Improve TraceDecay skill adoption steering

[ScriptedAlchemy]

Summary

• consolidate the model-invoked TraceDecay skill catalog into workflow-stage skills for Cursor and Codex
• add a using-tracedecay bootstrap skill and inject it into indexed session context with stronger mandatory steering
• retarget slash dispatchers, embed manifests, analytics fixtures, and tests to the consolidated skill names

Validation

• cargo fmt
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo test --test agent_suite plugin_skill_contract -- --nocapture
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo test --lib embedded -- --nocapture
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo test --lib skills -- --nocapture
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo test --test hooks_lsp_suite build_cursor_session_context -- --nocapture
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo test --test hooks_lsp_suite build_codex_session_context -- --nocapture
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-skill-adoption-2 cargo check
• git diff --check

Note: the first cargo test attempt failed before repo tests because inherited TMPDIR=/scratch/tmp made libsql-ffi's assembler miss a temp file. Rerunning with TMPDIR=/tmp passed.

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