feat(ultraplan-local): M0 — profile foundation, no behaviour change

Introduces a profile-loader infrastructure for runtime-instantiable
ultraplan variants (depth × domain × goal axes). M0 ships only the
`default` profile, which mirrors the current hardcoded Phase 5/9 agent
set — so existing flows are unaffected.

What lands:
- profiles/default.yaml — schema v1, lists current 8 exploration agents
  + 2 review agents, captures today's adversarial regime
- scripts/profile-loader.mjs — null-deps Node loader with limited-subset
  YAML parser, listProfiles(), loadProfile(), validateProfile() that
  cross-checks every referenced agent exists in agents/
- scripts/profile-loader.test.mjs — 26 node:test cases (parser, validation,
  loader, integration with built-in default.yaml)
- commands/ultraplan-local.md — Phase 1 gains a "Resolve the profile"
  step (--profile flag → brief.recommended_profile → default fallback)
  and prints profile + source in the mode report. Phase 5/9 unchanged.
- README.md, CLAUDE.md, marketplace README — documentation of the M0
  foundation, the universal-brief design principle, and the M1/M2/M3
  milestones to come.

M1 (next) wires profile recommendation into ultrabrief Phase 4. M2
ships the additional built-in profiles (quick, bugfix, feature, refactor,
security-deep, research-heavy) and replaces the hardcoded Phase 5 agent
table with profile-driven selection. M3 adds user-extensible profiles.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/ultraplan-local/profiles/default.yaml

@@ -0,0 +1,60 @@
+# default.yaml — Bakoverkompatibel baseline profil for ultraplan-local
+#
+# Speiler dagens hardkodete oppførsel. Når ingen profil er valgt eksplisitt
+# eller anbefalt av ultrabrief, faller ultraplan-local tilbake hit. Endring av
+# denne filen endrer dagens oppførsel — gjør det med omhu.
+#
+# Schema-versjon: 1 (Profile Schema v1, dokumentert i README).
+
+name: default
+description: "Bakoverkompatibel baseline — speiler dagens hardkodete oppførsel"
+version: 1
+
+# Aksene profilen sitter på. Brukes av profile-recommender for matching.
+axes:
+  depth: standard
+  domain: general
+  goal: implementation
+
+# Stikkord som signalerer at denne profilen passer. default har ingen —
+# den er fallback når ingenting annet matcher.
+triggers:
+  keywords: []
+  nfr_signals: []
+
+# Hvilke agenter som kjøres i Phase 5 (exploration) og Phase 9 (review).
+# For default-profilen kjører ultraplan-local sin opprinnelige
+# size/conditional-logikk: convention-scanner kun for medium+ codebases,
+# research-scout kun ved ekstern teknologi som ikke dekkes av research-briefer.
+# Custom profiler kjører alle listede agenter uten conditional-filtering.
+agents:
+  exploration:
+    - architecture-mapper
+    - dependency-tracer
+    - risk-assessor
+    - task-finder
+    - test-strategist
+    - git-historian
+    - convention-scanner
+    - research-scout
+  review:
+    - plan-critic
+    - scope-guardian
+
+# Filter for cc-architect-catalog ved /ultra-cc-architect-local.
+# Tom liste = full katalog (dagens oppførsel).
+skills:
+  catalog_filter: []
+  prefer_layer: []
+
+# Adversarial review-regime i Phase 9.
+adversarial:
+  depth: standard
+  iterations: 1
+  blockers_only: false
+
+# Override exploration-sizing fra settings.json. Default speiler verdiene der.
+exploration_sizing:
+  smallCodebaseAgents: 3
+  mediumCodebaseAgents: 5
+  largeCodebaseAgents: 7