Add official US and European collection and calendar storage

Collect official RSS and Atom summaries, preserve historical captures, and poll macro releases with bounded cadence and Retry-After handling. Separate news collectors from the economic calendar worker.

Track statistical periods, publication stages, first observations, revisions, and current official series. Include explicit migration files and isolated archive, parsing, and import tests; no migration or import is executed by this commit.

Keep dependency declarations and lockfile together for PDF archives and the upcoming captcha integration. Verify the staged snapshot with 90 focused tests.

backend/tests/fixtures/calendar/pce.html

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+<html><body><div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><p><a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*kvcm30*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTQ5MTg5MzIkbzg0JGcxJHQxNzU0OTIyMTUyJGo1NiRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI3NiJdXX0="><strong>Personal income</strong> increased $66.6 billion </a>(0.2 percent at a monthly rate) in August, according to estimates released today by the U.S. Bureau of Economic Analysis (BEA). <strong>Disposable personal income (DPI)</strong>—personal income less personal current taxes—increased $68.6 billion (0.3 percent), and <strong>personal consumption expenditures (PCE)</strong> increased $190.8 billion (0.9 percent).</p><div class="center_div"><a href="/system/files/pi0826chart1.png"><img style="padding:0px 50px;" src="/system/files/pi0826chart1.png" data-entity-type="file" alt="Disposable Personal Income, Outlays, and Saving" width="1167" height="588" class="align-center"></a></div><p><strong>Personal outlays</strong>—the sum of PCE, personal interest payments, and personal current transfer payments—increased $190.7 billion in August. <strong>Personal saving</strong> was $990.2 billion, and the <strong>personal saving rate</strong>—personal saving as a percentage of DPI—was 4.1 percent.</p><p>The increase in <strong>current-dollar personal income</strong> in August primarily reflected increases in compensation and government social benefits.</p><p>The <a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*kvcm30*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTQ5MTg5MzIkbzg0JGcxJHQxNzU0OTIyMTUyJGo1NiRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI4MiJdXX0=">$190.8 billion increase in<strong> current-dollar PCE</strong></a> in August reflected increases of $114.1 billion in spending on goods and $76.7 billion in spending on services.</p><p> </p><div class="center_div"><a href="/system/files/pi0826chart2.png"><img style="padding:0px 125px;" src="/system/files/pi0826chart2.png" data-entity-type="file" alt="Changes in Monthly Consumer Spending August 2026" width="974" height="816" class="align-center"></a></div><p><a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*kvcm30*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTQ5MTg5MzIkbzg0JGcxJHQxNzU0OTIyMTUyJGo1NiRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI4MyJdXX0="><strong>Real PCE</strong> increased $92.8 billion</a> (<a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*kvcm30*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTQ5MTg5MzIkbzg0JGcxJHQxNzU0OTIyMTUyJGo1NiRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI3OSJdXX0=">0.6 percent</a> at a monthly rate) in August.</p><p><a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*1p5v1ex*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTUwOTMyMTUkbzg5JGcxJHQxNzU1MDkzMjE4JGo1NyRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI4NCJdXX0=">From the preceding month, the<strong> PCE price index</strong> for August increased 0.3 percent</a>. Excluding food and energy, the PCE price index increased 0.2 percent.</p><p><a href="https://apps.bea.gov/iTable/?reqid=19&amp;step=2&amp;isuri=1&amp;categories=survey&amp;_gl=1*1p5v1ex*_ga*MjA4Njg2MTcyMS4xNzQ4MzU1NTcy*_ga_J4698JNNFT*czE3NTUwOTMyMTUkbzg5JGcxJHQxNzU1MDkzMjE4JGo1NyRsMCRoMA..#eyJhcHBpZCI6MTksInN0ZXBzIjpbMSwyLDNdLCJkYXRhIjpbWyJjYXRlZ29yaWVzIiwiU3VydmV5Il0sWyJOSVBBX1RhYmxlX0xpc3QiLCI0MjQiXV19">From the same month one year ago, the<strong> PCE price index</strong> for August increased 3.4 percent</a>. Excluding food and energy, the PCE price index increased 3.0 percent from one year ago.</p><div class="center_div"><a href="/system/files/pi0826chart3.png"><img style="padding:0px 125px;" src="/system/files/pi0826chart3.png" data-entity-type="file" alt="PCE Price Indexes, Percent Change From Month One Year Ago" width="1007" height="786" class="align-center"></a></div><div class="table-responsive"><table class="table table-md"><thead><tr><th class="text-center" colspan="5"><strong>Personal Income and Related Measures</strong><br><text class="text-center text-muted" colspan="5"><small>[Percent change from preceding month]</small></text></th></tr></thead><tbody><tr><td class="text-left"> </td><td class="text-right" style="text-align:right;">July</td><td class="text-right" style="text-align:right;">August</td></tr><tr><td class="text-left">CuLine truncated