fix(game): profile ships mechanisms, demo defaults move to examples

[prakashUXtech]

The game profile used to ship with a specific character baked in. GrudgeKernel.birth() defaulted to Bjorn the Butcher, the templated dialogue engine spoke Bjorn's lines for every NPC, the LLM prompt ignored the persona it was handed and hardcoded a butcher, GameWorld put everyone in a "tavern", and CostMeter carried a table of vendor rates. That is demo content living in a library.

What changed

GrudgeKernel.birth(name, archetype, ...) requires both arguments. persona now defaults to "I am <name>, <archetype>." for both birth() and awaken().

DialogueEngine.speak() takes npc_name. The templated lines are name-aware and trade-neutral, the same treatment speak_reputation() already had. LLMDialogueEngine.build_prompt() builds from persona and npc_name. This is the one real bug fix in here: before, Astrid the innkeeper was prompted as Bjorn the butcher whenever the LLM engine was on.

PRICING is an empty dict. CostMeter(generate, model, pricing=None) reads a caller-supplied {model: (in_rate, out_rate)} table, or the module-level dict if you populate it at startup. An unconfigured meter raises unknown model. I kept the exported name so existing imports resolve.

DEFAULT_ZONE is "start", and GameWorld takes start_zone.

Everything removed lands in examples/game/: the Bjorn constants, ButcherDialogueEngine with his original lines, birth_bjorn(), TAVERN, and the sample rate table. Both demos (npc_soul_grudge, butcher_remembers) import from there; they insert the repo root on sys.path so they still run as scripts and still load by path from test_demo_server.py.

Breaking

Four surfaces for anyone importing soul_protocol.profiles.game directly: the required birth() arguments, the speak() keyword (custom engines must accept it), CostMeter needing a pricing table, and the DEFAULT_ZONE value. All listed in the CHANGELOG.

Verification

Full suite on Python 3.12: 3264 passed, 3 skipped, no new failures. Ruff check and format clean. tests/profiles/game/test_demo_server.py exercises the relocated demo module through the real server.

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Issues (must fix)

• No linked issue found. PRs should reference an issue (Fixes #123).
• No evidence of local testing found. Please include terminal output or screenshots.

Please update your PR to address these points.

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