PR Vision v0.2.0: clear CI blockers (P1-A/B/C/D/E + P2 CONTEXT)

P1-A: Remove defined()/constant() declarations from tests/bootstrap.php
  - Both shadow PHP built-ins → 'Cannot redeclare' fatal on PHP 8.x
  - Killed PHP Lint (8.2) job and cancelled 8.1/8.3 jobs
  - Full bootstrap audit: no other PHP built-in shadows remain

P1-B: Re-escape pre-escaped vars at echo site (class-prv-model-manager-table)
  - $prov, $slug, $note: esc_html() at output (was only at assignment)
  - $id: esc_attr() at every output site (3 places)
  - $checked_attr/$toggle_attrs: phpcs:ignore -- hard-coded attribute strings
  - render_health_badge(): phpcs:ignore -- returns pre-escaped HTML markup

P1-C: phpcs:disable/enable NonceVerification.Missing (class-prv-settings-page)
  - Wraps all four handle_*() POST blocks
  - Justification inline: nonce verified via require_admin_nonce() private helper

P1-D/E: Auto-fixable PHPCS violations (array formatting + style)
  - class-prv-config.php: expand 12 inline associative peptide arrays to multi-line
  - class-prv-probe-runner.php: expand inline {probed,errors} array; align param docs
  - class-prv-model-test-ajax.php: multi-line wp_send_json_success/error calls
  - class-prv-settings-renderer.php: extract cadence options array to variable
  - class-prv-model-registry.php: capitalise docblock first word; align param spacing

P2: CONTEXT.md v0.2.0 -- add 7 new domain terms
  - Config Version, Run Lock, Model Registry, Run Health, Projected Cost,
    Config-version Stamp, Truncation State

Agent-Session: pr-vision admin v0.2.0 CI fix

CONTEXT.md

@@ -1,6 +1,6 @@
 # Context — Domain Glossary (PR Vision)
 
-**Version:** 0.1.1 | **Last updated:** 2026-06-13
+**Version:** 0.2.0 | **Last updated:** 2026-06-14
 
 This file is the ubiquitous-language glossary for `pr-vision`. Every term below has a precise meaning within this codebase. AI agents and human contributors should use this terminology consistently.
 
@@ -79,6 +79,41 @@ The extensibility mechanism: `PRV_Data_Collector` produces data; `PRV_Dashboard_
 
 **Code identifiers:** `interface-prv-data-collector.php`, `interface-prv-dashboard-panel.php`, `PRV_Collector_Registry`.
 
+### Config Version
+A monotonically incrementing integer (stored in the `prv_config_versions` option) that is bumped whenever the active probe configuration changes (models list, peptides list, or prompt intents). Each row in `prv_ai_visibility` is stamped with the `config_version` at the time it was recorded. Rows from a different config version are excluded from scoring to ensure comparability.
+
+**Code identifiers:** `PRV_Config_Version`, `bump_version_if_changed()`, `config_version` column, `prv_config_versions` option.
+
+### Run Lock
+A transient-backed mutex (`prv_run_lock`) that prevents concurrent probe runs. Acquired at the start of a run and released in a `finally` block. TTL is 1 hour to self-clear on fatal crash. Both the cron tick and the "Run now" button check `is_locked()` before dispatching.
+
+**Code identifiers:** `PRV_Run_Lock`, `acquire()`, `release()`, `is_locked()`, transient `prv_run_lock`.
+
+### Model Registry
+A versioned option (`prv_models`) storing the list of LLM models to probe. Each entry is a rich object with `{id, provider, slug, enabled, note, health_status, health_probed, health_errors, health_run_id}`. The registry migrates v0.1.x flat-string arrays to v2 schema on upgrade. CRUD is exposed on the Settings page.
+
+**Code identifiers:** `PRV_Model_Registry`, `run_migration_v2()`, `prv_models` option, `PRV_SCHEMA_VERSION` constant.
+
+### Run Health
+A per-model health status derived from the most recent probe run outcomes. Values: `healthy` (probes succeeded), `retired` (zero rows, errors occurred), `disabled` (model not enabled), `unknown` (not yet run). Displayed as a badge in the Model Manager table. Updated by `PRV_Model_Registry::update_health()` at end of each run.
+
+**Code identifiers:** `health_status`, `health_probed`, `health_errors`, `health_run_id` fields; `PRV_Model_Registry::update_health()`; `render_health_badge()`.
+
+### Projected Cost
+The estimated monthly spend (in USD) based on the current configuration: `enabled_models × peptides × intents × $0.005/probe × runs_per_month`. Displayed on the Settings page as a cost inset. The `over_cap` flag is shown with `aria-live="polite"` when the projected cost would exceed the monthly budget.
+
+**Code identifiers:** `PRV_Config::get_projected_cost()`, `per_run_usd`, `per_month_usd`, `probe_count`, `over_cap` return keys.
+
+### Config-version Stamp
+The act of recording the active `config_version` integer on each `prv_ai_visibility` row at insert time. Enables retrospective filtering: only rows with `config_version = active_version` are included in current-period scoring, preventing cross-config score pollution.
+
+**Code identifiers:** `config_version` column in `prv_ai_visibility`, `PRV_Config_Version::get_active_version()`.
+
+### Truncation State
+When the monthly budget cap is reached mid-run, `prv_last_run_truncated` is set to `1`. This surfaces on the Settings page as a notice: "Last run was truncated by the monthly budget cap." The flag is cleared on the next successful full run. Probes after the cap are skipped (not errored) and counted in `skipped_budget`.
+
+**Code identifiers:** `prv_last_run_truncated` option, `PRV_Cost_Ledger::can_afford()`, `skipped_budget` count, `truncated` flag in run counts.
+
 ### GEO
 Generative Engine Optimization — the practice of improving a brand's visibility in AI-generated responses. This plugin is the measurement instrument for peptiderepo.com's GEO program.