template.md

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+---
+name: 
+game: 
+stats: {}
+tracks: {}
+conditions: []
+inventory: []
+---
+
+# 
+
+## Description
+
+## Background
+
+## Relationships
+
+## Notes

campaigns/_template/house-rules.md

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+# House rules
+
+This campaign's overrides and additions to the game's rules. The game package
+is authoritative; anything written here takes precedence for this campaign
+only. Leave it empty if the game runs as written.

campaigns/_template/sessions/README.md

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+# Sessions
+
+One file per session, named `NNNN-slug.md` (zero-padded, e.g. `0001-the-ash-gate.md`).
+Session logs are append-only; see `AGENTS.md` for the format.

campaigns/_template/state/clocks.md

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+# Clocks
+
+Ticking pressures. Fill a segment whenever the fiction advances the clock.
+
+| Clock | Segments | Filled | Notes |
+|-------|----------|--------|-------|
+|       |          |        |       |

campaigns/_template/state/threads.md

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+# Threads
+
+Open questions and unresolved goals. Status is one of: open, resolved, abandoned.
+
+| Thread | Status | Notes |
+|--------|--------|-------|
+|        |        |       |

campaigns/_template/tables/README.md

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+# Campaign tables
+
+Tables placed here belong to this campaign and override the game's tables when
+names collide. The lookup order for `journal roll <name>` is:
+
+1. `campaigns/<name>/tables/<name>.csv`
+2. `games/<game>/tables/<name>.csv`
+
+Use this directory for tables specific to this campaign's setting or cast. The
+game's own tables do not need to be copied here.
+
+Format: a CSV with a `min,max,text` header and an optional `tags` column. See
+`docs/oracle.md`.

campaigns/_template/world/factions/README.md

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+# Factions
+
+One file per faction, named `kebab-case.md`.
+
+```markdown
+---
+name: 
+goal: 
+disposition: friendly | neutral | hostile | unknown
+---
+
+# <name>
+
+## Description
+
+## Members
+
+## Resources
+
+## History
+```

campaigns/_template/world/locations/README.md

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+# Locations
+
+One file per location, named `kebab-case.md`. Keep the frontmatter stable so
+the agent can update it in place.
+
+```markdown
+---
+name: 
+type: 
+region: 
+status: visited | known | rumored
+---
+
+# <name>
+
+## Description
+
+## Notable features
+
+## Inhabitants
+
+## History
+```

campaigns/_template/world/npcs/README.md

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+# NPCs
+
+One file per NPC, named `kebab-case.md`.
+
+```markdown
+---
+name: 
+role: 
+location: 
+status: alive | dead | missing | unknown
+disposition: friendly | neutral | hostile | unknown
+---
+
+# <name>
+
+## Description
+
+## Wants
+
+## Relationships
+
+## History
+```