fix(tea-plugin): surface a one-time session-cost notice at plugin activation

[gmoncor]

What: Add a one-time, non-blocking stderr notice inside TeaPlugin.validate() stating that enabling tea's six true-by-default settings injects 6 extra agent sessions per story, pointing to docs/tea-plugin-guide.md.

Why: The six cost-affecting settings all default to true with no signal at the moment of activation; the guide documents the cost but an operator who edits policy.toml or toggles the plugin without reading it first gets no in-the-moment warning.

How:

• Add the stderr notice to TeaPlugin.validate(), reusing the existing PluginError/stderr-notice call site.
• Do not change any of the six defaults, this is a visibility fix, not a default change.

Testing: Add a test to tests/test_plugin_tea.py asserting the notice is emitted on validate() when the defaults are in effect, and that the plugin still activates normally.

Changelog: "Added: the TEA plugin now prints a one-time notice at activation about the extra agent sessions its default settings add per story."

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between ddd2bf8 and cbe870d.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/bmad_loop/data/plugins/tea/tea_plugin.py
• tests/test_plugin_tea.py

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